ISO 28340:2013

INTERNATIONAL ISO
STANDARD 28340
First edition
2013-02-15
Combined coatings on aluminium —
General specifications for combined
coatings of electrophoretic organic
coatings and anodic oxidation
coatings on aluminium
Revêtements combinés sur aluminium — Spécifications générales
pour les revêtements combinés appliqués sur l’aluminium composés
d’un revêtement organique obtenu par électrophorèse appliqué sur
un revêtement obtenu par anodisation
Reference number
©
ISO 2013
© ISO 2013
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ii © ISO 2013 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classes . 2
5 Quality . 3
5.1 General . 3
5.2 Appearance . 3
5.3 Colour . 3
5.4 Gloss . 3
5.5 Thickness of anodic oxidation coating . 3
5.6 Corrosion resistance . 3
5.7 Resistance to accelerated weathering . . 4
5.8 Resistance to cyclic corrosion/UV light . 4
5.9 Outdoor exposure . 4
5.10 Hardness of the organic coating . 4
5.11 Adhesion of the organic coating . 4
5.12 Solvent resistance of the organic coating . 4
5.13 Chemical resistance . 4
5.14 Abrasion resistance . 5
6 Test specimen . 5
6.1 Sampling procedure . 5
6.2 Size of the test specimen . 5
6.3 Cleanliness of the test specimen . 5
7 Test . 5
7.1 General condition . 5
7.2 Test methods . 5
8 Expression of results .12
9 Test report .12
Annex A (informative) Recommended characteristics and performance .13
Annex B (normative) Rating number charts for evaluation of the corrosion rate .15
Annex C (normative) Rating number charts for evaluation of the alkali resistance test.16
Bibliography .17
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International
Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies
casting a vote.
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.
ISO 28340 was prepared by Technical Committee ISO/TC 79, Light metals and their alloys, Subcommittee
SC 2, Organic and anodic oxidation coatings on aluminium.
iv © ISO 2013 – All rights reserved

INTERNATIONAL STANDARD ISO 28340:2013(E)
Combined coatings on aluminium — General specifications
for combined coatings of electrophoretic organic coatings
and anodic oxidation coatings on aluminium
1 Scope
This International Standard gives specifications for the combined coatings of electrophoretic organic
coatings and anodic oxidation coatings on aluminium used for architecture.
It specifies the characteristic properties of combined coatings on aluminium, outlines the test methods
for checking these characteristic properties and specifies their required performance.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 1463, Metallic and oxide coatings — Measurement of coating thickness — Microscopical method
ISO 2360, Non-conductive coatings on non-magnetic electrically conductive basis materials — Measurement
of coating thickness — Amplitude-sensitive eddy-current method
ISO 2409, Paints and varnishes — Cross-cut test
ISO 2810, Paints and varnishes — Natural weathering of coatings — Exposure and assessment
ISO 2813, Paints and varnishes — Determination of specular gloss of non-metallic paint films at 20 degrees,
60 degrees and 85 degrees
ISO 2859-10, Sampling procedures for inspection by attributes — Part 10: Introduction to the ISO 2859
series of standards for sampling for inspection by attributes
ISO 4628-1, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity
and size of defects, and of intensity of uniform changes in appearance — Part 1: General introduction and
designation system
ISO 4892-4, Plastics — Methods of exposure to laboratory light sources — Part 4: Open-flame carbon-arc lamps
ISO 7599, Anodizing of aluminium and its alloys — General specifications for anodic oxidation coatings on
aluminium
ISO 7668, Anodizing of aluminium and its alloys — Measurement of specular reflectance and specular gloss
of anodic oxidation coatings at angles of 20 degrees, 45 degrees, 60 degrees or 85 degrees
ISO 8251, Anodizing of aluminium and its alloys — Measurement of abrasion resistance of anodic
oxidation coatings
ISO 8993, Anodizing of aluminium and its alloys — Rating system for the evaluation of pitting
corrosion — Chart method
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
ISO 11341, Paints and varnishes — Artificial weathering and exposure to artificial radiation — Exposure to
filtered xenon-arc radiation
ISO 11507, Paints and varnishes — Exposure of coatings to artificial weathering — Exposure to fluorescent
UV lamps and water
ISO 15184, Paints and varnishes — Determination of film hardness by pencil test
AAMA 612-02, Voluntary specification, performance requirements, and test procedures for combined
coatings of anodic oxide and transparent organic coatings on architectural aluminum
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
combined coatings
superimposed electrophoretic organic coating and anodic oxidation coating on aluminium
3.2
significant surface
part of the article covered or to be covered by the coatings, and for which the coatings are essential for
service and/or appearance
3.3
standard sample
limit sample
sample which defines the criteria for acceptable appearance
Note 1 to entry: This may be agreed between the surface processor and the customer.
4 Classes
The combined coatings are classified by corrosion resistance, which is specified in 5.6, resistance to
accelerated weathering specified in 5.7, and resistance to cyclic corrosion/UV light specified in 5.8.
Performance requirements are given in Table 1.
To test the corrosion resistance, the acetic acid salt spray (AASS) test (method A) or copper-accelerated
acetic acid salt spray (CASS) test (method B) shall be carried out.
To test the resistance to accelerated weathering, the xenon-arc lamp exposure test (method A) or the
open-flame carbon-arc lamp exposure test (method B) shall be carried out.
To test the resistance to cyclic corrosion/UV light, the AASS test (method A) shall be carried out or the
CASS test (method B) after the ultraviolet (UV) lamp exposure test specified in 5.8. The selection of the
test method should be agreed between the surface processor and the customer.
NOTE Classes and applied environments are given in Table A.1.
2 © ISO 2013 – All rights reserved

Table 1 — Classes of combined coatings on aluminium
Characteristic prop- Corrosion resist- Resistance to acceler- Resistance to cyclic corrosion/
erty ance ated weathering UV light
Test method A B A B A B
AASS CASS Xenon-arc Carbon-arc UV AASS UV CASS
lamp lamp
Testing Class 4 1 500 120 4 000 3 000 240 1 500 240 120
time
Class 3 1 500 120 2 000 1 500 240 1 500 240 120
h
Class 2 1 000 72 1 000 750 240 1 000 240 72
Class 1 — 24  350 250 —- —- —- —-
Criteria Corrosion: No remarkable colour Corrosion:
RN 9,5 or more change and chalking RN 9,0 or more
Gloss retention: 75 % or
more
5 Quality
5.1 General
The required quality for the applied products shall b
...