ISO 15730:2023

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

Le présent document 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 15510 pour plus d’informations sur la composition des alliages).

General Information

• Status: Published
• Publication Date: 15-May-2023
• 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: 6060 - International Standard published
• Start Date: 16-May-2023
• Due Date: 29-Feb-2024
• Completion Date: 16-May-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)

INTERNATIONAL ISO
STANDARD 15730
Second edition
2023-05
Metallic and other inorganic
coatings — Electropolishing as a
means of smoothing and passivating
stainless steel
Revêtements métalliques et autres revêtements inorganiques —
Polissage électrolytique comme procédé de lissage et de passivation
des aciers inoxydables
Reference number
ISO 15730:2023(E)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO 15730:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 15730:2023(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 .7
Bibliography . 8
iii
© ISO 2023 – All rights reserved

---------------------- Page: 3 ----------------------
ISO 15730:2023(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 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, 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.
iv
  © ISO 2023 – All rights reserved

---------------------- Page: 4 ----------------------
ISO 15730:2023(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.
v
© ISO 2023 – All rights reserved

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INTERNATIONAL STANDARD ISO 15730:2023(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 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).
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
...

NORME ISO
INTERNATIONALE 15730
Deuxième édition
2023-05
Revêtements métalliques et autres
revêtements inorganiques — Polissage
électrolytique comme procédé de
lissage et de passivation des aciers
inoxydables
Metallic and other inorganic coatings — Electropolishing as a means
of smoothing and passivating stainless steel
Numéro de référence
ISO 15730:2023(F)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO 15730:2023(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2023
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: [phone]
E-mail: [e-mail]
Web: www.iso.org
Publié en Suisse
ii
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ISO 15730:2023(F)
Sommaire Page
Avant-propos .iv
Introduction .v
1 Domaine d’application . 1
2 Références normatives .1
3 Termes et définitions . 1
4 Informations que le client doit fournir au finisseur . 2
5 Exigences . 3
5.1 Défauts visuels . 3
5.2 Procédé . 3
5.2.1 Généralités . 3
5.2.2 Polissage électrolytique . 3
5.2.3 Post-traitement et rinçage . 3
5.3 Essais de passivation . 4
5.4 Rapport d’essai . 4
6 Échantillonnage .4
7 Méthodes d’essai . 4
7.1 Essai d’immersion dans l’eau . 4
7.2 Essai en atmosphère humide . 5
7.3 Essai au brouillard salin neutre . 5
7.4 Essai au sulfate de cuivre . 5
7.4.1 Principe. 5
7.4.2 Réactifs . 5
7.4.3 Mode opératoire . . 5
7.5 Essai au ferroxyl modifié . 5
7.5.1 Principe. 5
7.5.2 Réactifs . 5
7.5.3 Mode opératoire . . 5
8 Rapport d’essai . 6
Annexe A (informative) Solution de polissage électrolytique et conditions opératoires
types . 7
Bibliographie . 8
iii
© ISO 2023 – Tous droits réservés

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ISO 15730:2023(F)
Avant-propos
L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes
nationaux de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est
en général confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude
a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,
gouvernementales et non gouvernementales, en liaison avec l’ISO participent également aux travaux.
L’ISO collabore étroitement avec la Commission électrotechnique internationale (IEC) en ce qui
concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d’approbation requis pour les différents types de documents ISO. Le présent document
a été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2
(voir www.iso.org/directives).
L’attention est appelée sur le fait que certains des éléments du présent document peuvent faire l’objet de
droits de propriété intellectuelle ou de droits analogues. L’ISO ne saurait être tenue pour responsable
de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant
les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de
l’élaboration du document sont indiqués dans l’Introduction et/ou dans la liste des déclarations de
brevets reçues par l’ISO (voir www.iso.org/brevets).
Les appellations commerciales éventuellement mentionnées dans le présent document sont données
pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un
engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l’ISO liés à l’évaluation de la conformité, ou pour toute information au sujet de l’adhésion
de l’ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles
techniques au commerce (OTC), voir le lien suivant: www.iso.org/iso/fr/avant-propos.html.
Le présent document a été élaboré par le comité technique ISO/TC 107, Revêtements métalliques et autres
revêtements inorganiques, sous-comité SC 8, Revêtements de conversion chimique, en collaboration avec
le comité technique CEN/TC 262, Revêtements métalliques et autres revêtements inorganiques, du Comité
européen de normalisation (CEN), conformément à l’Accord de coopération technique entre l’ISO et le
CEN (Accord de Vienne).
Cette deuxième édition annule et remplace la première édition (ISO 15730:2000), dont elle constitue
une révision mineure.
Les principales modifications sont les suivantes:
— les références normatives, et les termes et définitions ont été mis à jour;
— des erreurs rédactionnelles ont été corrigées.
Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent
document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes
se trouve à l’adresse www.iso.org/members.html.
iv
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ISO 15730:2023(F)
Introduction
Le polissage électrolytique permet de retirer une petite quantité déterminée de métal de la surface, ce
qui, outre de lui conférer un aspect lisse et brillant, donne à la surface une propreté lui permettant d’être
notamment utilisée par les fabricants d’équipements médicaux et de transformation des aliments.
Outre une meilleure passivation, le polissage électrolytique offre de nombreux autres avantages,
comme par exemple la relaxation des contraintes de surface, l’élimination du carbone et des oxydes de
surface et la réduction du frottement. La fragilisation par l’hydrogène des pièces n’a pas lieu au cours du
procédé de polissage électrolytique, qui s’effectue en quelques minutes.
La qualité de la passivation dépend du type d’acier inoxydable, de la formulation de la solution de
polissage électrolytique et des conditions opératoires. L’élimination du fer libre à la surface de
l’acier inoxydable entraîne une meilleure résistance à la corrosion. Aucun autre traitement chimique
n’est nécessaire pour passiver la surface de l’acier inoxydable. L’état de surface obtenu par polissage
électrolytique améliore également la passivation.
v
© ISO 2023 – Tous droits réservés

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NORME INTERNATIONALE ISO 15730:2023(F)
Revêtements métalliques et autres revêtements
inorganiques — Polissage électrolytique comme procédé
de lissage et de passivation des aciers inoxydables
AVERTISSEMENT — L’utilisation du présent document peut impliquer la mise en œuvre de
matériaux, d’opérations et de matériels dangereux. Le présent document ne prétend pas
couvrir tous les problèmes de sécurité liés à son utilisation. Il incombe à l’utilisateur du présent
document d’établir, avant de l’utiliser, des pratiques d’hygiène et de sécurité et de déterminer
l’applicabilité des restrictions réglementaires. D’importantes quantités d’hydrogène et
d’oxygène sont émises au niveau des électrodes lors du procédé de polissage électrolytique. Il
convient d’utiliser des modes opératoires d’aération appropriés afin d’assurer l’évacuation de
ces gaz. L’inflammation de l’hydrogène peut produire des explosions dangereuses.
1 Domaine d’application
Le présent document 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 15510 pour plus d’informations sur la composition
des alliages).
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie de leur
contenu, des exigences du présent document. Pour les références datées, seule l’édition citée s’applique.
Pour les références non datées, la dernière édition du document de référence s’applique (y compris les
éventuels amendements).
ISO 2064:1996, Revêtements métalliques et autres revêtements inorganiques — Définitions et principes
concernant le mesurage de l'épaisseur
ISO 2080:2022, Revêtements métalliques et autres revêtements inorganiques — Traitement de surface,
revêtements métalliques et autres revêtements inorganiques — Vocabulaire
ISO 4519:1980, Dépôts électrolytiques et finitions apparentées —
...

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
ii
  © 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.
iv
  © 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.
v
© 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
...

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

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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.
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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/
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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
...