SIST EN ISO 6158:2004
(Main)Metallic coatings - Electrodeposited coatings of chromium for engineering purposes (ISO 6158:2004)
Metallic coatings - Electrodeposited coatings of chromium for engineering purposes (ISO 6158:2004)
ISO 6158:2004 specifies requirements for electroplated coatings of 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.
Metallische Überzüge - Galvanische Chromüberzüge für technische Zwecke (ISO 6158/2004)
Diese Internationale Norm enthält Anforderungen für galvanische Chromüberzüge, mit und ohne Zwischen-überzügen, die auf Eisenwerkstoffen oder Nichteisenmetallen für technische Zwecke abgeschieden werden. Die Bezeichnung der Überzüge erlaubt es, die Dicke des Chroms, das für typische technische Anwendungen geeignet ist, festzulegen.
Revetements métalliques - Dépôts électrolytiques de chrome pour usages industriels (ISO 6158:2004)
L'ISO 6158:2004 spécifie les exigences relatives aux dépôts électrolytiques de chrome, avec ou sans sous-couches, sur les métaux de base ferreux et non ferreux, pour usages industriels.
La désignation des revêtements permet de spécifier l'épaisseur de chrome appropriée pour les applications industrielles courantes.
Kovinske prevleke – Galvanske prevleke kroma za tehnično uporabo (ISO 6158:2004)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 6158:2004
01-september-2004
.RYLQVNHSUHYOHNH±*DOYDQVNHSUHYOHNHNURPD]DWHKQLþQRXSRUDER ,62
Metallic coatings - Electrodeposited coatings of chromium for engineering purposes (ISO
6158:2004)
Metallische Überzüge - Galvanische Chromüberzüge für technische Zwecke (ISO
6158/2004)
Revetements métalliques - Dépôts électrolytiques de chrome pour usages industriels
(ISO 6158:2004)
Ta slovenski standard je istoveten z: EN ISO 6158:2004
ICS:
25.220.40 Kovinske prevleke Metallic coatings
SIST EN ISO 6158:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 6158:2004
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SIST EN ISO 6158:2004
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SIST EN ISO 6158:2004
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SIST EN ISO 6158:2004
INTERNATIONAL ISO
STANDARD 6158
Second edition
2004-05-15
Metallic coatings — Electrodeposited
coatings of chromium for engineering
purposes
Revêtements métalliques — Dépôts électrolytiques de chrome pour
usages industriels
Reference number
ISO 6158:2004(E)
©
ISO 2004
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SIST EN ISO 6158:2004
ISO 6158:2004(E)
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ii © ISO 2004 – All rights reserved
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SIST EN ISO 6158:2004
ISO 6158:2004(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 2
4 Information to be supplied to the electroplater .2
5 Designation. 3
6 Requirements . 5
7 Sampling . 8
Annex A (informative) Typical thickness of chromium specified in engineering applications. 9
Annex B (informative) 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
© ISO 2004 – All rights reserved iii
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SIST EN ISO 6158:2004
ISO 6158:2004(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 second edition cancels and replaces the first edition (ISO 6158:1984), which has been technically
revised.
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SIST EN ISO 6158:2004
ISO 6158:2004(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 and 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 6158:2004
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SIST EN ISO 6158:2004
INTERNATIONAL STANDARD ISO 6158:2004(E)
Metallic coatings — Electrodeposited coatings of chromium for
engineering purposes
1 Scope
This International Standard specifies requirements for electroplated coatings of 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 2079, Surface treatment and metallic coatings — General classification of terms
ISO 2080, Electroplating and related processes — Vocabulary
ISO 2177, Metallic coatings — Measurement of coating thickness — Coulometric measurement 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 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
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 — Pretreatments of iron or steel to reduce the risk of
hydrogen embrittlement
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SIST EN ISO 6158:2004
ISO 6158:2004(E)
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
EN 12508, Corrosion protection of metals and alloys — Surface treatment, metallic and other inorganic
coatings — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2064, ISO 2079, ISO 2080 and
EN 12508 apply.
4 Information to be supplied to the electroplater
4.1 Essential information
When ordering articles to be electroplated in accordance with this International Standard, the purchaser shall
provide the following information in writing, e.g., in the contract or purchase order, or on engineering drawings.
a) The designation (see Clause 5).
b) The requirements for special test specimens (see 6.1).
c) The significant surface, indicated by drawings of the articles or by suitably marked samples (see 6.2).
d) 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).
e) The type, size and number of defects that can be tolerated (see 6.2).
f) Additional portions of the surface where minimum thickness requirements apply (see 6.4).
g) The test method to be used to measure thickness (see 6.4).
h) The adhesion and porosity requirements, and test methods (see 6.6 and 6.7, respectively).
i) The tensile strength of parts and the requirement for stress-relief heat treatment before electroplating
(see 6.8).
j) Requirements for any embrittlement relief heat treatment after electroplating, and for hydrogen
embrittlement testing (see 6.9).
k) The sampling plan and acceptance levels (see Clause 7).
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SIST EN ISO 6158:2004
ISO 6158:2004(E)
4.2 Additional information
The following additional information may be provided, when appropriate:
a) the nominal composition or specification, and metallurgical condition of the basis metal including
hardness (see 5.3);
NOTE 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.
b) any special requirements for, or restrictions on, pre-treatment, e.g., vapour blasting instead of acid pre-
treatment;
c) where applicable, any special requirements for adhesion (see 6.6);
d) the necessity for any treatment to induce compressive stress, e.g.; peening before or after electroplating
(see 6.10);
e) requirements for undercoats (see 5.5 and 6.11) and stripping (see 6.12).
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 susceptiblity to hydrogen embrittlement.
5.2 Components
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) a solidus (/);
f) 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. The coating designation shall
include the thicknesses of the coatings in micrometres, as well as heat treatment requirements (see 5.4).
Double solidi or separators (//) shall be used to indicate that a step has been omitted or is not a
requirement.
NOTE It is recommended that the specific alloy be identified by its standard designation following the chemical
symbol of the basis metal; e.g., its UNS number, or the national or regional equivalent may be placed between the
symbols < >.
EXAMPLE Fe is the UNS designation for a high-strength steel.
See [1] to [7].
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SIST EN ISO 6158:2004
ISO 6158:2004(E)
5.3 Designating the basis metal
The basis metal shall be designated by its chemical symbol or, if an alloy, its principal constituent.
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.
NOTE To ensure proper surface preparation and hence adherence of the coating to the substrate, it is important to
identify the specific alloy and its metallurgical condition (tempered, nitrided, etc.).
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 centigrade;
c) the duration of the heat treatment, in hours.
EXAMPLE [SR(210)1] designates stress relief heat treatment at 210 °C for 1 h.
When heat treatment is specified, the requirements shall be included in the designation (see 5.6).
5.5 Type and thickness of metal layers
The electrodeposited chromium coating shall be designated by the symbols given in Table 1 placed after a
number giving the specified minimum local thickness of the coating in micrometres. Annex A provides
information on typical thickness of chromium specified in engineering applications.
EXAMPLE Cr50hr designates a regular hard chromium coating that is 50 µm thick.
Table 1 — Symbols for different types of chromium
Type of chromium Symbol
Regular hard chromium hr
Hard chromium from mixed acid hm
solutions
Microcracked hard chromium hc
Microporous hard chromium hp
Duplex chromium hd
Special types of chromium hs
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SIST EN ISO 6158:2004
ISO 6158:2004(E)
Nickel undercoats shall be designated in accordance with ISO 4526, i.e., the symbol, sf for sulfur-free nickel
coatings, sc for sulfur-containing nicke
...
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