Anodizing of aluminium and its alloys -- Test method for chemical resistance of anodic oxidation coatings on aluminium and its alloys using electromotive force apparatus

This document specifies a test method using electromotive force test apparatus for assessing the chemical resistance of anodic oxidation coatings on aluminium and its alloys.

Anodisation de l'aluminium et de ses alliages -- Méthode d'essai pour la résistance chimique des couches d'oxydation anodique sur l'aluminium et ses alliages à l'aide d'un appareil à force électromotrice

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Status
Published
Publication Date
09-Sep-2020
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
15-Aug-2020
Completion Date
14-Aug-2020
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ISO 23052:2020 - Anodizing of aluminium and its alloys -- Test method for chemical resistance of anodic oxidation coatings on aluminium and its alloys using electromotive force apparatus
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INTERNATIONAL ISO
STANDARD 23052
First edition
2020-09
Anodizing of aluminium and its
alloys — Test method for chemical
resistance of anodic oxidation
coatings on aluminium and its alloys
using electromotive force apparatus
Anodisation de l'aluminium et de ses alliages — Méthode d'essai
pour la résistance chimique des couches d'oxydation anodique
sur l'aluminium et ses alliages à l'aide d'un appareil à force
électromotrice
Reference number
ISO 23052:2020(E)
ISO 2020
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ISO 23052:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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Published in Switzerland
ii © ISO 2020 – All rights reserved
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ISO 23052:2020(E)
Contents Page

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

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

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

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

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

4 Principle ........................................................................................................................................................................................................................ 1

5 Reagents ........................................................................................................................................................................................................................ 1

6 Apparatus ..................................................................................................................................................................................................................... 2

7 Test specimen .......................................................................................................................................................................................................... 3

7.1 Sampling ....................................................................................................................................................................................................... 3

7.2 Size .................................................................................................................................................................................................................... 3

7.3 Treatment before testing ................................................................................................................................................................ 3

8 Procedure..................................................................................................................................................................................................................... 4

8.1 Test solution .............................................................................................................................................................................................. 4

8.2 Test temperature ................................................................................................................................................................................... 4

8.3 Measurement ............................................................................................................................................................................................ 4

9 Expression of results ........................................................................................................................................................................................ 4

10 Test report ................................................................................................................................................................................................................... 5

Annex A (informative) Other conditions for the chemical resistance test .................................................................... 6

Annex B (informative) Validation of the heating-up time............................................................................................................... 7

Annex C (informative) Test solution and dissolution time ............................................................................................................ 9

© ISO 2020 – All rights reserved iii
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ISO 23052:2020(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 79, Light metals and their alloys,

Subcommittee SC 2, Organic and anodic oxidation coatings on aluminium.

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 2020 – All rights reserved
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ISO 23052:2020(E)
Introduction

Anodic oxidation coatings can be exposed to various chemicals and attacked by chemical means. The

resistance of anodic oxidation coatings to chemicals can give important information about how the

characteristics of the coatings are affected by anodizing conditions, especially sealing conditions.

The test given in this document evaluates resistance to alkali or acid by measuring the dissolving time

of anodic oxidation coatings. This method can test the chemical resistance characteristics of the whole

thickness of the coatings.

This test method for chemical resistance using electromotive force apparatus has positive

characteristics, such as a simplified testing apparatus, the reduction of artificial errors and applicability

to thick anodic oxidation coatings over 20 μm. This test method is characterized by its small test area,

the small quantity of test liquid used and a short testing time. In addition, both the test solutions can be

supported by the same apparatus.

This method specified in this document uses sodium hydroxide or phosphoric acid, but it is possible

to use other chemicals in accordance with the use environment. Therefore, this method can be widely

applicable to anodic oxidation coatings for industrial products, electrical appliances or kitchenware.

© ISO 2020 – All rights reserved v
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INTERNATIONAL STANDARD ISO 23052:2020(E)
Anodizing of aluminium and its alloys — Test method
for chemical resistance of anodic oxidation coatings
on aluminium and its alloys using electromotive force
apparatus
1 Scope

This document specifies a test method using electromotive force test apparatus for assessing the

chemical resistance of anodic oxidation coatings on aluminium and its alloys.
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 7583, Anodizing of aluminium and its alloys — Terms and definitions
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 7583 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
chemical resistance
capability of a coating to resist chemical agents of alkali and acid
4 Principle

This test is a method assessing chemical resistance by measuring the dissolving time of an anodic

oxidation coating by a test solution. The dissolving time is determined by measuring the time from the

injection of a test solution into an electric potential cell to detection of an electromotive force, which

occurs when the coating is dissolved and there is electrical continuity between the test specimen and the

cell. This test is capable of assessing the total characteristics of anodic oxidation coatings on aluminium

and its alloys. Therefore, among products of the same coating thickness, this test can be applied to

assess the protective capacity of the whole coating against chemical attack and its relationship with

certain sealing methods, see Annex C.
5 Reagents

Use only reagents of a recognized analytical grade and distilled water or deionized water of preferably

less than 2 μS/cm in conductivity, unless otherwise agreed by the anodizer and the customer.

The test solution should be prepared each time prior to use.
NOTE Where solut
...

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