Zinc diffusion coatings on ferrous products - Sherardizing - Specification (ISO 17668:2016)

This ISO standard specifies minimum thickness requirements for six classes of zinc coating applied to ferrous products by the sherardizing process for the purpose of protection against corrosion and wear. It also specifies the minimum requirements of the zinc dust to be used in the sherardizing process. This standard does not specifiy any requirements for the surface condition (finish or roughness) of the basis material before sherardizing.
After-treatments or organic over-coatings of sherardized articles are not in the scope of this standard. This standard does not apply to sherardized products (e.g. fasteners, tubes) for which specific standards exist and which may include additional requirements or requirements which are different from those of this standard.
NOTE Individual product standards can incorporate this standard for the coating by quoting its number, or may incorporate it with modification specific to the product.

Zink-Diffusionsbeschichtungen auf Eisen - Sherardisieren - Anforderungen (ISO 17668:2016)

Diese ISO-Norm legt die Anforderungen an die Mindestschichtdicke für sechs Klassen von Zinküberzügen, die zum Schutz vor Korrosion und Verschleiß mithilfe des Sherardisierungsverfahrens auf Eisenwerkstoffe aufgebracht wurden, fest.
Diese Norm legt keine Anforderungen an den Zustand der Oberfläche (Oberflächenbeschaffenheit oder Rauheit) des Grundwerkstoffs vor dem Sherardisieren fest.
Nachbehandlungen (Konversionsschichten), nachträgliche Behandlungen oder organische Beschichtungen (Duplex-Systeme) von sherardisierten Bauteilen werden von der vorliegenden Norm nicht erfasst.
ANMERKUNG   Allgemeine Informationen zu den Nachbehandlungen sind Anhang C und Anhang D zu entnehmen.
Die vorliegende Norm gilt nicht für sherardisierte Produkte (z. B. Befestigungselemente, Rohre), für die es besondere Normen gibt und für die zusätzliche Anforderungen oder von dieser Norm abweichende Anforderungen gelten.
ANMERKUNG   Einzelne Produktnormen können durch Angabe der Nummer auf die vorliegende Norm für Überzüge verweisen oder dürfen sie mit produktspezifischen Modifikationen integrieren.

Revêtements par diffusion de zinc sur les produits ferreux - Shérardisation - Spécification (ISO 17668:2016)

ISO 17668:2016 spécifie les exigences relatives à l'épaisseur minimale de six classes de couches par diffusion de zinc appliquées aux produits ferreux selon le procédé de shérardisation en vue de fournir une protection contre la corrosion et l'usure.
ISO 17668:2016 ne spécifie aucune exigence relative à l'état de surface (fini ou rugosité) du matériau de base avant shérardisation.
Les post-traitements (couches de conversion), les traitements subséquents ou les revêtements organiques (systèmes Duplex) appliqués aux pièces shérardisées ne relèvent pas du domaine d'application de la présente Norme internationale.
NOTE 1 Pour des informations générales sur les post-traitements, voir l'Annexe C et l'Annexe D.
ISO 17668:2016 ne s'applique pas aux produits shérardisés (tels que les éléments de fixation, les tubes, etc.) pour lesquels des normes spécifiques existent et sont susceptibles de comporter des exigences supplémentaires ou des exigences différentes de celles définies dans la présente Norme internationale.
NOTE 2 En ce qui concerne les revêtements, une norme de produit peut référencer la présente Norme internationale en citant son numéro complet ou peut l'intégrer à son corps de texte en apportant les modifications spécifiques au produit.

Cinkove difuzijske prevleke na železovih izdelkih - Šeradiranje - Specifikacija (ISO 17668:2016)

Ta standard ISO določa minimalne zahteve za debelino za šest razredov cinkove prevleke, uporabljene za železove izdelke po postopku šeradiranja za zaščito pred korozijo in obrabo. Določa tudi minimalne zahteve za cinkov prah, ki se uporablja v postopku šeradiranja. Ta standard ne določa zahtev za stanje površine (zaključno ali hrapavo) osnovnega materiala pred šeradiranjem. Ta standard ne zajema naknadne obdelave ali organskih premazov šeradiranih izdelkov. Ta standard se ne uporablja za šeradirane izdelke (npr. vezne elemente, cevi), za katere obstajajo posebni standardi, ki lahko vključujejo dodatne zahteve ali zahteve, ki se razlikujejo od tistih iz tega standarda. OPOMBA: Standardi za posamezne izdelke lahko vključujejo določbe tega standarda za prevleko z navedbo njegove številke ali s spremembami, ki so posebej prilagojene izdelku.

General Information

Status
Published
Public Enquiry End Date
05-Oct-2014
Publication Date
21-Mar-2016
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
16-Mar-2016
Due Date
21-May-2016
Completion Date
22-Mar-2016

RELATIONS

Buy Standard

Standard
SIST EN ISO 17668:2016
English language
21 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 17668:2016
01-maj-2016
1DGRPHãþD
SIST EN 13811:2003

Cinkove difuzijske prevleke na železovih izdelkih - Šeradiranje - Specifikacija (ISO

17668:2016)
Zinc diffusion coatings on ferrous products - Sherardizing - Specification (ISO
17668:2016)
Zink-Diffusionsbeschichtungen auf Eisen - Sherardisieren - Anforderungen (ISO
17668:2016)

Revêtements par diffusion de zinc sur les produits ferreux - Shérardisation - Spécification

(ISO 17668:2016)
Ta slovenski standard je istoveten z: EN ISO 17668:2016
ICS:
25.220.40 Kovinske prevleke Metallic coatings
77.120.60 Svinec, cink, kositer in Lead, zinc, tin and their
njihove zlitine alloys
SIST EN ISO 17668:2016 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 17668:2016
---------------------- Page: 2 ----------------------
SIST EN ISO 17668:2016
EN ISO 17668
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2016
EUROPÄISCHE NORM
ICS 25.220.40 Supersedes EN 13811:2003
English Version
Zinc diffusion coatings on ferrous products - Sherardizing -
Specification (ISO 17668:2016)

Revêtements par diffusion de zinc sur les produits Zink-Diffusionsüberzüge auf Eisen - Sherardisieren -

ferreux - Shérardisation - Spécification (ISO Anforderungen (ISO 17668:2016)
17668:2016)
This European Standard was approved by CEN on 2 January 2016.

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

© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17668:2016 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 17668:2016
EN ISO 17668:2016 (E)
Contents Page

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

---------------------- Page: 4 ----------------------
SIST EN ISO 17668:2016
EN ISO 17668:2016 (E)
European foreword

This document (EN ISO 17668:2016) 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 September 2016, and conflicting national standards

shall be withdrawn at the latest by September 2016.

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 13811:2003.

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 17668:2016 has been approved by CEN as EN ISO 17668:2016 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 17668:2016
---------------------- Page: 6 ----------------------
SIST EN ISO 17668:2016
INTERNATIONAL ISO
STANDARD 17668
First edition
2016-02-01
Zinc diffusion coatings on ferrous
products — Sherardizing —
Specification
Revêtements par diffusion de zinc sur les produits ferreux —
Shérardisation — Spécification
Reference number
ISO 17668:2016(E)
ISO 2016
---------------------- Page: 7 ----------------------
SIST EN ISO 17668:2016
ISO 17668:2016(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: 8 ----------------------
SIST EN ISO 17668:2016
ISO 17668:2016(E)
Contents Page

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

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

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

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

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General requirements ..................................................................................................................................................................................... 3

4.1 Surface condition base material ............................................................................................................................................... 3

4.2 Information to be supplied by the purchaser ............................................................................................................... 3

5 Acceptance inspection and sampling .............................................................................................................................................. 3

6 Coating properties .............................................................................................................................................................................................. 4

6.1 Appearance ................................................................................................................................................................................................ 4

6.2 Thickness ..................................................................................................................................................................................................... 4

6.2.1 General...................................................................................................................................................................................... 4

6.2.2 Test methods ....................................................................................................................................................................... 4

6.2.3 Reference areas ................................................................................................................................................................. 5

6.2.4 Magnetic method or electro-magnetic method ..................................................................................... 5

6.2.5 Gravimetric method ...................................................................................................................................................... 5

6.2.6 Thickness requirements ............................................................................................................................................ 5

6.3 Acceptance criteria .............................................................................................................................................................................. 6

6.4 Additional clearances for threaded components ...................................................................................................... 6

7 Ceritificate of compliance ........................................................................................................................................................................... 6

Annex A (normative) Information to be supplied by the purchaser to the sherardizer .................................7

Annex B (informative) Determination of thickness .............................................................................................................................. 8

Annex C (informative) General information ..............................................................................................................................................10

Annex D (informative) Corrosion resistance of sherardized layers ..................................................................................12

Bibliography .............................................................................................................................................................................................................................13

© ISO 2016 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 17668:2016
ISO 17668:2016(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 WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.

The committee responsible for this document is ISO/TC 107, Metallic and other inorganic coatings,

Subcommittee SC 4, Hot dip coatings (galvanized, etc.).
iv © ISO 2016 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 17668:2016
ISO 17668:2016(E)
Introduction

Sherardizing is a thermal diffusion coating process in which ferrous articles are heated in the presence

of a sherardizing mixture consisting of zinc dust with or without an inert material.

The process is commonly performed in closed, slowly rotating or fixed containers at temperatures

ranging from around 300 °C to 500 °C. The normal processing temperature is below the melting point

of zinc (419 °C).

During the process, zinc reacts with the surface to form inter-metallic layers on 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, processing time and temperature. The coating closely

follows the contours of the base material and uniform coating thicknesses are produced on articles,

including those of irregular shape.

After sherardizing, the container load is cooled down. A screening process separates the sherardized

articles from the unused sherardizing mixture. The articles, with the zinc-iron inter-metallic layers, are

eventually post-treated (by phosphating, chromating or another suitable passivation process) resulting

in a clean and passivated surface.

It is common to use articles coated with zinc-iron inter-metallic layers as a primer or base-coat for

duplex-systems.

For additional information about the sherardizing process and the application possibilities of

sherardized articles, see Reference [12] and Reference [13].
Sherardizing (thermal diffusion coating) is also known as the following:
— diffusion zinc plating (Germany);
— thermal diffusion coating (Russia);
— thermal diffusion galvanizing (Ukraine);
— vapour galvanizing (UK);
— zinc diffusion coating (USA);
— zinc inter-metallic coating (Russia);
— zinc thermo diffusion galvanizing (Israel).

In China, Europe and the USA, the common name for the thermal diffusion coating process is

sherardizing.
© ISO 2016 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 17668:2016
---------------------- Page: 12 ----------------------
SIST EN ISO 17668:2016
INTERNATIONAL STANDARD ISO 17668:2016(E)
Zinc diffusion coatings on ferrous products — Sherardizing
— Specification
1 Scope

This International Standard specifies minimum thickness requirements for six classes of zinc diffusion

layers applied to ferrous products by the sherardizing process for the purpose of protection against

corrosion and wear.

This International Standard does not specify any requirements for the surface condition (finish or

roughness) of the basis material before sherardizing.

Post-treatments (conversion coatings), after-treatments or organic over-coatings (Duplex) of

sherardized articles are not in the scope of this International Standard.
NOTE 1 For general information about post-treatments, see Annex C and Annex D.

This International Standard does not apply to sherardized products (e.g. fasteners, tubes) for which

specific standards exist and which might include additional requirements or requirements which are

different from those of this International Standard.

NOTE 2 Individual product standards can incorporate this International Standard for the coating by quoting

its number, or can incorporate it with modification specific to the product.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 1460, Metallic coatings — Hot dip galvanized coatings on ferrous materials — Gravimetric

determination of the mass per unit area

ISO 2064, Metallic and other inorganic coatings — Definitions and conventions concerning the

measurement of thickness

ISO 2178, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness —

Magnetic method
ISO 2808, Paints and varnishes — Determination of film thickness
ISO 10474, Steel and steel products — Inspection documents
3 Terms and definitions

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

3.1
sherardizing process

zinc diffusion coating process in which articles are heated in close contact with a sherardizing mixture

(3.3), commonly performed in a closed slowly rotating container or a fixed (non-rotating) container, to

form sherardized layers (3.2)
© ISO 2016 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 17668:2016
ISO 17668:2016(E)
3.2
sherardized layer
zinc diffusion layer

zinc diffusion coating consisting of zinc-iron alloy layers obtained by sherardizing

Note 1 to entry: The “sherardized layer” is referred to in this International Standard as “coating”.

Note 2 to entry: The sherardized layer may subsequently be post-treated by phosphating, chromating or another

suitable passivation process (guidance for these post-treatments are given in Annex C and Annex D).

3.3
sherardizing mixture

mixture consisting of mainly zinc dust, with or without other process-supporting ingredients

Note 1 to entry: Zinc dust is also known as zinc powder.
3.4
mass of the zinc diffusion layer
total mass of zinc/iron alloys per unit area of surface

Note 1 to entry: The mass of the zinc diffusion layer is expressed in grams per square metre (g/m ).

3.5
thickness of the zinc diffusion layer
total zinc diffusion layer thickness consisting of zinc/iron alloys

Note 1 to entry: The thickness of the zinc diffusion layer is expressed in micrometre (µm).

3.6
significant surface

part of the article covered or to be covered by the zinc diffusion layer (3.2) and for which these coating is

essential for serviceability and/or appearance and where the layer will meet all the specified requirements

3.7
control sample
article, or group of articles, from a lot which is selected for testing
3.8
reference area

area within which a specified number of single measurements is required to be made

3.9
local thickness of the zinc diffusion layer

mean value of zinc diffusion layer thickness obtained from the specific number of measurements within

a reference area (3.8) for a magnetic or electro-magnetic test or the single value of a gravimetric test

Note 1 to entry: Guidance for the methods of measurement of the zinc diffusion layer thickness is given in

6.2.2 and Annex B.
3.10
mean thickness of the zinc diffusion layer

average value of the local zinc diffusion layer thicknesses of different reference areas (3.8)

Note 1 to entry: In case there is only one reference area (3.8), the mean zinc diffusion layer thickness is the same

as the local zinc diffusion layer thickness.
3.11
inspection lot

one or more articles of the same type and size comprising either a single order, a single delivery load or

the number of articles identified as a lot by the sherardizer
2 © ISO 2016 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 17668:2016
ISO 17668:2016(E)
3.12
acceptance inspection

inspection of an inspection lot (3.11) at the sherardizer’s works (unless otherwise specified)

4 General requirements
4.1 Surface condition base material
The surface of the base material should be clean before sherardizing.

Surface contamination that cannot be removed by grit blasting should be removed prior to the

mechanical pre-treatment process. The responsibility of removing the contamination should be agreed

upon between the sherardizer and purchaser.

The surface condition of the base material, the mass of the parts and the sherardizing conditions can

affect the appearance, the thickness, surface roughness and the physical and mechanical properties of

the coating. This International Standard does not define any requirements regarding these properties.

NOTE Guidance on these parameters can be found in ISO 14713-3:2009, Clause 4.
4.2 Information to be supplied by the purchaser
Information shall be supplied by the purchaser in accordance with A.1 and A.2.
5 Acceptance inspection and sampling

Acceptance inspection shall be undertaken before the products leave the sherardizer’s custody, unless

otherwise specified at the time of ordering by the purchaser.

Acceptance inspection involves the assessment of appearance of the coated article and testing the

thickness. The results of other tests of the coated article are normally not provided. Other tests will

only be carried out by agreement between purchaser and sherardizer made at the time of ordering.

A control sample for thickness testing shall be taken randomly from each inspection lot selected for

testing. The minimum number of articles to form the control sample shall be taken in accordance

with Table 1.

Alternatively, sampling procedures selected from ISO 2859-1, ISO 2859-2, and ISO 2859-3 can be used.

Table 1 — Control sample size related to batch size
Number of articles in the Minimum number of
batch articles in the control
sample
1 to 3 All
4 to 500 3
501 to 1 200 5
1 201 to 3 200 8
3 201 to 10 000 13
Above 10 000 20
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.