Paints and varnishes -- Electro-deposition coatings

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

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Published
Publication Date
07-Jun-2020
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6060 - International Standard published
Start Date
08-Jun-2020
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INTERNATIONAL ISO
STANDARD 22553-8
First edition
2020-06
Paints and varnishes — Electro-
deposition coatings —
Part 8:
Electric charge density
Reference number
ISO 22553-8:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 22553-8:2020(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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 22553-8:2020(E)
Contents Page

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

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

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

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

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

4 Principle ........................................................................................................................................................................................................................ 2

5 Apparatus and materials.............................................................................................................................................................................. 2

6 Test panels .................................................................................................................................................................................................................. 3

7 Number of determinations ........................................................................................................................................................................ 3

8 Sample preparation ........................................................................................................................................................................................... 3

9 Procedure..................................................................................................................................................................................................................... 4

10 Evaluation .................................................................................................................................................................................................................... 5

10.1 Electric charge density per unit mass ................................................................................................................................. 5

10.2 Electric charge density per unit volume ........................................................................................................................... 5

11 Precision ....................................................................................................................................................................................................................... 6

12 Test report ................................................................................................................................................................................................................... 6

Annex A (informative) Calculation of the electric charge density per unit mass using the

practical or theoretical dry-film thickness in accordance with ISO 3233-2 or ISO 3233-3 ....8

Bibliography .............................................................................................................................................................................................................................10

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 22553-8:2020(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
---------------------- Page: 4 ----------------------
ISO 22553-8:2020(E)
Introduction

The electric charge density provides information about the efficiency of the deposition process during

electro-deposition coating.

If measurement of the electrical wet-film resistance in accordance with ISO 22553-7 is necessary, this

can be specified in the test assembly provided.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 22553-8:2020(E)
Paints and varnishes — Electro-deposition coatings —
Part 8:
Electric charge density
1 Scope

This document specifies a method for determining the electric charge density 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 2808, Paints and varnishes — Determination of film thickness
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
electric charge density
volume electric charge
quotient of electrical charge Q and volume V:
ρ =

Note 1 to entry: The electric charge density is expressed in coulombs per cubic metre (C⋅m ).

−3 −3
Note 2 to entry: 1 C⋅m = 1 A⋅s⋅m .
© ISO 2020 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 22553-8:2020(E)
3.2
practical dry-film density
practically determined density of a dried and cured coating

[SOURCE: ISO 3233-3:2015, 3.4, modified: a hyphen was added to the term, between "dry" and "film".]

3.3
theoretical dry-film density

coating density calculated from the densities of the solvents, coating materials and the non-volatile-

matter content of the coating material

[SOURCE: ISO 3233-3:2015, 3.6, modified: a hyphen was added to the term, between "dry" and "film".]

4 Principle

A defined area of a test panel is coated and the coating is stoved. The film thickness is measured. The

determination is carried out between the minimum and critical current densities.
5 Apparatus and materials
Typical laboratory apparatus, together with the following:
5.1 Laboratory deposition system.

A laboratory deposition system consists of a deposition tank with tank recirculation and DC voltage

equipment — see Figure 1.
Key
1 anode 5 anode (counter electrode for cathodic e-coat)
2 cathode 6 cathode (test panel for cathodic e-coat)
3 electro-deposition coating material 7 acid
4 deposition tank 8 electro-deposition coating material

Figure 1 — Schematic diagram of a laboratory deposition system with cathodic e-coat material

as an example
The container of the deposition system shall be filled with the electro-deposi
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 22553-8
ISO/TC 35/SC 9
Paints and varnishes — Electro-
Secretariat: BSI
deposition coatings —
Voting begins on:
2020-03-11
Part 8:
Voting terminates on:
Electric charge density
2020-05-06
Peintures et vernis — Peintures d'électrodéposition —
Partie 8: Charge électrique volumique
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 22553-8:2020(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 2020
---------------------- Page: 1 ----------------------
ISO/FDIS 22553-8:2020(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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 22553-8:2020(E)
Contents Page

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

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

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

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

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

4 Principle ........................................................................................................................................................................................................................ 2

5 Apparatus and materials.............................................................................................................................................................................. 2

6 Test panels .................................................................................................................................................................................................................. 3

7 Number of determinations ........................................................................................................................................................................ 3

8 Sample preparation ........................................................................................................................................................................................... 3

9 Procedure..................................................................................................................................................................................................................... 4

10 Evaluation .................................................................................................................................................................................................................... 5

10.1 Electric charge density per unit mass ................................................................................................................................. 5

10.2 Electric charge density per unit volume ........................................................................................................................... 5

11 Precision ....................................................................................................................................................................................................................... 6

12 Test report ................................................................................................................................................................................................................... 6

Annex A (informative) Calculation of the electric charge density per unit mass using the

practical or theoretical dry-film thickness in accordance with ISO 3233-2 or ISO 3233-3 ....8

Bibliography .............................................................................................................................................................................................................................10

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 22553-8:2020(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, 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
---------------------- Page: 4 ----------------------
ISO/FDIS 22553-8:2020(E)
Introduction

The electric charge density provides information about the efficiency of the deposition process during

electro-deposition coating.

If measurement of the electrical wet-film resistance in accordance with ISO 22553-7 is necessary, this

can be specified in the test assembly provided.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 22553-8:2020(E)
Paints and varnishes — Electro-deposition coatings —
Part 8:
Electric charge density
1 Scope

This document specifies a method for determining the electric charge density 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 2808, Paints and varnishes — Determination of film thickness
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
electric charge density
volume electric charge
quotient of electrical charge Q and volume V:
ρ =

Note 1 to entry: The electric charge density is expressed in coulombs per cubic metre (C⋅m ).

−3 −3
Note 2 to entry: 1 C⋅m = 1 A⋅s⋅m .
© ISO 2020 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO/FDIS 22553-8:2020(E)
3.2
practical dry-film density
practically determined density of a dried and cured coating

[SOURCE: ISO 3233-3:2015, 3.4, modified: a hyphen was added to the term, between "dry" and "film".]

3.3
theoretical dry-film density

coating density calculated from the densities of the solvents, coating materials and the non-volatile-

matter content of the coating material

[SOURCE: ISO 3233-3:2015, 3.6, modified: a hyphen was added to the term, between "dry" and "film".]

4 Principle

A defined area of a test panel is coated and the coating is stoved. The film thickness is measured. The

determination is carried out between the minimum and critical current densities.
5 Apparatus and materials
Typical laboratory apparatus, together with the following:
5.1 Laboratory deposition system.

A laboratory deposition system consists of a deposition tank with tank recirculation and DC voltage

equipment — see Figure 1.
Key
1 anode 5 anode (counter electrode for cathodic e-coat)
2 cathode 6 c
...

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