SIST EN ISO 2081:2018

Metallic and other inorganic coatings - Electroplated coatings of zinc with supplementary treatments on iron or steel (ISO 2081:2018)

This document specifies requirements for electroplated coatings of zinc with supplementary treatments
on iron or steel. It includes information to be supplied by the purchaser to the electroplater, and the
requirements for heat treatment before and after electroplating.
It is not applicable to zinc coatings applied
— to sheet, strip or wire in the non-fabricated form,
— to close-coiled springs, or
— for purposes other than protective or decorative.
This document does not specify requirements for the surface condition of the basis metal prior to
electroplating with zinc. However, defects in the surface of the basis metal can adversely affect the
appearance and performance of the coating.
The coating thickness that can be applied to threaded components can be limited by dimensional
requirements, including class or fit.

Metallische und andere anorganische Überzüge - Galvanische Zinküberzüge auf Eisenwerkstoffen mit zusätzlicher Behandlung (ISO 2081:2018)

Dieses Dokument legt Anforderungen an galvanisch abgeschiedene Zinküberzüge auf Eisenwerkstoffen mit zusätzlicher Behandlung fest. Es enthält Informationen, die der Auftraggeber dem galvanischen Betrieb geben muss, sowie Anforderungen an die Wärmebehandlung vor und nach der galvanischen Metallabschei-dung.
Es gilt nicht für Zinküberzüge
-   auf Blechen, Bändern oder Draht in unbearbeiteter Form,
-   auf engspiraligen Federn oder
-   für andere Zwecke als zum Korrosionsschutz oder zur Dekoration.
Dieses Dokument legt keine Anforderungen an die Oberflächenbeschaffenheit des Grundmetalls vor der galvanischen Zinkabscheidung fest. Fehler in der Oberfläche des Grundmetalls können jedoch das Aussehen und die Gebrauchstauglichkeit von Zinküberzügen ungünstig beeinflussen.
Die auf Verbindungselemente mit Gewinde aufzubringende Schichtdicke kann durch Abmessungsanfor-derungen, wie Klasse oder Passung, begrenzt sein.

Revêtements métalliques et autres revêtements inorganiques - Dépôts électrolytiques de zinc avec traitements supplémentaires sur fer ou acier (ISO 2081:2018)

ISO 2081:2018 spécifie les exigences applicables aux dépôts électrolytiques de zinc avec traitements supplémentaires sur le fer ou l'acier. Il inclut les informations à fournir par l'acheteur à l'électroplaste, ainsi que les exigences relatives au traitement thermique avant et après dépôt électrolytique.
ISO 2081:2018 n'est pas applicable aux revêtements de zinc appliqués:
- sur tôles, feuillards ou fils à l'état non façonné;
- sur des ressorts à spirales serrées;
- dans un autre but que la protection ou la décoration.
ISO 2081:2018 ne spécifie pas d'exigence relative à l'état de surface du métal de base avant dépôt électrolytique de zinc. Toutefois, la présence de défauts à la surface du métal de base peut avoir une incidence négative sur l'aspect et la performance du revêtement.
L'épaisseur du revêtement susceptible d'être appliqué sur les pièces filetées peut être limitée par des exigences dimensionnelles, y compris la classe ou l'ajustement.

Kovinske in druge anorganske prevleke - Galvanske prevleke cinka z dodatno obdelavo na železu in jeklu (ISO 2081:2018)

Ta dokument določa zahteve za galvanske cinkove prevleke z dodatno obdelavo na železu in jeklu. Zajema informacije, ki jih mora kupec dostaviti izdelovalcu galvanske prevleke, in zahteve za prevleke za toplotno obdelavo pred in po galvanizaciji.
Ne uporablja se za cinkove prevleke:
– za pločevine, trakove ali žice v nepredelani obliki,
– za vijačne vzmeti ali
– za uporabe, katerih namen ni zaščita ali okrasitev.
Ta dokument ne določa zahtev za stanje površine osnovne kovine pred galvanizacijo s cinkom. Vendar pa defekti na površini osnovne kovine lahko negativno vplivajo na videz in učinkovitost prevleke.
Debelina prevleke, ki se lahko nanese na navojne komponente, je lahko omejena z dimenzijskimi zahtevami, vključno z razredom ali prileganjem.

General Information

• Status: Published
• Public Enquiry End Date: 01-Jul-2016
• Publication Date: 18-Apr-2018
• ICS: 25.220.40 - Metallic coatings
• Technical Committee: IPKZ - Protection of metals against corrosion
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 03-Apr-2018
• Due Date: 08-Jun-2018
• Completion Date: 19-Apr-2018
• Ref Project: EN ISO 2081:2018 - Metallic and other inorganic coatings - Electroplated coatings of zinc with supplementary treatments on iron or steel (ISO 2081:2018)

RELATIONS

• Replaces: SIST EN ISO 2081:2009 - Metallic and other inorganic coatings - Electroplated coatings of zinc with supplementary treatments on iron or steel (ISO 2081:2008)
• Effective Date: 01-May-2018

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 2081:2018
01-maj-2018
1DGRPHãþD
SIST EN ISO 2081:2009
Kovinske in druge anorganske prevleke - Galvanske prevleke cinka z dodatno
obdelavo na železu in jeklu (ISO 2081:2018)

Metallic and other inorganic coatings - Electroplated coatings of zinc with supplementary

treatments on iron or steel (ISO 2081:2018)
Metallische und andere anorganische Überzüge - Galvanische Zinküberzüge auf
Eisenwerkstoffen mit zusätzlicher Behandlung (ISO 2081:2018)

Revêtements métalliques et autres revêtements inorganiques - Dépôts électrolytiques de

zinc avec traitements supplémentaires sur fer ou acier (ISO 2081:2018)
Ta slovenski standard je istoveten z: EN ISO 2081:2018
ICS:
25.220.40 Kovinske prevleke Metallic coatings
SIST EN ISO 2081:2018 en

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

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SIST EN ISO 2081:2018
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SIST EN ISO 2081:2018
EN ISO 2081
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2018
EUROPÄISCHE NORM
ICS 25.220.40 Supersedes EN ISO 2081:2008
English Version
Metallic and other inorganic coatings - Electroplated
coatings of zinc with supplementary treatments on iron or
steel (ISO 2081:2018)

Revêtements métalliques et autres revêtements Metallische und andere anorganische Überzüge -

inorganiques - Dépôts électrolytiques de zinc avec Galvanische Zinküberzüge auf Eisenwerkstoffen mit

traitements supplémentaires sur fer ou acier (ISO zusätzlicher Behandlung (ISO 2081:2018)

2081:2018)
This European Standard was approved by CEN on 15 February 2018.

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, 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

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2081:2018 E

worldwide for CEN national Members.
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SIST EN ISO 2081:2018
EN ISO 2081:2018 (E)
Contents Page

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

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SIST EN ISO 2081:2018
EN ISO 2081:2018 (E)
European foreword

This document (EN ISO 2081:2018) 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, 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 September 2018, and conflicting national standards

shall be withdrawn at the latest by September 2018.

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 2081:2008.

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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 2081:2018 has been approved by CEN as EN ISO 2081:2018 without any modification.

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SIST EN ISO 2081:2018
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SIST EN ISO 2081:2018
INTERNATIONAL ISO
STANDARD 2081
Fourth edition
2018-02
Metallic and other inorganic
coatings — Electroplated coatings of
zinc with supplementary treatments
on iron or steel
Revêtements métalliques et autres revêtements inorganiques —
Dépôts électrolytiques de zinc avec traitements supplémentaires sur
fer ou acier
Reference number
ISO 2081:2018(E)
ISO 2018
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SIST EN ISO 2081:2018
ISO 2081:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 2081:2018
ISO 2081:2018(E)
Contents Page

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

Introduction ..................................................................................................................................................................................................................................v

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

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

3 Terms, definitions, abbreviated terms and symbols ....................................................................................................... 2

3.1 Terms and definitions ....................................................................................................................................................................... 2

3.2 Abbreviated terms ............................................................................................................................................................................... 2

3.3 Symbols ......................................................................................................................................................................................................... 2

4 Information to be supplied by the purchaser to the electroplater ..................................................................2

4.1 Essential information ........................................................................................................................................................................ 2

4.2 Additional information .................................................................................................................................................................... 3

5 Designation ................................................................................................................................................................................................................ 3

5.1 General ........................................................................................................................................................................................................... 3

5.2 Designation specification ............................................................................................................................................................... 3

5.3 Designation of the basis material............................................................................................................................................ 4

5.4 Designation of heat treatment requirements ............................................................................................................... 4

6 Requirements .......................................................................................................................................................................................................... 5

6.1 Appearance ................................................................................................................................................................................................ 5

6.2 Thickness ..................................................................................................................................................................................................... 5

6.3 Trivalent chromium conversion coatings and other supplementary treatments ......................... 5

6.4 Adhesion of zinc and trivalent chromium conversion coatings .................................................................... 5

6.5 Accelerated corrosion testing .................................................................................................................................................... 6

6.5.1 Neutral salt spray test.................................................................................................................................................. 6

6.5.2 Corrosion rating ............................................................................................................................................................... 6

6.6 Stress relief heat treatments before cleaning and metal deposition ........................................................ 6

6.7 Hydrogen-embrittlement-relief heat treatments after electroplating .................................................... 7

7 Sampling ........................................................................................................................................................................................................................ 7

Annex A (normative) Designation of supplementary treatments ......................................................................................... 8

Annex B (normative) Measurement of average thickness of coating on small articles ................................10

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

© ISO 2018 – All rights reserved iii
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SIST EN ISO 2081:2018
ISO 2081:2018(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 on 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 the following

URL: www .iso .org/ iso/ foreword .html.

This document was prepared by the European Committee for Standardization (CEN) Technical

Committee CEN/TC 262, Metallic and other inorganic coatings, in collaboration with ISO Technical

Committee TC 107, Metallic and other inorganic coatings, Subcommittee SC 3, Electrodeposited coatings

and related finishes, in accordance with the agreement on technical cooperation between ISO and CEN

(Vienna Agreement).

This fourth edition cancels and replaces the third edition (ISO 2081:2008), which has been technically

revised. The following main changes have been made:
— the number of normative references has been reduced;
— reference to ASTM B117 has been replaced with ISO 9227;
— some abbreviated terms have been removed;
— coating designations have been modified;
— reference to ISO 1463 for thickness measurement has been increased;
— reference to use of trivalent chromium has been increased
— reference to use of hexavalent chromium has been reduced;

— reference to ISO 19598 in relation to supplementary Cr(VI)-free treatment has been added;

— Tables 1 and 2 have been replaced with a revised Table 1 on neutral salt spray corrosion resistance;

— reference to ISO 15330 in relation to hydrogen embrittlement testing has been added;

— supplementary treatment designations have been modified;
— Annex C has been removed.
iv © ISO 2018 – All rights reserved
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SIST EN ISO 2081:2018
ISO 2081:2018(E)
Introduction

Zinc coatings are applied to iron or steel articles for protective and decorative purposes by

electrodeposition from acid zinc chloride, alkaline non-cyanide zinc, and alkaline zinc cyanide solutions.

Electroplated, bright zinc coatings are popular and the processes for preparing bright zinc coatings are

widely used.

The ability of a zinc coating to prevent corrosion is a function of its thickness and the type of service

conditions to which it is exposed. For example, the rate of corrosion of zinc will generally be greater

in industrial exposures than in rural ones. The type of service condition should, therefore, be taken

into consideration when specifying the minimum coating thickness. Trivalent chromate conversion

coatings and other supplementary treatments enhance the corrosion resistance of electrodeposited

zinc coatings and are commonly applied after electroplating.

Because the appearance and serviceability of zinc coatings depends on the surface condition of the

basis metal, agreement should be reached between the interested parties that the surface finish of the

basis metal is satisfactory for electroplating.

Trivalent chromate conversion coatings are omitted, or replaced by other conversion coatings, at the

specific request of the purchaser. This document provides the codes for all types of chromate conversion

and other supplementary coatings.

With reference to Cr(VI)-free conversion coatings, attention is drawn to ISO 19598. ISO 19598 is

applicable to zinc, zinc-iron and zinc-nickel plating, where only trivalent systems are required.

Due to the REACH Regulations the use of hexavalent chromium compounds will be banned in Europe

from September 2017 except where specifically authorized. Alternative conversion coatings or

substitutes, can be used and are required to satisfy the corrosion requirements given in this document.

Standard designations for metals and alloys can be found in References [12] to [16].

© ISO 2018 – All rights reserved v
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SIST EN ISO 2081:2018
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SIST EN ISO 2081:2018
INTERNATIONAL STANDARD ISO 2081:2018(E)
Metallic and other inorganic coatings — Electroplated
coatings of zinc with supplementary treatments on iron
or steel

WARNING — This document calls for the use of substances and/or procedures that can be injurious

to health if adequate safety measures are not taken. This document does not address any health

hazards, safety or environmental matters associated with its use. It is the responsibility of the

producers, purchasers and/or user of this document to establish appropriate health, safety and

environmentally acceptable practices.
1 Scope

This document specifies requirements for electroplated coatings of zinc with supplementary treatments

on iron or steel. It includes information to be supplied by the purchaser to the electroplater, and the

requirements for heat treatment before and after electroplating.
It is not applicable to zinc coatings applied
— to sheet, strip or wire in the non-fabricated form,
— to close-coiled springs, or
— for purposes other than protective or decorative.

This document does not specify requirements for the surface condition of the basis metal prior to

electroplating with zinc. However, defects in the surface of the basis metal can adversely affect the

appearance and performance of the coating.

The coating thickness that can be applied to threaded components can be limited by dimensional

requirements, including class or fit.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 2819, Metallic coatings on metallic substrates — Electrodeposited and chemically deposited coatings —

Review of methods available for testing adhesion

ISO 3613, Metallic and other inorganic coatings — Chromate conversion coatings on zinc, cadmium,

aluminium-zinc alloys and zinc-aluminium alloys — Test methods

ISO 4519, Electrodeposited metallic coatings and related finishes — Sampling procedures for inspection by

attributes
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
© ISO 2018 – All rights reserved 1
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SIST EN ISO 2081:2018
ISO 2081:2018(E)

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 10289, Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates —

Rating of test specimens and manufactured articles subjected to corrosion tests

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 15330, Fasteners — Preloading test for the detection of hydrogen embrittlement — Parallel bearing

surface method

ISO 15724, Metallic and other inorganic coatings — Electrochemical measurement of diffusible hydrogen in

steels — Barnacle electrode method
3 Terms, definitions, abbreviated terms and symbols
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 2064 and ISO 2080 apply.

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

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.2 Abbreviated terms
ER hydrog
...