Corrosion of metals and alloys - Removal of corrosion products from corrosion test specimens (ISO 8407:2021)

This document specifies procedures for the removal of corrosion products formed on metal and alloy corrosion test specimens during their exposure in corrosive environments. For the purpose of this document, the term “metals” refers to pure metals and alloys.
The specified procedures are designed to remove all corrosion products without significant removal of base metal. This allows an accurate determination of the mass loss of the metal, which occurred during exposure to the corrosive environment.
In some cases, these procedures are also applicable to metal coatings, providing the possible effects from the substrate are considered.

Korrosion von Metallen und Legierungen - Entfernen von Korrosionsprodukten von Korrosionsprobekörpern (ISO 8407:2021)

Dieses Dokument legt Verfahren für das Entfernen von Korrosionsprodukten fest, die sich während der Auslagerung von Korrosionsprüfkörpern aus Metallen und Legierungen in korrosiven Umgebungen gebildet haben. In diesem Dokument bezieht sich der Begriff „Metalle“ auf reine Metalle und Legierungen.
Die aufgeführten Verfahren wurden entwickelt, um alle Korrosionsprodukte zu entfernen, ohne das Grundmetall signifikant zu entfernen. Dadurch ist eine genaue Bestimmung des Massenverlustes des Metalls möglich, der während der Auslagerung in korrosiver Umgebung stattfindet.
Diese Verfahren sind in einigen Fällen auch bei metallenen Überzügen anwendbar, vorausgesetzt, dass die möglichen Wechselwirkungen mit dem Substrat berücksichtigt werden.
WARNUNG - Sicherheitsvorschriften für Personal: Die beim Entfernen von Korrosionsprodukten verwendeten Lösungen dürfen nur von erfahrenem Personal gehandhabt werden oder müssen unter deren Kontrolle verwendet werden. Die Geräte müssen von erfahrenem Personal verwendet und gewartet werden, nicht nur, damit die Reinigungsverfahren ordnungsgemäß durchgeführt werden können, sondern auch wegen der damit verbundenen Gefährdungen für Gesundheit und Sicherheit.

Corrosion des métaux et alliages - Élimination des produits de corrosion sur les éprouvettes d'essai de corrosion (ISO 8407:2021)

Korozija kovin in zlitin - Odstranjevanje produktov korozije s preskusnih vzorcev (ISO 8407:2021)

General Information

Status
Published
Public Enquiry End Date
19-Mar-2020
Publication Date
11-Feb-2021
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
03-Feb-2021
Due Date
10-Apr-2021
Completion Date
12-Feb-2021

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SLOVENSKI STANDARD
SIST EN ISO 8407:2021
01-marec-2021
Nadomešča:
SIST EN ISO 8407:2014

Korozija kovin in zlitin - Odstranjevanje produktov korozije s preskusnih vzorcev

(ISO 8407:2021)

Corrosion of metals and alloys - Removal of corrosion products from corrosion test

specimens (ISO 8407:2021)
Korrosion von Metallen und Legierungen - Entfernen von Korrosionsprodukten von
Korrosionsprobekörpern (ISO 8407:2021)
Corrosion des métaux et alliages - Élimination des produits de corrosion sur les
éprouvettes d'essai de corrosion (ISO 8407:2021)
Ta slovenski standard je istoveten z: EN ISO 8407:2021
ICS:
77.060 Korozija kovin Corrosion of metals
SIST EN ISO 8407:2021 en

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

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SIST EN ISO 8407:2021
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SIST EN ISO 8407:2021
EN ISO 8407
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2021
EUROPÄISCHE NORM
ICS 77.060 Supersedes EN ISO 8407:2014
English Version
Corrosion of metals and alloys - Removal of corrosion
products from corrosion test specimens (ISO 8407:2021)

Corrosion des métaux et alliages - Élimination des Korrosion von Metallen und Legierungen - Entfernen

produits de corrosion sur les éprouvettes d'essai de von Korrosionsprodukten von
corrosion (ISO 8407:2021) Korrosionsprobekörpern (ISO 8407:2021)
This European Standard was approved by CEN on 19 December 2020.

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

Poland, Portugal, Republic of North Macedonia, 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: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8407:2021 E

worldwide for CEN national Members.
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SIST EN ISO 8407:2021
EN ISO 8407:2021 (E)
Contents Page

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

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SIST EN ISO 8407:2021
EN ISO 8407:2021 (E)
European foreword

This document (EN ISO 8407:2021) 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 July 2021, and conflicting national standards shall be

withdrawn at the latest by July 2021.

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

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 8407:2014.

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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 8407:2021 has been approved by CEN as EN ISO 8407:2021 without any modification.

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SIST EN ISO 8407:2021
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SIST EN ISO 8407:2021
INTERNATIONAL ISO
STANDARD 8407
Third edition
2021-01
Corrosion of metals and alloys —
Removal of corrosion products from
corrosion test specimens
Corrosion des métaux et alliages — Élimination des produits de
corrosion sur les éprouvettes d'essai de corrosion
Reference number
ISO 8407:2021(E)
ISO 2021
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SIST EN ISO 8407:2021
ISO 8407:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
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SIST EN ISO 8407:2021
ISO 8407:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

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

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

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Procedures .................................................................................................................................................................................................................. 1

4.1 General ........................................................................................................................................................................................................... 1

4.2 Chemical procedures ......................................................................................................................................................................... 3

4.3 Electrolytic procedures .................................................................................................................................................................... 3

4.4 Mechanical procedures .................................................................................................................................................................... 3

5 Test report ................................................................................................................................................................................................................... 4

Annex A (informative) Chemical and electrolytic cleaning procedures for removal of

corrosion products ............................................................................................................................................................................................. 5

Bibliography .............................................................................................................................................................................................................................11

© ISO 2021 – All rights reserved iii
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SIST EN ISO 8407:2021
ISO 8407:2021(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 of 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 www .iso .org/

iso/ foreword .html.

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

collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/

TC 262, Metallic and other inorganic coatings, including for corrosion protection and corrosion testing of

metals and alloys, in accordance with the Agreement on technical cooperation between ISO and CEN

(Vienna Agreement).

This third edition cancels and replaces the second edition (ISO 8407:2009), which has been technically

revised. The main changes compared with the previous edition are as follows:

— Table A.1 has been revised to include current chemical cleaning procedures for the removal of

corrosion products.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
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SIST EN ISO 8407:2021
INTERNATIONAL STANDARD ISO 8407:2021(E)
Corrosion of metals and alloys — Removal of corrosion
products from corrosion test specimens

WARNING — Safety rules for personnel: handling of the solutions used for the removal of

corrosion products shall be left to skilled personnel or conducted under their control. The

equipment shall be used and maintained by skilled personnel, not only so that the procedures

can be performed correctly, but also because of the hazards to health and safety that are

involved.
1 Scope

This document specifies procedures for the removal of corrosion products formed on metal and alloy

corrosion test specimens during their exposure in corrosive environments. For the purpose of this

document, the term “metals” refers to pure metals and alloys.

The specified procedures are designed to remove all corrosion products without significant removal of

base metal. This allows an accurate determination of the mass loss of the metal, which occurred during

exposure to the corrosive environment.

In some cases, these procedures are also applicable to metal coatings, providing the possible effects

from the substrate are considered.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Procedures
4.1 General

4.1.1 A light mechanical cleaning treatment by brushing, e.g. a soft bristle brush under running water,

should first be applied to remove lightly adherent or bulky corrosion products.

4.1.2 If the treatment described in 4.1.1 does not remove all corrosion products, it will be necessary to

use other procedures. These are of three types:
a) chemical;
b) electrolytic;
c) more vigorous mechanical treatments.
NOTE These treatments will also remove some base metal.
© ISO 2021 – All rights reserved 1
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SIST EN ISO 8407:2021
ISO 8407:2021(E)

Whichever method is used, it might be necessary to repeat the cleaning treatment to ensure complete

removal of the corrosion products. Removal shall be confirmed by visual examination. The use of a low-

power microscope (i.e. × 7 to × 30) is particularly helpful with a pitted surface since corrosion products

can accumulate in pits.

4.1.3 An ideal procedure should remove corrosion products and not result in the removal of any

base metal. Two procedures can be used to confirm this point. One procedure uses a control specimen

(see 4.1.4) and the other requires a certain number of cleaning cycles on the corroded specimen (see

4.1.5). The procedures shall be maintained while the rust removal performance of the solutions listed in

Tables A.1 and A.2 is not impaired.

NOTE 1 Indications that the solution needs to be discarded can be discoloration or the presence of a significant

amount of corrosion products in the solution.

NOTE 2 Some solutions might need some aging before working without etching the substrate.

4.1.4 Uncorroded control specimens, which should be similar chemically, metallurgically and

geometrically to the test specimens, should be cleaned by the same procedure as used for the test

specimen. By weighing the control specimen before and after cleaning (weighing to the fifth significant

figure is suggested, e.g. a 70 g specimen should be weighed to three decimal places), the metal loss

resulting from cleaning may be determined. The mass loss of the control specimen will reflect the mass

loss of test specimens resulting from the cleaning procedure.

4.1.5 The cleaning of each corroded test specimen should be repeated several times after the removal

of the corrosion products is completed. The mass shall be plotted as a function of the periods of

cleaning cycles with the same interval time or time units (see Figure 1). Point A represents the mass of

corroded specimens before the start of the cleaning. In many cases, two straight lines, AB and BC, will

be obtained. Line AB characterizes the removal of corrosion products and may not always be visible.

Line BC characterizes the removal of the substrate after the corrosion products are completely removed.

Point D, which characterizes the mass of the pure metal at zero number of cleaning cycles, is obtained by

extrapolation of line BC to the ordinate axis. In some cases, the relationship may not be linear, and the

most appropriate extrapolation shall then be made. If the relationship of B and C is not linear, a linear

regression method, e.g. by applying the least squares from later points of cleaning cycles, can be used for

estimation of the point for the D value.

If the durations of each cleaning step are not equal, the x-axis should be expressed in units of cumulative

exposure time in the cleaning solution, rather than the number of cleaning steps used up to that point.

Key
X numbers of cleaning cycles or time units
Y mass
Figure 1 — Mass of corroded specimens after repetitive cleaning cycles
2 © ISO 2021 – All rights reserved
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SIST EN ISO 8407:2021
ISO 8407:2021(E)

NOTE The number of points needed to establish the line BC is sometimes less than indicated in the figure for

the specific case, especially if there is significant experience for the pickled material and solution.

4.1.6 The true mass of the specimen, after removal of the corrosion products, will be a value between

the masses represented by the points B and D, depending on the degree of protection provided by the

corrosion products during the cleaning procedure.
4.1.7 The preferred cleaning method will be one that:
a) provides efficient removal of corrosion products;

b) provides low or zero mass loss when applied to new uncorroded specimens (see 4.1.4);

c) provides a curve of mass as a function of the number of cleaning cycles or time of pickling, which is

close to horizontal when the latter is plotted as the abscissa (see 4.1.5).

4.1.8 When chemical or electrolytic procedures are used, solutions freshly prepared with distilled or

deionized water and reagent grade chemicals shall be used.

4.1.9 After cleaning, the specimen should be thoroughly rinsed with tap water. A light brushing during

this procedure will help to remove any remaining surface products resulting from the cleaning process.

Finally, the specimens shall be rinsed with distilled or deionized water. The specimen shall then be rinsed

thoroughly in ethanol and dried in air. Drying in an air stream is strongly recommended, or optionally a

hot air blower or an oven may be used. After drying, the specimens shall be allowed to cool in a dessicator

to the balance room temperature before weighing.
4.2 Chemical procedures

4.2.1 Chemical procedures involve the immersion of the corroded test specimen in a chemical solution

that is specifically designed to remove the corrosion products with minimal dissolution of any base

metal. Several procedures are listed in Annex A (see Table A.1). To facilitate the cleaning, an ultrasonic

bath treatment should be used.

4.2.2 Chemical cleaning is often preceded by a light brushing of the test specimen to remove lightly

adherent, bulky corrosion products.

4.2.3 Before the chemical treatment, clean the specimens as described in 4.1.1. In connection with

the intermittent removal of specimens for weighing, brush the specimens, if necessary, to facilitate the

removal of tightly adherent corrosion products.
4.3 Electrolytic procedures

Electrolytic cleaning can also be used to remove corrosion products. Several methods of electrolytic

cleaning of corrosion test specimens are given in Annex A (see Table A.2). To facilitate the cleaning, an

ultrasonic bath treatment should be used.

Brushing should follow electrolytic cleaning to remove any loose deposits. This will help to minimize

any redeposition of metal from reducible corrosion products in solution that would reduce the

measured mass loss.
4.4 Mechanical procedures
Mechanical procedures
...

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