ISO 18768-2:2022
(Main)Organic coatings on aluminium and its alloys — Methods for specifying decorative and protective organic coatings on aluminium — Part 2: Liquid coatings
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
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
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ISO 18768-2:2022(E)
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© ISO 2022
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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
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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
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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
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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
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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).
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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.
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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.
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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
...
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