SIST EN ISO 11844-2:2008
(Main)Corrosion of metals and alloys - Classification of low corrosivity of indoor atmospheres - Part 2: Determination of corrosion attack in indoor atmospheres (ISO 11844-2:2005)
Corrosion of metals and alloys - Classification of low corrosivity of indoor atmospheres - Part 2: Determination of corrosion attack in indoor atmospheres (ISO 11844-2:2005)
This part of ISO 11844 specifies methods for determination of corrosion rate with standard specimens of metals in indoor atmospheres with low corrosivity. For this direct method of evaluation of corrosivity, different sensitive methods can be applied using standard specimens of the following metals: copper, silver, zinc and steel. The values obtained from the measurements are used as classification criteria for the determination of indoor atmospheric corrosivity.
Korrosion von Metallen und Legierungen - Einteilung der Korrosivität in Räumen mit geringer Korrosivität - Teil 2: Bestimmung der korrosiven Belastung in Räumen (ISO 11844-2:2005)
Dieser Teil von ISO 11844 legt Verfahren zur Bestimmung der Korrosionsgeschwindigkeit an Metall-Standardproben
in Innenräumen mit geringer Korrosivität fest. Für diese direkte Bewertung der Korrosivität können
Methoden mit unterschiedlicher Empfindlichkeit angewendet werden, indem metallische Standardproben aus
Kupfer, Silber, Zink und Stahl untersucht werden. Die bei den Messungen bestimmten Werte werden als
Einteilungskriterien zur Bestimmung der atmosphärischen Korrosivität in Innenräumen angewendet.
Corrosion des métaux et alliages - Classification de la corrosivité faible des atmospheres d'intérieur - Partie 2: Détermination de l'attaque par corrosion dans les atmospheres d'intérieur (ISO 11844-2:2005)
L'ISO 11844-2:2005 spécifie des méthodes de détermination de la vitesse de corrosion d'éprouvettes normalisées de métaux dans des atmosphères d'intérieur à faible corrosivité. Pour cette évaluation directe de la corrosivité, différentes méthodes sensibles peuvent être appliquées à des éprouvettes normalisées des métaux suivants: cuivre, argent, zinc et acier. Les valeurs obtenues par mesurage servent de critères de classification pour la détermination de la corrosivité des atmosphères d'intérieur.
Klasifikacija nizke korozivnosti notranjih atmosfer - 2. del: Ugotavljanje napada korozije v notranjih atmosferah (ISO 11844-2:2005)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 11844-2:2008
01-julij-2008
Klasifikacija nizke korozivnosti notranjih atmosfer - 2. del: Ugotavljanje napada
korozije v notranjih atmosferah (ISO 11844-2:2005)
Corrosion of metals and alloys - Classification of low corrosivity of indoor atmospheres -
Part 2: Determination of corrosion attack in indoor atmospheres (ISO 11844-2:2005)
Corrosion des métaux et alliages - Classification de la corrosivité faible des atmospheres
d'intérieur - Partie 2: Détermination de l'attaque par corrosion dans les atmospheres
d'intérieur (ISO 11844-2:2005)
Ta slovenski standard je istoveten z: EN ISO 11844-2:2008
ICS:
77.060 Korozija kovin Corrosion of metals
SIST EN ISO 11844-2:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
EN ISO 11844-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2008
ICS 77.060
English Version
Corrosion of metals and alloys - Classification of low corrosivity
of indoor atmospheres - Part 2: Determination of corrosion
attack in indoor atmospheres (ISO 11844-2:2005)
Corrosion des métaux et alliages - Classification de la Korrosion von Metallen und Legierungen - Einteilung der
corrosivité faible des atmosphères d'intérieur - Partie 2: Korrosivität in Räumen mit geringer Korrosivität - Teil 2:
Détermination de l'attaque par corrosion dans les Bestimmung der korrosiven Belastung in Räumen (ISO
atmosphères d'intérieur (ISO 11844-2:2005) 11844-2:2005)
This European Standard was approved by CEN on 21 March 2008.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
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Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11844-2:2008: E
worldwide for CEN national Members.
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EN ISO 11844-2:2008 (E)
Contents Page
Foreword.3
2
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EN ISO 11844-2:2008 (E)
Foreword
The text of ISO 11844-2:2005 has been prepared by Technical Committee ISO/TC 156 “Corrosion of metals
and alloys” of the International Organization for Standardization (ISO) and has been taken over as EN ISO
11844-2:2008 by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” 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 2008, and conflicting national standards shall be withdrawn at
the latest by October 2008.
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.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 11844-2:2005 has been approved by CEN as a EN ISO 11844-2:2008 without any
modification.
3
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INTERNATIONAL ISO
STANDARD 11844-2
First edition
2005-12-15
Corrosion of metals and alloys —
Classification of low corrosivity of indoor
atmospheres —
Part 2:
Determination of corrosion attack in
indoor atmospheres
Corrosion des métaux et alliages — Classification de la corrosivité
faible des atmosphères d'intérieur —
Partie 2: Détermination de l'attaque par corrosion dans les atmosphères
d'intérieur
Reference number
ISO 11844-2:2005(E)
©
ISO 2005
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ISO 11844-2:2005(E)
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ii © ISO 2005 – All rights reserved
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ISO 11844-2:2005(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope .1
2 Normative references .1
3 Principle.1
4 Methods .1
Annex A (normative) Determination of corrosion rate by mass change measurement .4
Annex B (normative) Determination of corrosion rate by electrolytic cathodic reduction .7
Annex C (informative) Determination of corrosion rate by resistance measurements .9
Bibliography .11
© ISO 2005 – All rights reserved iii
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ISO 11844-2:2005(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
ISO 11844-2 was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.
ISO 11844 consists of the following parts, under the general title Corrosion of metals and alloys —
Classification of low corrosivity of indoor atmospheres:
⎯ Part 1: Determination and estimation of indoor corrosivity
⎯ Part 2: Determination of corrosion attack in indoor atmospheres
⎯ Part 3: Measurement of environmental parameters affecting indoor corrosivity
iv © ISO 2005 – All rights reserved
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ISO 11844-2:2005(E)
Introduction
This part of ISO 11844 describes standard specimens, their exposure and evaluation for the derivation of the
indoor corrosivity categories.
The determination of the corrosion attack is, at the present state of knowledge, the most reliable way, and
usually also an economical way, for evaluation of corrosivity taking into account all main local environmental
influences.
© ISO 2005 – All rights reserved v
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INTERNATIONAL STANDARD ISO 11844-2:2005(E)
Corrosion of metals and alloys — Classification of low
corrosivity of indoor atmospheres —
Part 2:
Determination of corrosion attack in indoor atmospheres
1 Scope
This part of ISO 11844 specifies methods for determination of corrosion rate with standard specimens of
metals in indoor atmospheres with low corrosivity. For this direct method of evaluation of corrosivity, different
sensitive methods can be applied using standard specimens of the following metals: copper, silver, zinc and
steel. The values obtained from the measurements are used as classification criteria for the determination of
indoor atmospheric corrosivity.
2 Normative references
The following referenced documents are indispensable for the application 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.
IEC 60654-4:1987, Operating conditions for industrial-process measurement and control equipment — Part 4:
Corrosive and erosive influences
ANSI/ISA-S71.04:1985, Environmental conditions for Process, Measurement and Control Systems: Airborne
Contaminants
3 Principle
The corrosivity of the indoor location, e.g. control rooms, electric boxes, storage rooms, during transportation,
in museums, etc., is determined from the corrosion rate calculated from the mass change or resistance
change per unit area of standard specimens of metals after exposure for a certain time period. Different
materials are sensitive to different environmental parameters or their combinations.
4 Methods
The following methods described in Annexes A and B are available for evaluation of the corrosion attack:
⎯ Determination of corrosion rate by mass change measurements (Annex A)
⎯ Determination of corrosion rate by electrolytic cathodic reduction (Annex B)
The method described in informative Annex C is suitable for continuous or periodic monitoring of the corrosion
attack:
⎯ Determination of corrosion rate by resistance measurements (Annex C)
© ISO 2005 – All rights reserved 1
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ISO 11844-2:2005(E)
Special features of the methods, such as sensitivity, possibility for continuous or periodic assessment of
corrosion attack, available space, etc., should be considered when choosing the most suitable methods.
Examples of suitable racks for exposure of specimens are given in Figure 1.
Dimensions in millimetres
Key
1 specimens
2 support ∅ ∼ 15
a) Sketch of a rack for sheltered exposure of specimens
Figure 1 — Examples of exposure racks with suggested dimensions
2 © ISO 2005 – All rights reserved
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ISO 11844-2:2005(E)
Dimensions in millimetres
Key
1 specimens
2 distance pins
3 plastic plates
4 open air flow
5 plastic screws
b) Sketch of a mounting plate for unsheltered exposure of specimens
Figure 1 (continued)
© ISO 2005 – All rights reserved 3
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ISO 11844-2:2005(E)
Annex A
(normative)
Determination of corrosion rate by mass change measurement
A.1 Principle
Mass increase measurements can be performed on all metals and comparatively large surfaces can be
evaluated. The technique is relatively easy to operate.
The mass loss determination gives a best estimate of the corrosion effect. The method is not yet applicable to
all metals. Both mass increase and mass loss determination using an ultramicro-balance has a precision of
2
about ± 10 mg/m with the method described below.
Due to the difficulty of distinguishing corrosion effects from other surface-related phenomena, such as sorption
and contamination by particulate matter, the specimens should preferably be exposed under shelter.
A.2 Specimens
It is preferable to use rectangular specimens in the form of flat sheets, as they can be readily weighed. A
convenient specimen size is 10 mm × 50 mm. Specimens may be larger provided that they can be accurately
weighed. The specimen thickness may preferably be 0,5 mm.
The materials used to prepare the specimens are of the following quality,
Silver: 99,98 % min.
Copper: ISO 1336-1337, Cu-DHP, 99,85 % min.
Zinc: 99,45 % min.
Carbon steel: ISO 3574, CR 1, max. 0,15 % C, max. 0,04 % P, max . 0,05 % S, max. 0,6 % Mn
The specimens should, before weighing, be prepared as follows:
a) A hole with diameter 4 mm is cut at the upper side of the specimen.
1)
b) Abrading
⎯ Silver and copper with silicon carbide paper to 1 200 P (600 grit).
⎯ Zinc and carbon steel to 500 P (320 grit).
c) Cleaning in deionised water.
d) Degreasing in ethanol in an ultrasonic bath for 5 min.
e) Drying.
...
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