Paints and varnishes -- Electro-deposition coatings

1 Scope This document specifies a method for determining the wet-film resistivity of an electro-deposition coating (e‑coat) for automotive industries and other general industrial applications, e.g. chiller units, consumer products, radiators, aerospace, agriculture.

Peintures et vernis -- Peintures d'électrodéposition

General Information

Status
Published
Publication Date
04-May-2020
Current Stage
6060 - International Standard published
Start Date
05-May-2020
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ISO 22553-7:2020 - Paints and varnishes -- Electro-deposition coatings
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INTERNATIONAL ISO
STANDARD 22553-7
First edition
2020-05
Paints and varnishes — Electro-
deposition coatings —
Part 7:
Electrical wet-film resistance
Peintures et vernis — Peintures d'électrodéposition —
Partie 7: Résistance électrique du film frais
Reference number
ISO 22553-7:2020(E)
ISO 2020
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ISO 22553-7:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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.
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Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2020 – All rights reserved
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ISO 22553-7:2020(E)
Contents Page

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

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

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

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

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

4 Principle ........................................................................................................................................................................................................................ 3

5 Apparatus and materials.............................................................................................................................................................................. 3

6 Test panels .................................................................................................................................................................................................................. 4

7 Number of determinations ........................................................................................................................................................................ 4

8 Sample preparation ........................................................................................................................................................................................... 5

9 Procedure..................................................................................................................................................................................................................... 5

10 Evaluation .................................................................................................................................................................................................................... 6

10.1 Dynamic electrical wet-film resistance .............................................................................................................................. 6

10.2 Static electrical wet-film resistance ...................................................................................................................................... 6

10.3 Electrical wet-film resistivity ..................................................................................................................................................... 6

11 Precision ....................................................................................................................................................................................................................... 7

12 Test report ................................................................................................................................................................................................................... 7

Annex A (informative) Theoretical derivation of the wet-film resistivity .....................................................................8

Annex B (informative) Sample calculation of the electrical wet-film resistivity .................................................10

Bibliography .............................................................................................................................................................................................................................11

© ISO 2020 – All rights reserved iii
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ISO 22553-7:2020(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 35, Paints and varnishes, Subcommittee

SC 9, General test methods for paints and varnishes.
A list of all parts in the ISO 22553 series can be found on the ISO website.

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 22553-7:2020(E)
Introduction

The electrical wet-film resistivity provides information about the deposition behaviour of electro-

deposition coatings, i.e. about film thickness and changes in film thickness, throwing power and

possibly also the deposition performance under defined conditions.
© ISO 2020 – All rights reserved v
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INTERNATIONAL STANDARD ISO 22553-7:2020(E)
Paints and varnishes — Electro-deposition coatings —
Part 7:
Electrical wet-film resistance
1 Scope

This document specifies a method for determining the wet-film resistivity of an electro-deposition

coating (e-coat) for automotive industries and other general industrial applications, e.g. chiller units,

consumer products, radiators, aerospace, agriculture.
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 1514, Paints and varnishes — Standard panels for testing
ISO 4618, Paints and varnishes — Terms and definitions

ISO 22553-1, Paints and varnishes — Electro-deposition coatings — Part 1: Vocabulary

ISO 23321, Solvents for paints and varnishes — Demineralized water for industrial applications —

Specification and test methods
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4618, ISO 22553-1 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
electrical resistance

ratio of the potential difference along a conductor and the current through the conductor

Note 1 to entry: Resistance is given by Ohm’s law shown in Formula (1):
R= (1)
where
U is the potential difference;
I is the current.
© ISO 2020 – All rights reserved 1
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ISO 22553-7:2020(E)
The unit of electrical resistance is the ohm (Ω), given by:
1volt
1ohm=
1ampere

The electrical resistance depends on the material of the conductor, its dimensions (length and cross-

section) and its temperature.
[SOURCE: ISO 15091:2019, 3.1]
3.2
resistivity
resistance per unit length of a material of cross-sectional area
Note 1 to entry: Resistivity is given by Formula (2):
ρ=⋅R (2)
where
A is the cross-sectional area of the conductor;
l is the length of the conductor.
The unit of electrical resistivity is the ohm ⋅ metre (Ω⋅m).
[SOURCE: ISO 15091:2019, 3.2]
3.3
electrical wet-film resistance

measured total electrical resistance (3.1) of the electro-deposition coating including substrate, pre-

treatment and other coats

Note 1 to entry: When the electrical resistance is being measured, the technical measurement conditions also

have an influence, e.g. membrane, measurement electrode.
Note 2 to entry: The unit of electrical wet-film resistance is the ohm (Ω).
3.4
dynamic electrical wet-film resistance
R (t)
w, dyn

measured total electrical resistance (3.1) of the electro-deposition coating including substrate, pre-

treatment and other coats as a function of the deposition time

Note 1 to entry: The unit of electrical wet-film resistance (3.3) is the ohm (Ω).

3.5
static electrical wet-film resistance
R (t )
w, sta end

measured total electrical resistance (3.1) of the electro-deposition coating including substrate, pre-

treatment and other coats as read off at the end of the deposition time

Note 1 to entry: The unit of electrical wet-film resistance (3.3) is the ohm (Ω).

2 © ISO 2020 – All rights reserved
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ISO 22553-7:2020(E)
3.6
electrical wet-film resistivity

electrical wet-film resistance (3.3) multiplied by the area of the electrodes related to the distance

between the electrodes
Note 1 to entry: Electrical wet-film resistivity is given by Formula (3):
ρ =⋅R (3)
where
R is the electrical wet-film resistance;
A is the area of the electrodes;
l is the length of the conductor.
The unit of electrical wet-film resistivity is the ohm ⋅ metre (Ω⋅m).
3.7
electrical conductivity
reciprocal of the resistivity (3.2)
Note 1 to entry: E
...

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