Corrosion tests in artificial atmospheres - Salt spray tests (ISO 9227:2017)

This document specifies the apparatus, the reagents and the procedure to be used in conducting the
neutral salt spray (NSS), acetic acid salt spray (AASS) and copper-accelerated acetic acid salt spray
(CASS) tests for assessment of the corrosion resistance of metallic materials, with or without permanent
or temporary corrosion protection.
It also describes the method employed to evaluate the corrosivity of the test cabinet environment.
It does not specify the dimensions or types of test specimens, the exposure period to be used for a
particular product, or the interpretation of results. Such details are provided in the appropriate product
specifications.
The salt spray tests are particularly useful for detecting discontinuities, such as pores and other defects,
in certain metallic, organic, anodic oxide and conversion coatings.
The neutral salt spray (NSS) test particularly applies to
— metals and their alloys,
— metallic coatings (anodic and cathodic),
— conversion coatings,
— anodic oxide coatings, and
— organic coatings on metallic materials.
The acetic acid salt spray (AASS) test is especially useful for testing decorative coatings of copper +
nickel + chromium, or nickel + chromium. It has also been found suitable for testing anodic and organic
coatings on aluminium.
The copper-accelerated acetic acid salt spray (CASS) test is useful for testing decorative coatings of
copper + nickel + chromium, or nickel + chromium. It has also been found suitable for testing anodic
and organic coatings on aluminium.
The salt spray methods are all suitable for checking that the quality of a metallic material, with or
without corrosion protection, is maintained. They are not intended to be used for comparative testing
as a means of ranking different materials relative to each other with respect to corrosion resistance or
as means of predicting long-term corrosion resistance of the tested material.

Korrosionsprüfungen in künstlichen Atmosphären - Salzsprühnebelprüfungen (ISO 9227:2017)

Diese Internationale Norm legt das Gerät, die Reagenzien und das anzuwendende Verfahren bei der Durchführung der neutralen Salzsprühnebelprüfung (NSS, en: neutral salt spray), der Essigsäure-Salzsprühnebelprüfung (AASS, en: acetic acid salt spray) und der kupferbeschleunigten Essigsäure-Salzsprühnebelprüfung (CASS, en: copper-accelerated acid salt spray) zum Beurteilen der Korrosions-beständigkeit von metallischen Materialien mit oder ohne ständigen Korrosionsschutz oder mit temporärem Korrosionsschutz fest.
Die Internationale Norm beschreibt auch das Verfahren, welches angewendet wird, um die Korrosivität in der Prüfkammer zu bewerten.
Die Internationale Norm legt nicht die Maße oder Arten der Prüfproben, die für ein bestimmtes Produkt anzuwendende Dauer der Beanspruchung oder die Auswertung der Ergebnisse fest. Solche Einzelheiten werden in den entsprechenden Produktspezifikationen angegeben.
Die Salzsprühnebelprüfungen sind besonders nützlich zum Nachweis von Schwachstellen, wie Poren und anderen Schäden, in bestimmten metallischen Überzügen und organischen Beschichtungen sowie anodischen Oxidschichten und Umwandlungsschichten.
Die neutrale Salzsprühnebelprüfung (NSS) ist das Prüfverfahren, bei dem eine 5%ige Natriumchloridlösung in einer kontrollierten Umgebung versprüht wird. Sie ist anwendbar insbesondere für:
   Metalle und deren Legierungen;
   (anodisch oder kathodisch wirksame) Metallüberzüge;
   Umwandlungsschichten;
   anodische Oxidschichten; und
   organische Beschichtungen auf metallischen Materialien.
Die Essigsäure-Salzsprühnebelprüfung (AASS) ist das Prüfverfahren, bei dem eine 5%ige Natriumchloridlösung, der Eisessig zugesetzt wurde, in kontrollierter Umgebung versprüht wird. Sie ist besonders nützlich zum Prüfen dekorativer Überzüge aus Kupfer + Nickel + Chrom oder Nickel + Chrom. Sie wurde auch zum Prüfen anodischer und organischer Schichten auf Aluminium als geeignet befunden.
Die kupferbeschleunigte Essigsäure-Salzsprühnebelprüfung (CASS) ist das Prüfverfahren, bei dem eine 5%ige Natriumchloridlösung, der Kupferchlorid und Eisessig zugesetzt wurde, in einer kontrollierten Umgebung versprüht wird. Sie ist nützlich zum Prüfen dekorativer Überzüge aus Kupfer  Nickel  Chrom oder Nickel  Chrom. Sie wurde auch zum Prüfen anodischer und organischer  Schichten auf Aluminium als geeignet befunden.
Die Salzsprühnebelverfahren sind alle geeignet zum vergleichenden Prüfen, ob die Qualität eines metallischen Materials, mit oder ohne Korrosionsschutz, erhalten bleibt. Sie sind nicht als Vergleichsprüfung gedacht, um unterschiedliche Materialien nach ihrer Korrosionsbeständigkeit einzustufen oder um die Langzeitkorrosionsbeständigkeit des geprüften Materials vorher¬zusagen.

Essais de corrosion en atmosphères artificielles - Essais aux brouillards salins (ISO 9227:2017)

ISO 9227:2017 spécifie l'appareillage, les réactifs et le mode opératoire à utiliser lors de la réalisation des essais au brouillard salin neutre (NSS), au brouillard salin acétique (AASS) et au brouillard salin cupro-acétique (CASS) destinés à évaluer la résistance à la corrosion de matériaux métalliques, avec ou sans revêtement de protection contre la corrosion, temporaire ou permanent.
Elle décrit également la méthode à appliquer pour évaluer la corrosivité du milieu de la chambre d'essai.
Elle ne spécifie pas les dimensions ou types des éprouvettes d'essai, le temps durant lequel exposer un produit particulier ni l'interprétation des résultats. Ces détails sont fournis dans les spécifications des produits correspondantes.
Les essais au brouillard salin sont particulièrement utiles pour détecter les discontinuités du type pores ou autres défauts de certains revêtements métalliques, organiques, d'oxydes anodiques ou de couches de conversion.
L'essai au brouillard salin neutre (NSS) s'applique particulièrement:
- aux métaux et à leurs alliages,
- aux revêtements métalliques (anodiques et cathodiques),
- aux couches de conversion,
- aux revêtements d'oxydes anodiques et
- aux revêtements organiques sur matériaux métalliques.
L'essai au brouillard salin acétique (AASS) est particulièrement utile pour évaluer les revêtements décoratifs de cuivre + nickel + chrome ou de nickel + chrome. Il s'est également révélé utile pour évaluer des revêtements anodiques et organiques sur l'aluminium.
L'essai au brouillard salin cupro-acétique (CASS) est utile pour évaluer les revêtements décoratifs de cuivre + nickel + chrome ou de nickel + chrome. Il s'est également révélé utile pour évaluer des revêtements anodiques et organiques sur l'aluminium.
Les méthodes au brouillard salin conviennent toutes pour vérifier que la qualité d'un matériau métallique, avec ou sans revêtement protecteur contre la corrosion, est maintenue. Il n'est pas recommandé de les utiliser pour des essais comparatifs en vue de classer les différents matériaux les uns par rapport aux autres vis-à-vis de la résistance à la corrosion ou comme moyen de prédire la résistance à la corrosion à long terme du matériau soumis à essai.

Korozijski preskusi v umetnih atmosferah - Korozijski preskusi v slani komori (ISO 9227:2017)

Ta dokument določa naprave, reagente in postopek, namenjene za izvajanje preskusov z nevtralno slano meglico (NSS), slano meglico z ocetno kislino (AASS) in preskusov s slano meglico z ocetno kislino, pospešenih z bakrom (CASS) za oceno korozijske odpornosti kovinskih materialov s trajno
ali začasno protikorozijsko zaščito ali brez nje.
Opisuje tudi metodo za vrednotenje korozivnosti v okolju preskusne komore. Ne določa dimenzij ali vrst preskušancev, časa izpostavljenosti za določen proizvod ali razlage rezultatov. Te podrobnosti so navedene v ustreznih specifikacijah proizvodov.
Preskusi s slano meglico so še posebej uporabni za zaznavanje nepravilnosti, kot so pore in druge napake v določenih kovinskih, organskih, anodno oksidnih in reakcijskih prevlekah.
Preskus z nevtralno slano meglico (NSS) se uporablja zlasti za
– kovine in njihove zlitine,
– kovinske prevleke (anodne in katodne),
– reakcijske prevleke,
– anodno oksidne prevleke in
– organske prevleke na kovinskih materialih.
Preskus s slano meglico z ocetno kislino (AASS) je posebno uporaben za preskušanje dekorativnih prevlek z bakrom + nikljem + kromom ali kromnikljem. Ugotovljeno je bilo tudi, da je primeren za preskušanje anodnih in organskih
prevlek na aluminiju.
Preskus s slano meglico z ocetno kislino, pospešen z bakrom (CASS), je uporaben za preskušanje dekorativnih prevlek z bakrom + nikljem + kromom ali kromnikljem. Ugotovljeno je bilo tudi, da je primeren za preskušanje anodnih in organskih prevlek na aluminiju.
Vse metode s slano meglico so ustrezne za preverjanje vzdrževanja kakovosti kovinskih materialov s protikorozijsko zaščito ali brez nje. Niso namenjene za uporabo pri primerjalnih preskusih kot sredstvo za razvrščanje različnih materialov glede na odpornost proti koroziji ali
kot sredstvo za predvidevanje dolgoročne odpornosti preskusnih materialov proti koroziji.

General Information

Status
Published
Public Enquiry End Date
09-Nov-2015
Publication Date
17-May-2017
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
20-Apr-2017
Due Date
25-Jun-2017
Completion Date
18-May-2017

RELATIONS

Buy Standard

Standard
SIST EN ISO 9227:2017
English language
27 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 9227:2017
01-junij-2017
1DGRPHãþD
SIST EN ISO 9227:2012

Korozijski preskusi v umetnih atmosferah - Korozijski preskusi v slani komori (ISO

9227:2017)
Corrosion tests in artificial atmospheres - Salt spray tests (ISO 9227:2017)
Korrosionsprüfungen in künstlichen Atmosphären - Salzsprühnebelprüfungen (ISO
9227:2017)

Essais de corrosion en atmosphères artificielles - Essais aux brouillards salins (ISO

9227:2017)
Ta slovenski standard je istoveten z: EN ISO 9227:2017
ICS:
77.060 Korozija kovin Corrosion of metals
SIST EN ISO 9227:2017 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 9227:2017
---------------------- Page: 2 ----------------------
SIST EN ISO 9227:2017
EN ISO 9227
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2017
EUROPÄISCHE NORM
ICS 77.060 Supersedes EN ISO 9227:2012
English Version
Corrosion tests in artificial atmospheres - Salt spray tests
(ISO 9227:2017)

Essais de corrosion en atmosphères artificielles - Korrosionsprüfungen in künstlichen Atmosphären -

Essais aux brouillards salins (ISO 9227:2017) Salzsprühnebelprüfungen (ISO 9227:2017)

This European Standard was approved by CEN on 28 February 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9227:2017 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 9227:2017
EN ISO 9227:2017 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 9227:2017
EN ISO 9227:2017 (E)
European foreword

This document (EN ISO 9227:2017) has been prepared by Technical Committee ISO/TC 156”Corrosion

of metals and alloys” in collaboration with Technical Committee CEN/TC 262 “Metallic and other

inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys” the

secretariat of which is held by BSI.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by October 2017, and conflicting national standards shall

be withdrawn at the latest by October 2017.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.
This document supersedes EN ISO 9227:2012.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 9227:2017 has been approved by CEN as EN ISO 9227:2017 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 9227:2017
---------------------- Page: 6 ----------------------
SIST EN ISO 9227:2017
INTERNATIONAL ISO
STANDARD 9227
Fourth edition
2017-03
Corrosion tests in artificial
atmospheres — Salt spray tests
Essais de corrosion en atmosphères artificielles — Essais aux
brouillards salins
Reference number
ISO 9227:2017(E)
ISO 2017
---------------------- Page: 7 ----------------------
SIST EN ISO 9227:2017
ISO 9227:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 9227:2017
ISO 9227:2017(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Principle ........................................................................................................................................................................................................................ 3

5 Test solutions ........................................................................................................................................................................................................... 3

5.1 Preparation of the sodium chloride solution ................................................................................................................ 3

5.2 pH adjustment ......................................................................................................................................................................................... 3

5.2.1 pH of the salt solution ................................................................................................................................................. 3

5.2.2 Neutral salt spray (NSS) test .................................................................................................................................. 3

5.2.3 Acetic acid salt spray (AASS) test ...................................................................................................................... 3

5.2.4 Copper-accelerated acetic acid salt spray (CASS) test .................................................................... 4

5.3 Filtration ....................................................................................................................................................................................................... 4

6 Apparatus ..................................................................................................................................................................................................................... 4

6.1 Component protection ..................................................................................................................................................................... 4

6.2 Spray cabinet ............................................................................................................................................................................................ 4

6.3 Heater and temperature control .............................................................................................................................................. 4

6.4 Spraying device ....................................................................................................................................................................................... 4

6.5 Collecting devices ................................................................................................................................................................................. 5

6.6 Re-use ............................................................................................................................................................................................................. 5

7 Method for evaluating cabinet corrosivity ................................................................................................................................ 6

7.1 General ........................................................................................................................................................................................................... 6

7.2 Reference specimens ......................................................................................................................................................................... 6

7.3 Arrangement of the reference specimens........................................................................................................................ 6

7.4 Determination of mass loss (mass per area) ................................................................................................................ 7

7.5 Satisfactory performance of cabinet .................................................................................................................................... 7

8 Test specimens........................................................................................................................................................................................................ 7

9 Arrangement of the test specimens .................................................................................................................................................. 8

10 Operating conditions ....................................................................................................................................................................................... 8

11 Duration of tests .................................................................................................................................................................................................... 9

12 Treatment of test specimens after test .......................................................................................................................................... 9

12.1 General ........................................................................................................................................................................................................... 9

12.2 Non-organic coated test specimens: metallic and/or inorganic coated ................................................ 9

12.3 Organic coated test specimens .................................................................................................................................................. 9

12.3.1 Scribed organic coated test specimens ......................................................................................................... 9

12.3.2 Organic coated but not scribed test specimens ..................................................................................10

13 Evaluation of results ......................................................................................................................................................................................10

14 Test report ................................................................................................................................................................................................................10

Annex A (informative) Example schematic diagram of one possible design of spray cabinet

with means for optional treating fog exhaust and drain .........................................................................................12

Annex B (informative) Complementary method for evaluating cabinet corrosivity using

zinc reference specimens .........................................................................................................................................................................14

Annex C (normative) Preparation of specimens with organic coatings for testing ..........................................16

Annex D (normative) Required supplementary information for testing test specimens with

organic coatings .................................................................................................................................................................................................17

© ISO 2017 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 9227:2017
ISO 9227:2017(E)

Bibliography .............................................................................................................................................................................................................................18

iv © ISO 2017 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 9227:2017
ISO 9227:2017(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO’s adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: w w w . i s o .org/ iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.

This fourth edition cancels and replaces the third edition (ISO 9227:2012), which has been technically

revised. The main technical changes are as follows:

— new definitions for reference material, reference specimen, test specimen and substitute specimen

have been implemented;
— checking of the test apparatus during test operation has been made possible;
— Clause 4 has been added, with some of its text moved from the scope;
— Clause 7 has been summarized.
© ISO 2017 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 9227:2017
ISO 9227:2017(E)
Introduction

There is seldom a direct relation between resistance to the action of salt spray and resistance to

corrosion in other media, because several factors influencing the progress of corrosion, such as the

formation of protective films, vary greatly with the conditions encountered. Therefore, the test results

should not be regarded as a direct guide to the corrosion resistance of the tested metallic materials in

all environments where these materials might be used. Also, the performance of different materials

during the test should not be taken as a direct guide to the corrosion resistance of these materials in

service.

Nevertheless, the method described gives a means of checking that the comparative quality of a metallic

material, with or without corrosion protection, is maintained.

Different metallic substrates (metals) cannot be tested in direct comparison in accordance to their

corrosion resistances in salt spray tests. Comparative testing is only applicable for the same kind of

substrate.

Salt spray tests are generally suitable as corrosion protection tests for rapid analysis for discontinuities,

pores and damage in organic and inorganic coatings. In addition, for quality control purposes,

comparison can be made between specimens coated with the same coating. As comparative tests,

however, salt spray tests are only suitable if the coatings are sufficiently similar in nature.

It is often not possible to use results gained from salt spray testing as a comparative guide to the

long-term behaviour of different coating systems, since the corrosion stress during these tests differs

significantly from the corrosion stresses encountered in practice.
vi © ISO 2017 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 9227:2017
INTERNATIONAL STANDARD ISO 9227:2017(E)
Corrosion tests in artificial atmospheres — Salt spray tests
1 Scope

This document specifies the apparatus, the reagents and the procedure to be used in conducting the

neutral salt spray (NSS), acetic acid salt spray (AASS) and copper-accelerated acetic acid salt spray

(CASS) tests for assessment of the corrosion resistance of metallic materials, with or without permanent

or temporary corrosion protection.

It also describes the method employed to evaluate the corrosivity of the test cabinet environment.

It does not specify the dimensions or types of test specimens, the exposure period to be used for a

particular product, or the interpretation of results. Such details are provided in the appropriate product

specifications.

The salt spray tests are particularly useful for detecting discontinuities, such as pores and other defects,

in certain metallic, organic, anodic oxide and conversion coatings.
The neutral salt spray (NSS) test particularly applies to
— metals and their alloys,
— metallic coatings (anodic and cathodic),
— conversion coatings,
— anodic oxide coatings, and
— organic coatings on metallic materials.

The acetic acid salt spray (AASS) test is especially useful for testing decorative coatings of copper +

nickel + chromium, or nickel + chromium. It has also been found suitable for testing anodic and organic

coatings on aluminium.

The copper-accelerated acetic acid salt spray (CASS) test is useful for testing decorative coatings of

copper + nickel + chromium, or nickel + chromium. It has also been found suitable for testing anodic

and organic coatings on aluminium.

The salt spray methods are all suitable for checking that the quality of a metallic material, with or

without corrosion protection, is maintained. They are not intended to be used for comparative testing

as a means of ranking different materials relative to each other with respect to corrosion resistance or

as means of predicting long-term corrosion resistance of the tested material.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 1514, Paints and varnishes — Standard panels for testing
ISO 2808, Paints and varnishes — Determination of film thickness
ISO 3574, Cold-reduced carbon steel sheet of commercial and drawing qualities

ISO 4623-2:2016, Paints and varnishes — Determination of resistance to filiform corrosion — Part 2:

Aluminium substrates
© ISO 2017 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 9227:2017
ISO 9227:2017(E)

ISO 4628-1, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity

and size of defects, and of intensity of uniform changes in appearance — Part 1: General introduction and

designation system

ISO 4628-2, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity

and size of defects, and of intensity of uniform changes in appearance — Part 2: Assessment of degree of

blistering

ISO 4628-3, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and

size of defects, and of intensity of uniform changes in appearance — Part 3: Assessment of degree of rusting

ISO 4628-4, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity

and size of defects, and of intensity of uniform changes in appearance — Part 4: Assessment of degree of

cracking

ISO 4628-5, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and

size of defects, and of intensity of uniform changes in appearance — Part 5: Assessment of degree of flaking

ISO 4628-8, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity

and size of defects, and of intensity of uniform changes in appearance — Part 8: Assessment of degree of

delamination and corrosion around a scribe or other artificial defect
ISO 8044, Corrosion of metals and alloys — Basic terms and definitions

ISO 8407, Corrosion of metals and alloys — Removal of corrosion products from corrosion test specimens

ISO 8993, Anodizing of aluminium and its alloys — Rating system for the evaluation of pitting corrosion —

Chart method

ISO 10289, Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates —

Rating of test specimens and manufactured articles subjected to corrosion tests

ISO 17872, Paints and varnishes — Guidelines for the introduction of scribe marks through coatings on

metallic panels for corrosion testing
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 8044 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1
reference material
material with known test performance
3.2
reference specimen

portion of the reference material (3.1) that is to be exposed with the intention to check the reproducibility

and repeatability of the test results for the test cabinet in use
3.3
test specimen
specific portion of the samples upon which the testing is to be performed
3.4
substitute specimen

specimen made of inert materials (such as plastic or glass) used for the substitute of a test specimen (3.3)

2 © ISO 2017 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 9227:2017
ISO 9227:2017(E)
4 Principle

The neutral salt spray (NSS) test is the test method in which a neutral 5 % sodium chloride solution is

atomized under a controlled environment.

The acetic acid salt spray (AASS) test is the test method in which an acidified 5 % sodium chloride

solution with the addition of glacial acetic acid is atomized under a controlled environment.

The copper-accelerated acetic acid salt spray (CASS) test is the test method in which an acidified 5 %

sodium chloride solution with the addition of copper chloride and glacial acetic acid is atomized under

a controlled environment.
5 Test solutions
5.1 Preparation of the sodium chloride solution

Dissolve a sufficient mass of sodium chloride in distilled or deionized water with a conductivity not

higher than 20 µS/cm at 25 °C ± 2 °C to produce a concentration of 50 g/l ± 5 g/l. The sodium chloride

concentration of the sprayed solution collected shall be 50 g/l ± 5 g/l. The specific gravity range for a

50 g/l ± 5 g/l solution is 1,029 to 1,036 at 25 °C.

The sodium chloride shall not contain a mass fraction of the heavy metals copper (Cu), nickel (Ni) and

lead (Pb) in total more than 0,005 %. It shall not contain a mass fraction of sodium iodide more than

0,1 % and a mass fraction of total impurities more than 0,5 %, calculated for dry salt.

NOTE Sodium chloride with anti-caking agents can act as corrosion inhibitors or accelerators. A useful

sodium chloride salt grade is a grade named Ph. Eur/USP or JIS, ACS.
5.2 pH adjustment
5.2.1 pH of the salt solution

Adjust the pH of the salt solution to the desired value on the basis of the pH of the sprayed solution

collected.
5.2.2 Neutral salt spray (NSS) test

Adjust the pH of the salt solution (5.1) so that the pH of the sprayed solution collected within the test

cabinet (6.2) is 6,5 to 7,2 at 25 °C ± 2 °C. Check the pH using electrometric measurement. Measurements

of pH shall be done using electrodes suitable for measuring in weakly buffered sodium chloride solutions

in deionized water. Make any necessary corrections by adding hydrochloric acid, sodium hydroxide or

sodium bicarbonate solution of analytical grade.

NOTE Possible changes in pH can result from loss of carbon dioxide in the solution when it is sprayed. Such

changes can be avoided by reducing the carbon dioxide content of the solution by, for example, heating it to a

temperature above 35 °C before it is placed in the apparatus, or by making the solution using freshly boiled water.

5.2.3 Acetic acid salt spray (AASS) test

Add a sufficient amount of glacial acetic acid to the salt solution (5.1) to ensure that the pH of samples of

sprayed solution collected in the test cabinet (6.2) is between 3,1 and 3,3 at 25 °C ± 2 °C. If the pH of the

solution initially prepared is 3,0 to 3,1, the pH of the sprayed solution is likely to be within the specified

limits. Check the pH using electrometric measurement. Measurements of pH shall be done using

electrodes suitable for measuring in weakly buffered sodium chloride solutions in deionized water.

Make any necessary corrections by adding glacial acetic acid, sodium hydroxide, or sodium bicarbonate

of analytical grade.
© ISO 2017 – All rights reserved 3
---------------------- Page: 15 ----------------------
SIST EN ISO 9227:2017
ISO 9227:2017(E)
5.2.4 Copper-accelerated acetic acid salt spray (CASS) test

Dissolve a sufficient mass of copper(II) chloride dihydrate (CuCl ⋅2H O) in the salt solution (5.1) to

2 2

produce a concentration of 0,26 g/l ± 0,02 g/l [equivalent to (0,205 ± 0,015) g of CuCl per litre].

Adjust the pH using the procedures described in 5.2.3.
5.3 Filtration

If necessary, filter the solution before placing it in the reservoir of the apparatus, to remove any solid

matter which might block the apertures of the spraying device.
6 Apparatus
6.1 Component protection

All components in contact with the spray or the test solution shall be made of, or lined with, materials

resistant to corrosion by the sprayed solution and which do not influence the corrosivity of the sprayed

test solutions.

The supports for the test specimen shall be constructed such that different substrate types do not

influence each other. It shall also be constructed so that the supports themselves do not influence the

test specimens.
6.2 Spray cabinet

The cabinet shall be such that the conditions of homogeneity and distribution of the spray are met.

Due to the limited capacity of cabinets smaller than 0,4 m , the effect of the loading of the cabinet on

the distribution of the spray and temperature shall be carefully considered. The solution shall not be

sprayed directly onto test specimens but rather spread throughout the cabinet so that it falls naturally

down
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.