EN ISO 8407:2014

SLOVENSKI STANDARD
01-julij-2014
Korozija kovin in zlitin - Odstranjevanje produktov korozije s preskusnih vzorcev
(ISO 8407:2009)
Corrosion of metals and alloys - Removal of corrosion products from corrosion test
specimens (ISO 8407:2009)
Korrosion von Metallen und Legierungen - Entfernen von Korrosionsprodukten von
Korrosionsprobekörpern (ISO 8407:2009)
Corrosion des métaux et alliages - Élimination des produits de corrosion sur les
éprouvettes d'essai de corrosion (ISO 8407:2009)
Ta slovenski standard je istoveten z: EN ISO 8407:2014
ICS:
77.060 Korozija kovin Corrosion of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 8407
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2014
ICS 77.060
English Version
Corrosion of metals and alloys - Removal of corrosion products
from corrosion test specimens (ISO 8407:2009)
Corrosion des métaux et alliages - Élimination des produits Korrosion von Metallen und Legierungen - Entfernen von
de corrosion sur les éprouvettes d'essai de corrosion (ISO Korrosionsprodukten von Korrosionsprobekörpern (ISO
8407:2009) 8407:2009)
This European Standard was approved by CEN on 9 February 2014.

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, 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
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8407:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
The text of ISO 8407:2009 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 8407:2014 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 September 2014, and conflicting national standards shall be
withdrawn at the latest by September 2014.
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, 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 8407:2009 has been approved by CEN as EN ISO 8407:2014 without any modification.

INTERNATIONAL ISO
STANDARD 8407
Second edition
2009-11-01
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 8407:2009(E)
©
ISO 2009
ISO 8407:2009(E)
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ii © ISO 2009 – All rights reserved

ISO 8407:2009(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.
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.
ISO 8407 was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys.
This second edition cancels and replaces the first edition (ISO 8407:1991), which has been technically revised.

INTERNATIONAL STANDARD ISO 8407:2009(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 removal of corrosion
products must be left to skilled personnel or conducted under their control. The equipment must 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 International Standard 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
International Standard, 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.
These procedures may, in some cases, also be applied to metal coatings. However, possible effects from the
substrate must be considered.
2 Procedures
2.1 General
2.1.1 A light mechanical cleaning treatment by brushing with a soft bristle brush under running water should
first be applied to remove lightly adherent or bulky corrosion products.
2.1.2 If the treatment described in 2.1.1 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.
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 may
accumulate in pits.
2.1.3 An ideal procedure should remove corrosion products and not result in removal of any base metal.
Two procedures can be used to confirm this point. One procedure uses a control specimen (2.1.3.1) and the
other requires a certain number of cleaning cycles on the corroded specimen (2.1.3.2).
ISO 8407:2009(E)
2.1.3.1 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.
2.1.3.2 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 number of equal
cleaning cycles (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 substrate after the
corrosion products are gone. 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 relation may
not be linear and the most appropriate extrapolation shall then be made.
If no intervals of equal cleaning cycles are used during one cleaning procedure, the x-axis should be
expressed in time units.
Key
X numbers of cleaning cycles or time units
Y mass
Figure 1 — Mass of corroded specimens after repetitive cleaning cycles
2.1.3.3 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 furnished by the
corrosion products during the cleaning procedure.
2.1.4 The preferred cleaning method will be that which
a) provides efficient removal of corrosion products,
b) provides low or zero mass loss when applied to new uncorroded specimens (see 2.1.3.1), and
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 2.1.3.2).
2.1.5 When chemical or electrolytic procedures are used, solutions freshly prepared with distilled or
deionized water and reagent grade chemicals shall be used.
2.1.6 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
2 © ISO 2009 – All rights reserved

ISO 8407:2009(E)
specimens shall be rinsed with distilled or deionized water. The specimen shall then be rinsed thoroughly in
ethanol and dried using a hot air blower or an oven. After that, the specimens shall be allowed to cool in a
dessicator to the balance room temperature before weighing.
2.2 Chemical procedures
2.2.1 Chemical procedures involve immersion of the corrosion test specimen in a chemical solution which 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, it is strongly recommended to use
an ultrasonic bath treatment.
2.2.2 Chemical cleaning is often preceded by light brushing of the test specimen to remove lightly adherent,
bulky corrosion products.
2.2.3 Before the chemical treatment, clean the specimens as described in 2.1.1. In connection with the
intermittent removal of specimens for weighing, brush the specimens, if necessary, to facilitate the removal of
tightly adherent corrosion products.
2.3 Electrolytic procedures
Electrolytic cleaning can also be used t
...