SIST EN ISO 9717:2024

SLOVENSKI STANDARD
01-september-2024
Kovinske in druge anorganske prevleke - Fosfatne prevleke na kovinah (ISO
9717:2024)
Metallic and other inorganic coatings - Phosphate conversion coating of metals (ISO
9717:2024)
Metallische und andere anorganische Überzüge - Phosphatumwandlungsüberzüge auf
Metallen (ISO 9717:2024)
Revêtements métalliques et autres revêtements inorganiques - Couches de conversion
au phosphate sur métaux (ISO 9717:2024)
Ta slovenski standard je istoveten z: EN ISO 9717:2024
ICS:
25.220.20 Površinska obdelava Surface treatment
25.220.40 Kovinske prevleke Metallic coatings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 9717
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2024
EUROPÄISCHE NORM
ICS 25.220.20 Supersedes EN ISO 9717:2017
English Version
Metallic and other inorganic coatings - Phosphate
conversion coating of metals (ISO 9717:2024)
Revêtements métalliques et autres revêtements Metallische und andere anorganische Überzüge -
inorganiques - Couches de conversion au phosphate Phosphatumwandlungsüberzüge auf Metallen (ISO
sur métaux (ISO 9717:2024) 9717:2024)
This European Standard was approved by CEN on 30 June 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9717:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 9717:2024) 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 January 2025, and conflicting national standards shall
be withdrawn at the latest by January 2025.
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 9717:2017.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 9717:2024 has been approved by CEN as EN ISO 9717:2024 without any modification.

International
Standard
ISO 9717
Fourth edition
Metallic and other inorganic
2024-07
coatings — Phosphate conversion
coating of metals
Revêtements métalliques et autres revêtements inorganiques —
Couches de conversion au phosphate sur métaux
Reference number
ISO 9717:2024(en) © ISO 2024
ISO 9717:2024(en)
© ISO 2024
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
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 9717:2024(en)
Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Information to be supplied by the purchaser to the processor . 1
5 Coating types and their importance . 2
5.1 Coating types .2
5.2 Designation of phosphate conversion coating .2
5.3 Example for designation of phosphate conversion coating .3
6 Requirements . 3
6.1 Appearance .3
6.2 Coating mass per unit area .3
6.3 Post treatment .3
6.4 Correlation of coating thickness and area related mass .4
7 Heat treatment . 4
Annex A (normative) Determination of phosphate conversion coating resistance to neutral salt
spray test . 5
Annex B (informative) General information . 8
Annex C (informative) Identification of phosphate conversion coating .11
Bibliography .13

iii
ISO 9717:2024(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of 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 www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings,
Subcommittee SC 8, Chemical conversion coatings, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 262, Metallic and other inorganic coatings, including for
corrosion protection and corrosion testing of metals and alloys, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 9717:2017), which has been technically
revised.
The main changes are as follows:
— the introduction has been clarified (1 bracket shifted);
— 5.1 Table 1 formatted and for Znph second line added to describe types of Znph; new Table 1 copied on
Table C.1
— 5.2 and ff.: all terms are uniformed from “phosphate coating” or “conversion coating” to “phosphate
conversion coating” (when applicable);
— 5.2 and ff.: “after-treatment” was changed to “post treatment”; other definitions and spelling changed
according to ISO 2080;
— 6.3 Table 2: definition of T1 recharged, second sentence deleted (this is content of T2);
— 6.3: last sentence updated to describe impact of neutral salt spray test;
— 6.4: revision of 6.4, thickness measurement replaced by area related mass;
— Annex B: last sentence of B.1 deleted: Table B.1 updated;
— Annex B: Table B.1 and B.3 headlines updated;
— Annex B: Table B.4 headline updated;

iv
ISO 9717:2024(en)
— Annex C: the element nickel has been added to C.1, C.2.3, C.2.5 and C.4; ICP was added as method to C.2.3;
XRF was added as method to C.3.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

v
ISO 9717:2024(en)
Introduction
Phosphate conversion coatings are produced by treating substrates with appropriate solutions. The main
constituents of these solutions are the appropriate dihydrogen orthophosphates.
They are intended to
— impart corrosion resistance,
— improve adhesion to paints and other organic finishes,
— facilitate cold-forming operations, such as wire drawing, tube drawing and extrusion, and
— modify surface frictional properties to facilitate sliding.
Phosphate conversion coatings are produced by treatment with solutions, the main constituents of which are
the appropriate dihydrogen orthophosphates. These phosphate conversion coatings are applied principally
to ferrous materials and zinc, and differ in coating mass per unit area and apparent density, depending on
— the construction material and surface condition of the components,
— previous mechanical and chemical treatment of the components, and
— processing conditions for phosphating.
All phosphate conversion coatings are crystalline and porous but can be sealed substantially by subsequent
sealant processes.
vi
International Standard ISO 9717:2024(en)
Metallic and other inorganic coatings — Phosphate
conversion coating of metals
WARNING — This document calls for the use of substances and/or procedures that could 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 users of this document to establish appropriate health, safety and
environmentally acceptable practices and take appropriate actions.
1 Scope
This document specifies the requirements for phosphate conversion coatings which are usually destined for
application on ferrous materials, aluminium, zinc, and their alloys (see Annex B).
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 2080, Metallic and other inorganic coatings — Surface treatment, metallic and other inorganic coatings —
Vocabulary
ISO 3892, Conversion coatings on metallic materials — Determination of coating mass per unit area —
Gravimetric 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 9588, Metallic and other inorganic coatings — Post-coating treatments of iron or steel to reduce the risk of
hydrogen embrittlement
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2080 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Information to be supplied by the purchaser to the processor
The following information shall be provided by the purchaser:
a) a description of the phosphate conversion coating according to this document, i.e., ISO 9717 (see 5.2);
b) in cases of phosphating steel parts with tensile strength ≥ 1 000 MPa, also in locally restricted areas
(e.g. for case-hardened or cold-formed structures or in weld seam areas) the safety against brittle
fracture (hydrogen embrittlement) is of primary importance. The phosphating process shall be carried

ISO 9717:2024(en)
out in such a manner that a risk of hydrogen embrittlement is kept to a minimum. Appropriate measures
to minimize the risk of hydrogen embrittlement shall be specified by the purchaser and applied by the
supplier. Any heat treatment in accordance with specifications or recommendations cannot ensure
complete prevention of hydrogen embrittlement. The effectiveness of a heat treatment, if any, shall be
verified by the supplier;
c) the sampling procedure, the acceptable quality limit or any other requirements and tests that deviate
from ISO 4519;
d) the surface treatment or phosphating;
e) the desired appearance of the treated surface;
f) the desired corrosion resistance;
g) the quality appearance and surface condition of the basis metal, if any, if these properties affect the
performance and/or appearance of phosphate conversion coatings;
h) where applicable, technical measures to minimize the risk of hydrogen embrittlement as specified by
the purchaser.
5 Coating types and their importance
5.1 Coating types
The phosphate conversion coating shall be designated in accordance with Table 1.
Table 1 — Designation of phosphate conversion coatings
Elements present in phosphate con-
Coating type
version coating
Iron (II) Feph
Manganese Mnph
Zinc (no Calcium)
Znph
Zinc and Mn, Ni, Fe(II) (no Calcium)
Zinc and Calcium ZnCaph
Zinc, Mn and Ni Triph
There are various phosphate conversion coating types of zinc phosphate that are altered because of the
build-in of iron and/or nickel and/or manganese. This altered metal is usually present as a double salt, such
as Zn ME(PO ) × 4 H O, whereby ME can be Fe(II), Ni and/or Mn. Zn will continue to be the main metal
2 4 2 2
element of those phosphate conversion coatings, which do not have separate markings in order to avoid
confusion. It should also be noted that metal taken from the basis material is included in the phosphate
conversion coating.
Information for phosphate conversion coating characteristics can be found in Annex B and the identification
methods can be found in Annex C.
5.2 Designation of phosphate conversion coating
The designation of the phosphate conversion coating shall consist of the following information.
a) number of this document, i.e., ISO 9717, and the designation “phosphate conversion coating”;
b) followed by a hyphen (–);
c) designation of the metal layer the phosphate layer will be applied upon: by means of the material
chemical symbol (or the symbol of the primary alloy components);

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