SIST EN ISO 14713-3:2017
(Main)Zinc coatings - Guidelines and recommendations for the protection against corrosion of iron and steel in structures - Part 3: Sherardizing (ISO 14713-3:2017)
Zinc coatings - Guidelines and recommendations for the protection against corrosion of iron and steel in structures - Part 3: Sherardizing (ISO 14713-3:2017)
This document provides guidelines and recommendations regarding the general principles of design
that are appropriate for articles to be sherardized for corrosion protection.
The protection afforded by the sherardized coating to the article will depend upon the method of
application of the coating, the design of the article and the specific environment to which the article is
exposed. The sherardized article can be further protected by application of additional coatings (outside
the scope of this document), such as organic coatings (wet paints or powder coatings). When applied to
sherardized articles, this combination of coatings is often known as a “duplex system”.
General guidance on this subject can be found in ISO 12944-5 and EN 13438.
The maintenance of corrosion protection in service for steel with sherardized coatings is outside the
scope of this document.
Specific product-related requirements (e.g. for sherardized coatings on fasteners or tubes, etc.) will
take precedence over these general recommendations.
Zinküberzüge - Leitfäden und Empfehlungen zum Schutz von Eisen- und Stahlkonstruktionen vor Korrosion - Teil 3: Sherardisieren (ISO 14713-3:2017)
Dieses Dokument bietet Leitfäden und Empfehlungen für die allgemeinen Grundlagen einer geeigneten Gestaltung von Bauteilen, die zum Schutz gegen Korrosion einen Überzug durch Sherardisieren erhalten.
Der Schutz des Sherardisierungs Überzugs für das Bauteil hängt von dem zum Aufbringen des Überzugs angewendeten Verfahren, der Gestaltung des Bauteolss und der spezifischen Umgebung, dem das Bauteil ausgesetzt wird, ab. Das sherardisierte Bauteil kann durch das nachfolgende Aufbringen zusätzlicher Beschichtungen (die nicht in den Anwendungsbereich dieses Dokumentes fallen) geschützt werden, z. B. durch organische Beschichtungen (Nass Anstrichsysteme oder Pulverbeschichtungen). Bei Anwendung auf sherardisierten Bauteilen ist dieses kombinierte Beschichtungssystem häufig als „Duplex System“ bekannt.
Ein allgemeiner Leitfaden zu diesem Thema kann in ISO 12944 5 und in EN 13438 nachgelesen werden.
In diesem Dokument wird nicht die Instandsetzung des Korrosionsschutzes für Stahl mit Sherardi-sierungs Überzügen unter Einsatzbedingungen erfasst.
Anforderungen, die für ein bestimmtes Produkt gelten (z. B. für sherardisierte Überzüge auf Befestigungs-elementen oder Rohren usw.), haben eine höhere Priorität als die hier angegebenen allgemeinen Empfehlungen.
Revêtements de zinc - Lignes directrices et recommandations pour la protection contre la corrosion du fer et de l'acier dans les constructions - Partie 3: Shérardisation (ISO 14713-3:2017)
ISO 14713-3:2017fournit des lignes directrices et des recommandations concernant les principes généraux de conception appropriés pour les pièces à shérardiser pour leur protection contre la corrosion.
La protection assurée par le revêtement de shérardisation appliqué sur la pièce dépend de la méthode d'application du revêtement, de la conception de la pièce et de l'environnement spécifique auquel la pièce est exposée. La pièce shérardisée peut être encore plus protégée par l'application de revêtements supplémentaires (non couverts par le domaine d'application du présent document), tels que des revêtements organiques (peintures humides ou revêtements poudre). Lorsqu'elle est appliquée aux pièces shérardisées, cette combinaison de revêtements est souvent appelée «système duplex».
Des lignes directrices générales sur ce sujet sont données dans l'ISO 12944‑5 et l'EN 13438.
L'entretien de la protection contre la corrosion en service assurée pour l'acier par des revêtements shérardisés ne relève pas du domaine d'application du présent document.
Des exigences spécifiques relatives aux produits (par exemple pour les revêtements shérardisés sur les tubes et les éléments de fixation, etc.) prévalent sur les présentes recommandations générales.
Cinkove prevleke - Smernice in priporočila za zaščito železnih in jeklenih konstrukcij proti koroziji - 3. del: Šerardiranje (ISO 14713-3:2017)
Ta dokument določa smernice in priporočila glede splošnih načel za projektiranje, ki so primerna za izdelke, ki bodo šerardirani za zaščito proti koroziji.
Zaščita izdelka s šerardirano prevleko je odvisna od metode
nanosa prevleke, projektiranja izdelka in posebnih okoljskih dejavnikov, ki jim je izpostavljen izdelek. Šerardiran izdelek se lahko dodatno zaščiti z nanosom dodatnih prevlek (niso zajete v tem dokumentu), kot so organske prevleke (mokre barve ali praškaste prevleke). Kadar se ta kombinacija prevlek uporabi pri šerardiranih izdelkih, se pogosto imenuje »dvojni sistem«.
Splošne smernice so navedene v standardih ISO 12944-5 in EN 13438.
Vzdrževanje protikorozijske zaščite jekel s šerardiranimi prevlekami ni zajeto v tem dokumentu.
Zahteve, povezane s specifičnimi izdelki (npr. za šerardirane prevleke na pritrdilnih elementih ali ceveh itd.), imajo
prednost pred temi splošnimi priporočili.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 14713-3:2017
01-september-2017
1DGRPHãþD
SIST EN ISO 14713-3:2010
SIST EN ISO 14713-3:2010/AC:2010
&LQNRYHSUHYOHNH6PHUQLFHLQSULSRURþLOD]D]DãþLWRåHOH]QLKLQMHNOHQLK
NRQVWUXNFLMSURWLNRUR]LMLGHO âHUDUGLUDQMH ,62
Zinc coatings - Guidelines and recommendations for the protection against corrosion of
iron and steel in structures - Part 3: Sherardizing (ISO 14713-3:2017)
Zinküberzüge - Leitfäden und Empfehlungen zum Schutz von Eisen- und
Stahlkonstruktionen vor Korrosion - Teil 3: Sherardisieren (ISO 14713-3:2017)
Revêtements de zinc - Lignes directrices et recommandations pour la protection contre
la corrosion du fer et de l'acier dans les constructions - Partie 3: Shérardisation (ISO
14713-3:2017)
Ta slovenski standard je istoveten z: EN ISO 14713-3:2017
ICS:
25.220.40 Kovinske prevleke Metallic coatings
91.080.10 Kovinske konstrukcije Metal structures
91.080.13 Jeklene konstrukcije Steel structures
SIST EN ISO 14713-3:2017 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN ISO 14713-3:2017
---------------------- Page: 2 ----------------------
SIST EN ISO 14713-3:2017
EN ISO 14713-3
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2017
EUROPÄISCHE NORM
ICS 25.220.40 Supersedes EN ISO 14713-3:2009
English Version
Zinc coatings - Guidelines and recommendations for the
protection against corrosion of iron and steel in structures
- Part 3: Sherardizing (ISO 14713-3:2017)
Revêtements de zinc - Lignes directrices et Zinküberzüge - Leitfäden und Empfehlungen zum
recommandations pour la protection contre la Schutz von Eisen- und Stahlkonstruktionen vor
corrosion du fer et de l'acier dans les constructions - Korrosion - Teil 3: Sherardisieren (ISO 14713-3:2017)
Partie 3: Shérardisation (ISO 14713-3:2017)
This European Standard was approved by CEN on 3 May 2017.
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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14713-3:2017 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 14713-3:2017
EN ISO 14713-3:2017 (E)
Contents Page
European foreword . 3
2
---------------------- Page: 4 ----------------------
SIST EN ISO 14713-3:2017
EN ISO 14713-3:2017 (E)
European foreword
This document (EN ISO 14713-3:2017) 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 November 2017, and conflicting national standards
shall be withdrawn at the latest by November 2017.
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 14713-3:2009.
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 14713-3:2017 has been approved by CEN as EN ISO 14713-3:2017 without any
modification.
3
---------------------- Page: 5 ----------------------
SIST EN ISO 14713-3:2017
---------------------- Page: 6 ----------------------
SIST EN ISO 14713-3:2017
INTERNATIONAL ISO
STANDARD 14713-3
Second edition
2017-04
Zinc coatings — Guidelines and
recommendations for the protection
against corrosion of iron and steel in
structures —
Part 3:
Sherardizing
Revêtements de zinc — Lignes directrices et recommandations
pour la protection contre la corrosion du fer et de l’acier dans les
constructions —
Partie 3: Shérardisation
Reference number
ISO 14713-3:2017(E)
©
ISO 2017
---------------------- Page: 7 ----------------------
SIST EN ISO 14713-3:2017
ISO 14713-3:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 14713-3:2017
ISO 14713-3:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Design for sherardizing . 2
4.1 General . 2
4.2 Surface preparation . 2
4.3 Design considerations. 3
4.4 Clearances of threaded components . 3
5 Storage and transport . 4
5.1 General . 4
5.2 Recommendations for storage and transport . 4
6 Effects of article condition on quality of sherardizing . 4
6.1 Composition . 4
6.2 Surface condition . 4
6.3 Influence of steel surface roughness on the sherardized coating thickness . 5
6.4 Internal stresses in the base material . 5
6.4.1 General. 5
6.4.2 Distortion cracking . 5
6.4.3 Hydrogen embrittlement . 6
6.5 Large objects and thick steels . 6
7 Effect of sherardizing process on the article . 6
7.1 Processing circumstances . 6
7.2 Coating properties influenced by the sherardizing process . 6
7.2.1 Sherardizing practice . 6
7.2.2 Surface properties of the finished article . 6
8 After-treatments . 7
Bibliography . 8
© ISO 2017 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 14713-3:2017
ISO 14713-3:2017(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: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings,
Subcommittee SC 4, Hot dip coatings (galvanized, etc.).
This second edition cancels and replaces the first edition (ISO 14713-3:2009), of which it constitutes a
minor revision following the publication of ISO 17668 with the following changes:
— ISO 17668 has replaced EN 13811;
— Table 1 has been amended to align coating classes with ISO 17668.
A list of all parts in the ISO 14713 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 14713-3:2017
ISO 14713-3:2017(E)
Introduction
Sherardizing is a thermal diffusion process in which articles are heated in the presence of a sherardizing
mixture consisting of zinc dust with or without an inert material.
The process is carried out in a slowly rotating closed container at temperatures ranging from about
300 °C to 500 °C. The normal processing temperature is below the melting point of zinc (419 °C).
During the process, zinc/iron alloys are built up on the surface of the ferrous articles. A coating
thickness of 10 µm to 75 µm (and higher if required) can be achieved. The coating thickness is accurately
controlled by the amount of zinc dust, the processing time and temperature. The coating closely follows
the contours of the basis material, and uniform coatings are produced on articles, including those of
irregular shape.
After sherardizing, the containers are cooled down. A screening process separates the sherardized
articles from the unused sherardizing mixture. The articles, with the zinc/iron-alloyed layer, are
normally post-treated by phosphating, chromating or another suitable passivation process (conversion
coating) resulting in a dust-free and clean passivated surface.
Most steel and iron articles can be sherardized.
© ISO 2017 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 14713-3:2017
---------------------- Page: 12 ----------------------
SIST EN ISO 14713-3:2017
INTERNATIONAL STANDARD ISO 14713-3:2017(E)
Zinc coatings — Guidelines and recommendations for
the protection against corrosion of iron and steel in
structures —
Part 3:
Sherardizing
1 Scope
This document provides guidelines and recommendations regarding the general principles of design
that are appropriate for articles to be sherardized for corrosion protection.
The protection afforded by the sherardized coating to the article will depend upon the method of
application of the coating, the design of the article and the specific environment to which the article is
exposed. The sherardized article can be further protected by application of additional coatings (outside
the scope of this document), such as organic coatings (wet paints or powder coatings). When applied to
sherardized articles, this combination of coatings is often known as a “duplex system”.
General guidance on this subject can be found in ISO 12944-5 and EN 13438.
The maintenance of corrosion protection in service for steel with sherardized coatings is outside the
scope of this document.
Specific product-related requirements (e.g. for sherardized coatings on fasteners or tubes, etc.) will
take precedence over these general recommendations.
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 8044, Corrosion of metals and alloys — Basic terms and definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8044 and the following 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
3.1
sherardizing
thermal diffusion process in which articles are heated in close contact with a sherardizing mixture,
consisting of zinc dust with or without an inert material, in a closed container, usually rotated
© ISO 2017 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 14713-3:2017
ISO 14713-3:2017(E)
3.2
s
...
SLOVENSKI STANDARD
oSIST prEN ISO 14713-3:2017
01-februar-2017
&LQNRYHSUHYOHNH6PHUQLFHLQSULSRURþLOD]D]DãþLWRåHOH]QLKLQMHNOHQLK
NRQVWUXNFLMSURWLNRUR]LMLGHO âHUDUGLUDQMH ,62)',6
Zinc coatings - Guidelines and recommendations for the protection against corrosion of
iron and steel in structures - Part 3: Sherardizing (ISO/FDIS 14713-3:2016)
Zinküberzüge - Leitfäden und Empfehlungen zum Schutz von Eisen- und
Stahlkonstruktionen vor Korrosion - Teil 3: Sherardisieren (ISO/FDIS 14713-3:2016)
Revêtements de zinc - Lignes directrices et recommandations pour la protection contre
la corrosion du fer et de l'acier dans les constructions - Partie 3: Shérardisation
(ISO/FDIS 14713-3:2016)
Ta slovenski standard je istoveten z: prEN ISO 14713-3
ICS:
25.220.40 Kovinske prevleke Metallic coatings
91.080.10 Kovinske konstrukcije Metal structures
91.080.13 Jeklene konstrukcije Steel structures
oSIST prEN ISO 14713-3:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 14713-3:2017
---------------------- Page: 2 ----------------------
oSIST prEN ISO 14713-3:2017
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 14713-3
ISO/TC 107/SC 4
Zinc coatings — Guidelines and
Secretariat: BSI
recommendations for the protection
Voting begins on:
2016-12-11 against corrosion of iron and steel in
structures —
Voting terminates on:
2017-03-05
Part 3:
Sherardizing
Revêtements de zinc — Lignes directrices et recommandations
pour la protection contre la corrosion du fer et de l’acier dans les
constructions —
Partie 3: Shérardisation
ISO/CEN PARALLEL PROCESSING
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 14713-3:2016(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2016
---------------------- Page: 3 ----------------------
oSIST prEN ISO 14713-3:2017
ISO/FDIS 14713-3:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 14713-3:2017
ISO/FDIS 14713-3:2016(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Design for sherardizing . 2
4.1 General . 2
4.2 Surface preparation . 2
4.3 Design considerations. 3
4.4 Clearances of threaded components . 3
5 Storage and transport . 4
5.1 General . 4
5.2 Recommendations for storage and transport . 4
6 Effects of article condition on quality of sherardizing . 4
6.1 Composition . 4
6.2 Surface condition . 4
6.3 Influence of steel surface roughness on the sherardized coating thickness . 5
6.4 Internal stresses in the base material . 5
6.4.1 General. 5
6.4.2 Distortion cracking . 5
6.4.3 Hydrogen embrittlement . 6
6.5 Large objects and thick steels . 6
7 Effect of sherardizing process on the article . 6
7.1 Processing circumstances . 6
7.2 Coating properties influenced by the sherardizing process . 6
7.2.1 Sherardizing practice . 6
7.2.2 Surface properties of the finished article . 6
8 After-treatments . 7
Bibliography . 8
© ISO 2016 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 14713-3:2017
ISO/FDIS 14713-3:2016(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 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.
The committee responsible for this document is ISO/TC 107, Metallic and other inorganic coatings,
Subcommittee SC 4, Hot dip coatings (galvanized, etc.).
This second edition cancels and replaces the first edition (ISO 14713-3:2009), of which it constitutes a
minor revision following the publication of ISO 17668 with the following changes:
— ISO 17688 has replaced EN 13811;
— Table 1 has been amended to align coating classes with ISO 17688.
A list of all parts in the ISO 14713 series can be found on the ISO website.
iv © ISO 2016 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 14713-3:2017
ISO/FDIS 14713-3:2016(E)
Introduction
Sherardizing is a thermal diffusion process in which articles are heated in the presence of a sherardizing
mixture consisting of zinc dust with or without an inert material.
The process is carried out in a slowly rotating closed container at temperatures ranging from about
300 °C to 500 °C. The normal processing temperature is below the melting point of zinc (419 °C).
During the process, zinc/iron alloys are built up on the surface of the ferrous articles. A coating
thickness of 10 µm to 75 µm (and higher if required) can be achieved. The coating thickness is accurately
controlled by the amount of zinc dust, the processing time and temperature. The coating closely follows
the contours of the basis material, and uniform coatings are produced on articles, including those of
irregular shape.
After sherardizing, the containers are cooled down. A screening process separates the sherardized
articles from the unused sherardizing mixture. The articles, with the zinc/iron-alloyed layer, are
normally post-treated by phosphating, chromating or another suitable passivation process (conversion
coating) resulting in a dust-free and clean passivated surface.
Most steel and iron articles can be sherardized.
© ISO 2016 – All rights reserved v
---------------------- Page: 7 ----------------------
oSIST prEN ISO 14713-3:2017
---------------------- Page: 8 ----------------------
oSIST prEN ISO 14713-3:2017
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 14713-3:2016(E)
Zinc coatings — Guidelines and recommendations for
the protection against corrosion of iron and steel in
structures —
Part 3:
Sherardizing
1 Scope
This document provides guidelines and recommendations regarding the general principles of design
that are appropriate for articles to be sherardized for corrosion protection.
The protection afforded by the sherardized coating to the article will depend upon the method of
application of the coating, the design of the article and the specific environment to which the article is
exposed. The sherardized article can be further protected by application of additional coatings (outside
the scope of this document), such as organic coatings (wet paints or powder coatings). When applied to
sherardized articles, this combination of coatings is often known as a “duplex system”.
General guidance on this subject can be found in ISO 12944-5 and EN 13438.
The maintenance of corrosion protection in service for steel with sherardized coatings is outside the
scope of this document.
Specific product-related requirements (e.g. for sherardized coatings on fasteners or tubes, etc.) will
take precedence over these general recommendations.
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 8044, Corrosion of metals and alloys — Basic terms and definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8044 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
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3.1
sherardizing
thermal diffusion process in which articles are heated in close contact with a sherardizing mixture,
consisting of zinc dust with or without an inert material, in a closed container, usually rotated
© ISO 2016 – All rights reserved 1
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oSIST prEN ISO 14713-3:2017
ISO/FDIS 14713-3:2016(E)
3.2
sherardized coating
coating consisting of zinc/iron alloys obtained by the sherardizing process, and normally post-treated
by phosphating, chromating or another suitable passivating process (conversion coating)
Note 1 to entry: “Sherardized coating” is referred to in this document as “coating”.
4 Design for sherardizing
4.1 General
It is essential that the design of any article required to be finished should take into account not only the
function of the article and its method of manufacture but also the limitations imposed by the finish.
Sherardizing is a process developed to protect components of various sizes, but mainly small articles,
against corrosion and wear. No jig marks are visible after sherardizing. Normal sherardizing equipment
has containers with nominal dimensions of 2 000 mm × 480 mm × 400 mm. Specialized equipment has
been developed to treat large tubes for the gas and oil industry and large articles of complex shape for
the automotive industry.
Some internal stresses in the articles to be sherardized will be relieved during the sherardizing process
and this may cause deformation of the coated article. Normally, the sherardizing is carried out between
320 °C and 419 °C.
The purchaser should seek the advice of the sherardizer before designing or manufacturing a product
that is subsequently to be sherardized, as it may be necessary to adapt the construction of the article
for the sherardizing process, especially when very fragile components are sent for sherardizing. These
components may be liable to damage and distortion during processing. The sherardizer may be able to
recommend a design modification.
4.2 Surface preparation
The design and the materials used should permit good surface preparation. This is essential for the
production of a high-quality coating. Sherardizing is only effective on surfaces free of oil, g
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