SIST EN ISO 6158:2011

SLOVENSKI STANDARD
SIST EN ISO 6158:2011
01-oktober-2011
1DGRPHãþD
SIST EN ISO 6158:2004
SIST EN ISO 6158:2004/prAC:2009
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XSRUDER,62
Metallic and other inorganic coatings - Electrodeposited coatings of chromium for
engineering purposes (ISO 6158:2011)
Metallische Überzüge - Galvanische Chromüberzüge für technische Zwecke (ISO
6158:2011)
Revêtements métalliques et autres revêtements inorganiques - Dépôts électrolytiques de
chrome pour usages industriels (ISO 6158:2011)
Ta slovenski standard je istoveten z: EN ISO 6158:2011
ICS:
25.220.40 Kovinske prevleke Metallic coatings
SIST EN ISO 6158:2011 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 6158:2011

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SIST EN ISO 6158:2011


EUROPEAN STANDARD
EN ISO 6158

NORME EUROPÉENNE

EUROPÄISCHE NORM
July 2011
ICS 25.220.40 Supersedes EN ISO 6158:2004
English Version
Metallic and other inorganic coatings - Electrodeposited coatings
of chromium for engineering purposes (ISO 6158:2011)
Revêtements métalliques et autres revêtements Metallische und andere anorganische Überzüge -
inorganiques - Dépôts électrolytiques de chrome pour Galvanische Chromüberzüge für technische Zwecke (ISO
usages industriels (ISO 6158:2011) 6158:2011)
This European Standard was approved by CEN on 14 July 2011.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6158:2011: E
worldwide for CEN national Members.

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SIST EN ISO 6158:2011
EN ISO 6158:2011 (E)
Contents Page
Foreword .3

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SIST EN ISO 6158:2011
EN ISO 6158:2011 (E)
Foreword
This document (EN ISO 6158:2011) has been prepared by Technical Committee ISO/TC 107 "Metallic and
other inorganic coatings" in collaboration with 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 January 2012, and conflicting national standards shall be withdrawn at
the latest by January 2012.
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 6158:2004.
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, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 6158:2011 has been approved by CEN as a EN ISO 6158:2011 without any modification.

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SIST EN ISO 6158:2011

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SIST EN ISO 6158:2011

INTERNATIONAL ISO
STANDARD 6158
Third edition
2011-07-15

Metallic and other inorganic coatings —
Electrodeposited coatings of chromium
for engineering purposes
Revêtements métalliques et autres revêtements inorganiques — Dépôts
électrolytiques de chrome pour usages industriels




Reference number
ISO 6158:2011(E)
©
ISO 2011

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SIST EN ISO 6158:2011
ISO 6158:2011(E)


COPYRIGHT PROTECTED DOCUMENT


©  ISO 2011
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland

ii © ISO 2011 – All rights reserved

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SIST EN ISO 6158:2011
ISO 6158:2011(E)
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .2
4 Information to be supplied by the purchaser to the processor.2
5 Designation .3
6 Requirements.6
7 Sampling.8
Annex A (informative) Typical thickness of chromium specified in engineering applications .9
Annex B (normative) Thickness test methods for electroplated chromium and other metallic
coatings.10
Annex C (normative) Determination of cracks and pores in chromium coatings.11
Bibliography.12

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SIST EN ISO 6158:2011
ISO 6158:2011(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 6158 was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings,
Subcommittee SC 3, Electrodeposited coatings and related finishes.
This third edition cancels and replaces the second edition (ISO 6158:2004), of which it constitutes a minor
revision.
iv © ISO 2011 – All rights reserved

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SIST EN ISO 6158:2011
ISO 6158:2011(E)
Introduction
Electrodeposited chromium coatings are frequently deposited from hexavalent chromium solutions similar to
those used for decorative electroplating. Engineering chromium coatings, however, are generally thicker than
decorative ones. Regular or conventional chromium is the type most frequently specified, but porous, cracked
or specially profiled surfaces and duplex chromium are also applied to achieve oil-retaining or non-sticking
surfaces, or to improve corrosion resistance.
Electrodeposited chromium coatings for engineering applications are most often applied directly to the basis
metal to increase wear and abrasion resistance, to increase fretting resistance, to reduce static and kinetic
friction, to reduce galling and seizing, to increase corrosion resistance, and to build up undersize or worn parts.
For protection against severe corrosion, nickel or other metallic undercoats may be applied prior to the
electrodeposition of chromium, or the corrosion resistance of the chromium coating may be increased by
alloying, e.g. with molybdenum.

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SIST EN ISO 6158:2011

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SIST EN ISO 6158:2011
INTERNATIONAL STANDARD ISO 6158:2011(E)

Metallic and other inorganic coatings — Electrodeposited
coatings of chromium for engineering purposes
WARNING — This International Standard may not be compliant with some countries’ health and safety
legislations and calls for the use of substances and/or procedures that may be injurious to health if
adequate safety measures are not taken. This International Standard does not address any health
hazards, safety or environmental matters and legislations associated with its use. It is the
responsibility of the user of this International Standard to establish appropriate health, safety and
environmentally acceptable practices and take suitable actions to comply with any national and
International regulations. Compliance with this International Standard does not in itself confer
immunity from legal obligations.
1 Scope
This International Standard specifies requirements for electroplated coatings of hexavalent chromium, with or
without undercoats, on ferrous and non-ferrous metals for engineering purposes. The coating designation
provides a means of specifying the thickness of chromium appropriate for typical engineering applications.
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.
ISO 1463, Metallic and oxide coatings — Measurement of coating thickness — Microscopical method
ISO 2064, Metallic and other inorganic coatings — Definitions and conventions concerning the measurement
of thickness
ISO 2080, Metallic and other inorganic coatings — Surface treatment, metallic and other inorganic coatings —
Vocabulary
ISO 2177, Metallic coatings — Measurement of coating thickness — Coulometric method by anodic
dissolution
ISO 2178, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness — Magnetic
method
ISO 2819, Metallic coatings on metallic substrates — Electrodeposited and chemically deposited coatings —
Review of methods available for testing adhesion
ISO 3497, Metallic coatings — Measurement of coating thickness — X-ray spectrometric method
ISO 3543, Metallic and non-metallic coatings — Measurement of thickness — Beta backscatter method
ISO 3882, Metallic and other inorganic coatings — Review of methods of measurement of thickness
ISO 4516, Metallic and other inorganic coatings — Vickers and Knoop microhardness tests
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SIST EN ISO 6158:2011
ISO 6158:2011(E)
ISO 4519, Electrodeposited metallic coatings and related finishes — Sampling procedures for inspection by
attributes
ISO 4526, Metallic coatings — Electroplated coatings of nickel for engineering purposes
ISO 9220, Metallic coatings — Measurement of coating thickness — Scanning electron microscope method
ISO 9587, Metallic and other inorganic coatings — Pretreatment of iron or steel to reduce the risk of hydrogen
embrittlement
ISO 9588, Metallic and other inorganic coatings — Post-coating treatments of iron or steel to reduce the risk
of hydrogen embrittlement
ISO 10309, Metallic coatings — Porosity tests — Ferroxyl test
ISO 10587, Metallic and other inorganic coatings — Test for residual embrittlement in both metallic-coated
and uncoated externally-threaded articles and rods — Inclined wedge method
ISO 12686, Metallic and other inorganic coatings — Automated controlled shot-peening of metallic articles
prior to nickel, autocatalytic nickel or chromium plating, or as a final finish
ISO 15724, Metallic and other inorganic coatings — Electrochemical measurement of diffusible hydrogen in
steels — Barnacle electrode method
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2064, ISO 2080, ISO 3882,
ISO 9587, ISO 9588 and ISO 12686 apply.
4 Information to be supplied by the purchaser to the processor
When ordering articles to be processed in accordance with this International Standard, the purchaser shall
provide the following essential information in writing, for example, in the contract or purchase order, or on the
engineering drawings:
a) the designation (see Clause 5);
b) the nominal composition or specification, and metallurgical condition of the basis metal including
hardness (see 5.3); in the case of reclaimed articles, it may not be possible to supply this information, and
it may, therefore, be difficult to guarantee the quality of the coating;
c) the nature, condition and finish of the basis metal if they are likely to affect the serviceability and/or
appearance of the coating (see 6.3);
d) the significant surface, indicated by drawings of the articles or by suitably marked samples (see 6.2);
e) the requirements for special test specimens (see 6.1);
f) the appearance and surface finish of the chromium coating, e.g. as-plated, ground or machined (see 6.2
and 6.3); alternatively, samples showing the appearance and required finish shall be supplied or
approved by the purchaser, and used for comparison purposes (see 6.2);
g) the necessity for any treatment to induce compressive stress, e.g. peening before or after electroplating
(see 6.10);
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SIST EN ISO 6158:2011
ISO 6158:2011(E)
h) any special requirements for, or restrictions on, pretreatment, e.g. vapour blasting instead of acid
pretreatment;
i) positions, where unavoidable, contact marks and the type, size and number of other defects that are
acceptable (see 6.2);
j) requirements for undercoats (see 5.5 and 6.11) and stripping (see 6.12);
k) the test method to be used to measure thickness (see 6.4) and additional segment of the surface where
minimum thickness requirements apply;
l) the adhesion and porosity requirements, and test methods (see 6.6 and 6.7, respectively);
m) the tensile strength of parts and the requirement for stress-relief heat treatment before electroplating
(see 6.8);
n) requirements for any embrittlement-relief heat treatment after electroplating, and for hydrogen
embrittlement testing (see 6.9);
o) the sampling plan and acceptance levels (see Clause 7);
p) any additional information, e.g. any special requirements for adhesion (see 6.6).
5 Designation
5.1 General
The designation shall appear on engineering drawings, in the purchase order, the contract or in the detailed
product specification.
The designation specifies, in the order given, the basis metal, the specific alloy (optional), stress relief
requirements, the type and thickness of undercoats, the type and thickness of the electroplated chromium
coating, and post-treatments such as heat treatment to reduce susceptibility to hydrogen embrittlement.
5.2 Designation specification
The designation shall comprise the following:
a) the term “Electrodeposited coating”;
b) the number of this International Standard, i.e. ISO 6158;
c) a hyphen;
d) the chemical symbol of the basis metal (see 5.3), e.g. Fe (iron or steel);
e) a solidus (/);
f) stress relief (SR) designation, (see 5.4);
g) a solidus (/);
h) chemical symbols for the chromium coating, as well as coatings applied prior to chromium electroplating,
separated by solidi for each stage in the coating sequence in the order of application; double solidi or
separators (//) to be used to indicate that a step has been omitted or is not a requirement;
i) a number indicating the minimum thickness, in micrometres, of the coating(s) followed by a solidus (/);
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SIST EN ISO 6158:2011
ISO 6158:2011(E)
j) hydrogen-embrittlement-relief (ER) designation (see 5.4).
See 5.6 for examples of designations.
5.3 Designation of basis metal
The basis metal shall be designated by its chemical symbol, or its principal constituent if it is an alloy.
For example:
a) Fe for iron and steel;
b) Zn for zinc alloys;
c) Cu for copper and copper alloys;
d) Al for aluminium and aluminium alloys.
To ensure proper surface preparation and hence adherence of the coating to the substrate, it is essential to
identify the specific alloy and its metallurgical condition (tempered, nitrided, etc.).
It is recommended that the specific alloy be identified by its standard designation following the chemical
symbol of the basis metal; for example, its UNS number, or the national or regional equivalent, may be placed
between the symbols < > (see Bibliography).
EXAMPLE Fe is the UNS designation for a high-strength steel.
5.4 Designation of heat treatment requirements
The heat treatment requirements shall be in brackets and designated as follows:
a) the letters SR, for heat treatment for stress relief purposes; the letters ER, for heat treatment for the
purpose of reducing susceptibility to hydrogen embrittlement; the letters, HT, for heat treatment for other
purposes;
b) in parenthesis, the minimum temperature, in degrees Celsius;
c) the duration of the heat treatment, in hours;
EXAMPLE
...