ISO 9717
(Main)Metallic and other inorganic coatings — Phosphate conversion coating of metals
Metallic and other inorganic coatings — Phosphate conversion coating of metals
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).
Revêtements métalliques et autres revêtements inorganiques — Couches de conversion au phosphate sur métaux
Le présent document spécifie les exigences relatives aux couches de conversion au phosphate qui sont généralement destinées à être produites sur les matériaux ferreux, l’aluminium, le zinc et leurs alliages (voir l’Annexe B).
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FINAL DRAFT
International
Standard
ISO/FDIS 9717
ISO/TC 107/SC 8
Metallic and other inorganic
Secretariat: KATS
coatings — Phosphate conversion
Voting begins on:
coating of metals
2024-04-04
Revêtements métalliques et autres revêtements inorganiques —
Voting terminates on:
Couches de conversion au phosphate sur métaux
2024-05-30
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
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/CEN PARALLEL PROCESSING 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.
Reference number
ISO/FDIS 9717:2024(en) © ISO 2024
FINAL DRAFT
ISO/FDIS 9717:2024(en)
International
Standard
ISO/FDIS 9717
ISO/TC 107/SC 8
Metallic and other inorganic
Secretariat: KATS
coatings — Phosphate conversion
Voting begins on:
coating of metals
Revêtements métalliques et autres revêtements inorganiques —
Voting terminates on:
Couches de conversion au phosphate sur métaux
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.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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 Reference number
ISO/FDIS 9717:2024(en) © ISO 2024
ii
ISO/FDIS 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/FDIS 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/FDIS 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/FDIS 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
FINAL DRAFT International Standard ISO/FDIS 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/DIS FDIS 9717:2023(E)
ISO /TC 107/SC 8
Date: 2023-02-24
Secretariat: KATS
Date: 2024-03-20
Metallic and other inorganic coatings — Phosphate conversion
coating of metals
Revêtements métalliques et autres revêtements inorganiques — Couches de conversion au phosphate sur
métaux
FDIS stage
ISO/DIS FDIS 9717:2023(E2024(en)
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
EmailE-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii © ISO 2023 – All rights reserved
ii
ISO/DIS FDIS 9717:2023(E2024(en)
Contents
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.3
5.3 Example for designation of phosphate conversion coating .3
6 Requirements .4
6.1 Appearance .4
6.2 Coating mass per unit area .4
6.3 Post treatment .4
6.4 Correlation of coating thickness and area related mass .5
7 Heat treatment .5
Annex A (normative) Determination of phosphate conversion coating resistance to neutral salt spray test .6
Annex B (informative) General information .9
Annex C (informative) Identification of phosphate conversion coating . 12
Bibliography . 14
iii
ISO/DIS FDIS 9717:2023(E2024(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 documentsdocument 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).
Field Code Changed
Attention is drawnISO draws attention to the possibility that some of the elementsimplementation of this
document may beinvolve the subjectuse 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. 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 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.htmlwww.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;
iv © ISO 2023 – All rights reserved
iv
ISO/DIS FDIS 9717:2023(E2024(en)
— 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;
— 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/DIS FDIS 9717:2023(E2024(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.
The International Organization for Standardization (ISO) draws attention to the fact that it is claimed that
compliance with this document may involve the use of a patent.
ISO takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured ISO that he/she is willing to negotiate licences under reasonable
and non-discriminatory terms and conditions with applicants throughout the world. In this respect, the
statement of the holder of this patent right is registered with ISO. Information may be obtained from the patent
database available at www.iso.org/patents.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights other than those in the patent database. ISO shall not be held responsible for identifying any or all such
patent rights.
vi © ISO 2023 – All rights reserved
vi
DRAFT INTERNATIONAL STANDARD ISO/DIS 9717:2023(E)
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);
ISO/DIS FDIS 9717:2023(E2024(en)
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 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
...
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