Organic coatings on aluminium and its alloys — Methods for specifying decorative and protective organic coatings on aluminium — Part 2: Liquid coatings

This document specifies methods for specifying decorative and protective organic coatings on aluminium and its alloys. It defines the characteristic properties of organic liquid coatings and provides testing methods with minimum performance requirements, with reference to the application and the aggressiveness of the environment in which the painted aluminium exists. This document is applicable to aluminium products with liquid coatings for general applications, and liquid coatings mainly processed by electrostatic liquid spraying, air spraying or airless spraying. This document does not apply to coil coatings on aluminium.

Couches organiques sur l’aluminium et ses alliages — Méthodes de spécification des revêtements décoratifs et protecteurs sur aluminium — Partie 2: Revêtements liquides

General Information

Status
Published
Publication Date
31-May-2022
Current Stage
6060 - International Standard published
Start Date
01-Jun-2022
Due Date
07-May-2022
Completion Date
01-Jun-2022
Ref Project

Buy Standard

Standard
ISO 18768-2:2022 - Organic coatings on aluminium and its alloys — Methods for specifying decorative and protective organic coatings on aluminium — Part 2: Liquid coatings Released:6/1/2022
English language
40 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 18768-2
First edition
2022-06
Organic coatings on aluminium and
its alloys — Methods for specifying
decorative and protective organic
coatings on aluminium —
Part 2:
Liquid coatings
Couches organiques sur l’aluminium et ses alliages — Méthodes
de spécification des revêtements décoratifs et protecteurs sur
aluminium —
Partie 2: Revêtements liquides
Reference number
ISO 18768-2:2022(E)
© ISO 2022

---------------------- Page: 1 ----------------------
ISO 18768-2:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© 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’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: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2022 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 18768-2:2022(E)
Contents Page
Foreword . vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Information to be supplied by the customer to the surface processor .3
5 Metal preparation and pretreatment . 5
5.1 Material (substrate) . 5
5.2 Pretreatment of the substrate . 5
5.2.1 General . 5
5.2.2 Degreasing etching and rinsing . 5
5.2.3 Anodic oxidation coating . 5
5.2.4 Chemical conversion coatings . 5
5.2.5 Alternative pretreatment . 6
6 Categories . 6
7 Tests . 8
7.1 General . 8
7.2 Appearance . 8
7.2.1 General . 8
7.2.2 Measurement . 8
7.2.3 Requirement . 8
7.3 Colour . 9
7.3.1 General . 9
7.3.2 Visual method . 9
7.3.3 Instrumental method . 9
7.4 Gloss . 9
7.4.1 Measurement . 9
7.4.2 Requirement . 10
7.5 Brightness (distinctness of image) . 10
7.5.1 General . 10
7.5.2 Measurement . 10
7.5.3 Requirement . 10
7.6 Thickness . 10
7.6.1 General . 10
7.6.2 Measurement . 11
7.6.3 Requirement . 11
7.7 Hardness (pencil) . . 11
7.7.1 Measurement . 11
7.7.2 Requirement . 11
7.8 Adhesion . 11
7.8.1 General . 11
7.8.2 Scratch circular roll method .12
7.8.3 Dry adhesion test .12
7.8.4 Wet adhesion test.13
7.8.5 Pull-off test .13
7.9 Impact resistance . 13
7.9.1 General .13
7.9.2 Measurement . 14
7.9.3 Requirement . 14
7.10 Multi-impact stone chipping resistance . 14
7.10.1 General . 14
7.10.2 Measurement . 14
iii
© ISO 2022 – All rights reserved

---------------------- Page: 3 ----------------------
ISO 18768-2:2022(E)
7.10.3 Requirement . 14
7.11 Abrasion resistance . . . 14
7.11.1 General . 14
7.11.2 Falling sand test . 14
7.11.3 Rotating, abrasive rubber-wheel test . 15
7.11.4 Friction coefficient . 15
7.12 Cupping test.15
7.12.1 Measurement .15
7.12.2 Requirement .15
7.13 Flexibility. 16
7.13.1 General . 16
7.13.2 T-bend test . 16
7.13.3 Cylindrical mandrel bend test . 17
7.14 Processing resistance . 17
7.14.1 Measurement . 17
7.14.2 Requirement . 17
7.15 Permeating depths of ink . 17
7.15.1 Measurement . 17
7.15.2 Requirement . 17
7.16 Chemical resistance . 18
7.16.1 General . 18
7.16.2 Acid resistance . 18
7.16.3 Alkali resistance . 19
7.16.4 Detergent resistance . 20
7.16.5 Mortar resistance .20
7.16.6 Contamination resistance . 21
7.16.7 Oil resistance .22
7.17 Solvent resistance .22
7.17.1 General .22
7.17.2 Measurement .22
7.17.3 Requirement .22
7.18 Corrosion resistance .22
7.18.1 General .22
7.18.2 Neutral salt spray (NSS) test . 23
7.18.3 Acetic acid salt spray (AASS) test . 23
7.18.4 Copper-accelerated acetic acid salt spray (CASS) test . 24
7.18.5 Cyclic corrosion test . 24
7.18.6 Filiform corrosion resistance test . 25
7.18.7 Resistance to humid atmosphere containing sulfur dioxide .25
7.19 Humidity resistance . 25
7.19.1 Condensation resistance . 25
7.19.2 High temperature and high RH test . 26
7.19.3 Wet heat resistance test . .26
7.19.4 Thermocycling resistance test . 26
7.20 Water resistance . 27
7.20.1 Water immersion method . 27
7.20.2 Autoclave test . 27
7.20.3 Boiling water resistance . 27
7.21 Temperature resistance .28
7.21.1 Dry heat resistance test .28
7.21.2 Roasting resistance test .28
7.21.3 Low-temperature resistance test .28
7.22 Surface tension .29
7.22.1 General .29
7.22.2 Measurement .29
7.22.3 Requirement .29
7.23 Hydrophilicity .29
7.23.1 General .29
iv
  © ISO 2022 – All rights reserved

---------------------- Page: 4 ----------------------
ISO 18768-2:2022(E)
7.23.2 Measurement .29
7.23.3 Requirement .30
7.24 Thermal viscosity .30
7.24.1 General .30
7.24.2 Measurement .30
7.24.3 Requirement . 31
7.25 Resistivity . 31
7.25.1 General . 31
7.25.2 Measurement . 31
7.25.3 Requirement . 31
7.26 Weathering resistance . 31
7.26.1 General . 31
7.26.2 Outdoor exposure . . 31
7.26.3 Accelerated weathering resistance . 32
7.27 Sealing compounds adhesion . 32
7.27.1 Measurement . 32
7.27.2 Requirement . 33
Annex A (informative) Summary of information to be supplied by the customer to the
surface processor .34
Annex B (informative) Coating materials .37
Annex C (informative) Categories for architectural application .38
Bibliography .39
v
© ISO 2022 – All rights reserved

---------------------- Page: 5 ----------------------
ISO 18768-2:2022(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 79, Light metals and their alloys,
Subcommittee SC 2, Organic and anodic oxidation coatings on aluminium.
A list of all parts in the ISO 18768 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.
vi
  © ISO 2022 – All rights reserved

---------------------- Page: 6 ----------------------
ISO 18768-2:2022(E)
Introduction
There are three major surface treatments on aluminium and its alloys:
a) anodic oxidation coatings;
b) organic coatings;
c) combined coatings of anodic oxidation coatings and organic coatings.
ISO 18768-1 and this document provide the performance requirements and test methods for b) organic
coatings.
Performance requirements and test methods for a) anodic oxidation coatings are given in ISO 7599 and
for c) combined coatings of anodic oxidation coatings and organic coatings in ISO 28340.
It is assumed that users are familiar with other relevant international and regional standards. Those
standards should be respected, and this document adopts optional systems in such cases.
vii
© ISO 2022 – All rights reserved

---------------------- Page: 7 ----------------------
INTERNATIONAL STANDARD ISO 18768-2:2022(E)
Organic coatings on aluminium and its alloys — Methods
for specifying decorative and protective organic coatings
on aluminium —
Part 2:
L
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.