ISO 15730

Metallic and other inorganic coatings — Electropolishing as a means of smoothing and passivating stainless steel

This document specifies the information to be supplied by the purchaser to the finisher, requirements and test methods for electropolishing as a means of smoothing and passivating stainless steel alloys in the S2XXXX, S3XXXX and S4XXXX series, and the precipitation hardened alloys (see ISO 15510 for information on composition).

Revêtements métalliques et autres revêtements inorganiques — Polissage électrolytique comme procédé de lissage et de passivation des aciers inoxydables

La présente Norme internationale détermine les informations que le client doit fournir au finisseur ainsi que les exigences et méthodes d'essai relatives au polissage électrolytique comme procédé de lissage et de passivation des aciers inoxydables des séries S2XXXX, S3XXXX et S4XXXX, ainsi que des aciers inoxydables à durcissement structural (voir l'ISO/TR 15510 pour plus d'informations sur la composition des alliages).

General Information

• Status: Not Published
• ICS: 25.220.20 - Surface treatment
• Technical Committee: ISO/TC 107/SC 8 - Chemical conversion coatings
• Drafting Committee: ISO/TC 107/SC 8 - Chemical conversion coatings
• Current Stage: 6000 - International Standard under publication
• Completion Date: 01-Mar-2023

Relations

• Revises: ISO 15730:2000 - Metallic and other inorganic coatings — Electropolishing as a means of smoothing and passivating stainless steel
• Effective Date: 03-Sep-2022

Standards Content (Sample)

ISO/FDIS 15730:2022(E)
ISO TC 107/SC 8
Date: 2022-10-03

Metallic and other inorganic coatings — Electropolishing as a means of smoothing and

passivating stainless steel
FDIS stage
Warning for WDs and CDs

This document is not an ISO International Standard. It is distributed for review and comment. It is subject to

change without notice and may not be referred to as an International Standard.

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 supporting documentation.
© ISO 2022 – All rights reserved
---------------------- Page: 1 ----------------------
© ISO 2022
Second edition
Date: 2022-11-21
---------------------- Page: 2 ----------------------
ISO/FDIS 15730:2022(E)
© ISO 2022

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’sISO'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: [e-mail] [e-mail]
Website: www.iso.orgwww.iso.org
Published in Switzerland.
iv © ISO 2022 – All rights reserved
---------------------- Page: 3 ----------------------
ISO/FDIS 15730:2022(E)
Contents

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

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

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

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

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

4 Information to be supplied by the purchaser to the finisher ................................................ 2

5 Requirements .......................................................................................................................................... 2

6 Sampling ................................................................................................................................................... 4

7 Test methods ........................................................................................................................................... 4

8 Test reports ............................................................................................................................................. 5

Annex A (informative) Typical electropolishing solution and operating conditions ................. 6

Bibliography .......................................................................................................................................................... 7

© ISO 2022 – All rights reserved v
---------------------- Page: 4 ----------------------
ISO/FDIS 15730:2022(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 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, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna

Agreement).

This second edition cancels and replaces the first edition (ISO 15730:2000), of which has undergoneit

constitutes a minor revision.
The main changes are as follows:

— updatethe normative references, and the terms and definitions have been updated;

— correct the editorial errors

A list of all parts in the ISO 15730 series can be found on the ISO website have been corrected.

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.
vi © ISO 2022 – All rights reserved
---------------------- Page: 5 ----------------------
ISO/FDIS 15730:2022(E)
Introduction

Electropolishing removes a small but finite amount of metal from the surface that, in addition to

smoothing and brightening, produces a hygienically clean surface desirable for use by manufacturers of

food processing and medical equipment.

In addition to improved passivation, electropolishing provides many other benefits. Some examples are

surface stress relief, removal of surface carbon and oxides and reduction of friction. Hydrogen

embrittlement of articles is not produced during the electropolishing process, which takes minutes to

perform.

The quality of passivation depends on the type of stainless steel, the formulation of the electropolishing

solution and the conditions of operation. Free iron on the surface of the stainless steel is removed

resulting in improved corrosion resistance. No further chemical treatment is necessary in order to

passivate the stainless steel surface. Surface smoothing obtained by electropolishing also improves

passivation.
© ISO 2022 – All rights reserved vii
---------------------- Page: 6 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 15730:2022(E)
Metallic and other inorganic coatings — Electropolishing as a
means of smoothing and passivating stainless steel

WARNING — The use of this document may involve hazardous materials, operations and equipment. This

document does not purport to address all the safety problems associated with its use. It is the

responsibility of the user of this document to establish appropriate safety and health practices, and to

determine the applicability of regulatory limitations prior to use. Large quantities of hydrogen and

oxygen gases are evolved at the electrodes during the electropolishing process. Proper ventilation

procedures should be used to ensure their removal. Ignition of hydrogen gas can result in dangerous

explosions.
1 Scope

This International Standarddocument specifies the information to be supplied by the purchaser to the

finisher, requirements and test methods for electropolishing as a means of smoothing and passivating

stainless steel alloys in the S2XXXX, S3XXXX and S4XXXX series, and the precipitation hardened alloys

(see ISO/TR 15510 for information on composition).
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 2064:1996, Metallic and other inorganic coatings — Definitions and conventions concerning the

measurement of thickness.

ISO 2080:2022, Electroplating and related processes Metallic and other inorganic coatings — Surface

treatment, metallic and other inorganic coatings — Vocabulary.

ISO 4519:1980, Electrodeposited metallic coatings and related finishes — Sampling procedures for

inspection by attributes.
ISO 9227:2017, Corrosion tests in artificial atmospheres — Salt spray tests.
ISO /15510:2014, Stainless steels — Chemical composition.

ISO 16348:2003, Metallic and other inorganic coatings — Definitions and conventions concerning

appearance.
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO2064, ISO2080ISO 2064,

ISO 2080 and ISO 4519 and the following 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/
© ISO 2022 – All rights reserved 1
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ISO/FDIS 15730:2022(E)
3.1
passivation
rendering of a stainless steel surface into a lower state of chemical reactivity

Note 1 to entry: Passivated surfaces are characterized by the absence of free iron and the formation of a thin

coherent oxide film.
3.2
electropolishing

improvement in surface smoothness and brightness of a metal surface by making it anodic in an

appropriate solution
[SOURCE: ISO 2080:2022, 3.2.114]
3.3
inspection lot

a collection of coated articles that are of the same kind, that have been produced to the same

specifications, that have been coated by a single supplier at one time, or at approximately the same time,

under essentially identical conditions and that are submitted for acceptance or rejection as a group

[SOURCE: ISO 4519:1980, 3.7]
3.4
significant surface

The part of the article covered or to be covered by the coating and for which the coating is essential for

serviceability and/or appearance and where the coating must meet all of the specified requirements

[SOURCE: ISO 2064:1996, 3.1]
4 Information
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 15730
ISO/TC 107/SC 8
Metallic and other inorganic
Secretariat: KATS
coatings — Electropolishing as a
Voting begins on:
2022-12-06 means of smoothing and passivating
stainless steel
Voting terminates on:
2023-02-28
Revêtements métalliques et autres revêtements inorganiques —
Polissage électrolytique: procédé de brillantage (ou nivellement) et de
passivation des aciers inoxydables
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 15730:2022(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 2022
---------------------- Page: 1 ----------------------
ISO/FDIS 15730:2022(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 15730
ISO/TC 107/SC 8
Metallic and other inorganic
Secretariat: KATS
coatings — Electropolishing as a
Voting begins on:
means of smoothing and passivating
stainless steel
Voting terminates on:
Revêtements métalliques et autres revêtements inorganiques —
Polissage électrolytique: procédé de brillantage (ou nivellement) et de
passivation des aciers inoxydables
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
ISO/CEN PARALLEL PROCESSING

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.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: [phone]
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: [e-mail]
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 15730:2022(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
© ISO 2022 – All rights reserved
NATIONAL REGULATIONS. © ISO 2022
---------------------- Page: 2 ----------------------
ISO/FDIS 15730:2022(E)
Contents Page

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

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

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

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

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

4 Information to be supplied by the purchaser to the finisher ............................................................................... 2

5 Requirements .......................................................................................................................................................................................................... 2

5.1 Visual defects ........................................................................................................................................................................................... 2

5.2 Process ........................................................................................................................................................................................................... 3

5.2.1 General ........................................................................................................................................................................................ 3

5.2.2 Electropolishing .................................................................................................................................................................. 3

5.2.3 Post treatment and rinsing ....................................................................................................................................... 3

5.3 Passivation testing .............................................................................................................................................................................. 3

5.4 Test report .................................................................................................................................................................................................. 4

6 Sampling ....................................................................................................................................................................................................................... 4

7 Test methods ............................................................................................................................................................................................................ 4

7.1 Water immersion test ....................................................................................................................................................................... 4

7.2 Humidity test ........................................................................................................................................................................................... 4

7.3 Neutral salt spray test ...................................................................................................................................................................... 4

7.4 Copper sulfate test .............................................................................................................................................................................. 4

7.4.1 Principle ..................................................................................................................................................................................... 4

7.4.2 Reagents ..................................................................................................................................................................................... 5

7.4.3 Procedure ................................................................................................................................................................................. 5

7.5 Modified “ferroxyl” test .................................................................................................................................................................. 5

7.5.1 Principle ..................................................................................................................................................................................... 5

7.5.2 Reagents ..................................................................................................................................................................................... 5

7.5.3 Procedure ................................................................................................................................................................................. 5

8 Test report .................................................................................................................................................................................................................. 5

Annex A (informative) Typical electropolishing solution and operating conditions ......................................6

Bibliography ................................................................................................................................................................................................................................ 7

iii
© ISO 2022 – All rights reserved
---------------------- Page: 3 ----------------------
ISO/FDIS 15730:2022(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 non­governmental, 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 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, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna

Agreement).

This second edition cancels and replaces the first edition (ISO 15730:2000), of which it constitutes a

minor revision.
The main changes are as follows:
— the normative references, and the terms and definitions have been updated;
— editorial errors have been corrected.

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.
© ISO 2022 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/FDIS 15730:2022(E)
Introduction

Electropolishing removes a small but finite amount of metal from the surface that, in addition to

smoothing and brightening, produces a hygienically clean surface desirable for use by manufacturers of

food processing and medical equipment.

In addition to improved passivation, electropolishing provides many other benefits. Some examples

are surface stress relief, removal of surface carbon and oxides and reduction of friction. Hydrogen

embrittlement of articles is not produced during the electropolishing process, which takes minutes to

perform.

The quality of passivation depends on the type of stainless steel, the formulation of the electropolishing

solution and the conditions of operation. Free iron on the surface of the stainless steel is removed

resulting in improved corrosion resistance. No further chemical treatment is necessary in order to

passivate the stainless steel surface. Surface smoothing obtained by electropolishing also improves

passivation.
© ISO 2022 – All rights reserved
---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 15730:2022(E)
Metallic and other inorganic coatings — Electropolishing
as a means of smoothing and passivating stainless steel

WARNING — The use of this document may involve hazardous materials, operations and

equipment. This document does not purport to address all the safety problems associated

with its use. It is the responsibility of the user of this document to establish appropriate safety

and health practices, and to determine the applicability of regulatory limitations prior to

use. Large quantities of hydrogen and oxygen gases are evolved at the e
...