introduction
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ISO 18768-2-2022 – Organic Coatings on aluminium and its alloys – Specification of methods for decorative and protective organic coatings on aluminium – Part 2: Liquid coatings
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This document was prepared by Technical Committee ISO/TC 79, Light Metals and their Alloys, Subcommittee SC 2, Organic and anodized Coatings on Aluminium.
A list of all parts in the ISO 18768 series can be found on the ISO website.
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introduce
There are three main surface treatments for aluminum and its alloys:
a) anodized coating;
b) Organic coatings;
c) A combination of anodized coating and organic coating.
ISO 18768-1 and this document provide b) performance requirements and test methods for organic coatings.
a) Performance requirements and test methods for anodized coatings are given in ISO 7599, and c) combined anodized coatings and organic coatings are given in ISO 28340.
It is assumed that users are familiar with other relevant international and regional standards. These standards should be respected, and this document uses an optional system in this context.
ISO 18768-2-2022 – Organic Coatings on aluminium and its alloys – Specification of methods for decorative and protective organic coatings on aluminium – Part 2: Liquid coatings
1 Range
This document specifies methods for specifying decorative and protective organic coatings on aluminum and its alloys. It defines the characteristic properties of organic liquid coatings and provides a test method with minimum performance requirements, with reference to the application and erosion of the environment in which the painted aluminum is applied.
This document applies to aluminum products with liquid coatings for general use, as well as liquid coatings processed primarily by electrostatic liquid spraying, air spraying or airless spraying.
This document does not apply to aluminum coil coatings.
2 Normative references
The following files are referenced in text in a manner that constitutes part or all of the requirements of this document. For dated references, only the cited version applies. For undated references, a new version of the reference (including any revisions) applies.
ISO 1463, Metal and oxide coatings – Measurement of coating thickness – microscopy methods
ISO 1519, Paints and varnishes – Bending test (cylindrical mandrel)
ISO 1520, Paints and varnishes – cupping test
ISO 2106, Anodizing of aluminium and its alloys – Determination of mass per unit area (surface density) of anodized coatings – Gravimetric method
ISO 18768-2-2022 – Organic Coatings on aluminium and its alloys – Specification of methods for decorative and protective organic coatings on aluminium – Part 2: Liquid coatings
ISO 2360, Non-conductive coatings on non-magnetic conductive base metals – Measurement of coating thickness – amplitude sensitive eddy current method
ISO 2409, Paints and varnishes – Crosscutting testing
ISO 2812-2 Paints and varnishes – Determination of resistance to liquids – Part 2: Water immersion method
ISO 2813, Paints and varnishes – Determination of gloss values at 20°, 60° and 85°
ISO 3892, Conversion coatings on metallic materials – Determination of coating mass per unit area – Gravimetric method
ISO 4211-2, Furniture – Surface finish testing – Part 2: Assessment of resistance to moisture and heat
ISO 4211-3, Furniture – Surface finish testing – Part 3: Assessment of resistance to dry heat
ISO 4623-2, Paints and varnishes – Determination of filamentous corrosion – Part 2: Aluminium substrates
ISO 4624, Paints and varnishes – adhesion pull-out test
ISO 4628-2, Paints and varnishes – Assessment of coating degradation – designation of number and size of defects, and intensity of uniform changes in appearance – Part 2: Assessment of degree of foaming
ISO 18768-2-2022 – Organic Coatings on aluminium and its alloys – Specification of methods for decorative and protective organic coatings on aluminium – Part 2: Liquid coatings
ISO 4628-10, Paints and varnishes – Assessment of coating degradation – designation of number and size of defects, and intensity of uniform changes in appearance – Part 10: Assessment of degree of filamentous corrosion
ISO 6270-1, Paints and varnishes – Determination of moisture resistance – Part 1: Condensation (single side exposure)
ISO 6270-2, Paints and varnishes – Determination of moisture resistance – Part 2: Condensation (exposure in cabinets with hot water tanks)
ISO 6270-3, Paints and varnishes – Determination of moisture resistance – Part 3: Condensation (exposure in cabinets with heated, bubbling tanks)
ISO 6272-2, Paints and varnishes – Rapid deformation (impact resistance) tests – Part 2: drop weight test, small area indenter
ISO 7784-1 Paints and varnishes – Determination of wear resistance – Part 1: Method of covering wheels and rotating specimens with sandpaper
ISO 7784-2, Paints and varnishes – Determination of wear resistance – Part 2: Method of using abrasive rubber wheels and rotating specimens
ISO 8295, plastics – Films and sheets – Determination of coefficient of friction
ISO 8296, plastics – Films and sheets – Determination of wetting tension
ISO 18768-2-2022 – Organic Coatings on aluminium and its alloys – Specification of methods for decorative and protective organic coatings on aluminium – Part 2: Liquid coatings
ISO 9227, corrosion testing in artificial atmospheres – salt spray testing
ISO 15184, paints and varnishes – Determination of film hardness by pencil test
ISO 17132-2007, paints and varnishes. T-bend test
ISO 16474-2, Paints and varnishes – Methods of exposure to laboratory light sources – Part 2: xenon arc lamps
ISO 21227-2, Paints and varnishes – Evaluation of defects on coated surfaces using optical imaging – Part 2: Evaluation procedure for multiple impact lithotriptic testing
ISO 28340:2013, Composite coatings on aluminium – General specification for combined coatings of electrophoretic organic coatings and anodized coatings on aluminium
ASTM C207, Standard specification for hydrated lime for Masonry
ASTM D968, Standard Test method for Wear Resistance of Organic Coatings through Dropped abrasives
ASTM D7869, Standard Practice for Xenon Arc Exposure Testing of Transportation Coatings, Enhanced Light and water exposure
QUALICOAT Specification 2022, Quality labeling specification for liquid and powder organic coatings on aluminum for construction applications
GSB QR AL 631-7 ST 663-7, Methods of Measurement and testing
ISO 18768-2-2022 – Organic Coatings on aluminium and its alloys – Specification of methods for decorative and protective organic coatings on aluminium – Part 2: Liquid coatings
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Liquid Coating
A dry coating of a certain thickness that has decorative and protective effects on the product, the coating is formed by liquid paint and does not include coatings formed by anodizing, combination coating or powder coating
3.2 Reference Examples
Reference specimen
Define a sample of acceptable attribute criteria
Note 1: This can be agreed between the customer and the surface treatment provider
3.3 Important Surfaces
The part of the article covered or to be covered by the coating, and the coating is of no further importance to the service and/or appearance
3.4 Sample
A single sample of the final product for testing
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