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ISO 9717:2024(en)
ISO - Cover page
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Information to be supplied by the purchaser to the processor
5 Coating types and their importance
 5.1 Coating types
 5.2 Designation of phosphate conversion coating
 5.3 Example for designation of phosphate conversion coating
6 Requirements
 6.1 Appearance
 6.2 Coating mass per unit area
 6.3 Post treatment
 6.4 Correlation of coating thickness and area related mass
7 Heat treatment
Annex A (normative) Determination of phosphate conversion coating resistance to neutral salt spray test
Annex B (informative) General information
Annex C (informative) Identification of phosphate conversion coating
Bibliography
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International

Standard

ISO 9717
Metallic and other inorganic 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)
Fourth edition
2024-07
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ContentsPage

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;
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.

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.
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International StandardISO 9717:2024(en)
Metallic and other inorganic coatings — Phosphate conversion coating of metals
WARNINGThis 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.

1Scope

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).

2Normative 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

3Terms 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/
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Bibliography
[1]
ISO 2177, Metallic coatings — Measurement of coating thickness — Coulometric method by anodic dissolution
[2]
ISO 2178, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness — Magnetic method
[3]
ISO 3497, Metallic coatings — Measurement of coating thickness — X-ray spectrometric methods
[4]
ISO 4536, Metallic and non-organic coatings on metallic substrates — Saline droplets corrosion test (SD test)
[5]
ISO 4628-3, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 3: Assessment of degree of rusting
[6]
ISO 10289, Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates — Rating of test specimens and manufactured articles subjected to corrosion tests
[7]
ISO 10587, Metallic and other inorganic coatings — Test for residual embrittlement in both metallic-coated and uncoated externally-threaded articles and rods — Inclined wedge method
[8]
ISO 9223, Corrosion of metals and alloys — Corrosivity of atmospheres — Classification, determination and estimation
[9]
ISO 27830, Metallic and other inorganic coatings — Requirements for the designation of metallic and inorganic coatings
[10]
ISO/TR 16335, Corrosion of metals and alloys — Corrosion tests in artificial atmospheres — Guidelines for selection of accelerated corrosion test for product qualification
[11]
ASTM E527, Standard practice for numbering metals and alloys in the Unified Numbering System (UNS). Available from ASTM International, 100 Barr Harbor Drive, West Conshohocken, Pennsylvania, USA
[12]
ASTM B117, Standard practice for operating salt spray (fog) — Apparatus
[13]
SAE AMS-03-11A, Phosphate Treatment of Iron and Steel
[14]
RAY G.P. Thickness testing of electroplated and related coatings, 2nd edition, 1993, Electrochemical Publications Ltd
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ICS 25.220.20
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