Test methods for anodic oxidation coatings and organic polymer coatings on aluminium and aluminium alloys—Part 4: Determination of ultraviolet light and heat resistance
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
This is Part 4 of GB/T 12967 Test methods for anodic oxidation coatings and organic polymer coatings on aluminium and aluminium alloys: The following parts of GB/T 12967 have been issued:
——Part 1: Measurement of abrasion resistance;
——Part 3: Salt spray test;
——Part 4: Determination of ultraviolet light and heat resistance;
——Part 5: Assessment of resistance to cracking;
——Part 6: Determination of color and appearance.
This document replaces GB/T 12967.4-2014 Test methods for anodic oxidation coatings of aluminium and aluminium alloys - Part 4: Determination of the comparative fastness to ultraviolet light and heat of coloured anodic oxidation coatings. In addition to structural adjustment and editorial changes, the following main technical changes have been made with respect to GB/T 12967.4-2014:
——The applicable objects of the clause “Scope” are modified, and combined anodic oxide coatings and organic polymer coatings on aluminium and aluminium alloys are added (see Clause 1; Clause 1 of Edition 2014);
——The clause “Normative references” is added (see Clause 2);
——The clause “Terms and definitions” is added (see Clause 3);
——The principles for weather resistance test and heat resistance test are added in the clause “Summary of test methods” (see Clause 4; Clause 2 of Edition 2014);
——The contents about fluorescent ultraviolet and xenon lamp light sources are added in the clause “Apparatus” (see Clause 5 and Annex A; Clause 3 of Edition 2014);
——The clause “Samples” is added (see Clause 6);
——In the "Test procedures", the requirements for sample placement are modified (see 7.1; 4.1 of Edition 2014), and the parameters of natural exposure test, fluorescent ultraviolet weather resistance test, accelerated weather resistance test under xenon lamp and heat resistance test are added (see 7.5);
Test methods for anodic oxidation coatings and organic polymer coatings on aluminium and aluminium alloys - Part 4: Determination of ultraviolet light and heat resistance
1 Scope
This document gives a summary of the test methods for determining the ultraviolet light and heat resistance of anodic oxidation coatings and organic polymer coatings on aluminium and aluminium alloys, and specifies the apparatus, samples, test procedures, expression of results and test report.
This document is applicable to the determination of weather resistance and heat resistance of anodic oxidation coatings, combined anodic oxide coatings and organic polymer coatings on aluminium and aluminium alloys.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute indispensable provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 250 Textiles - Tests for colour fastness - Grey scale for assessing change in colour
GB/T 1766 Paints and varnishes - Rating schemes of degradation of coats
GB/T 4957 Non-conductive coatings on non-magnetic basis metals - Measurement of coating thickness - Eddy current
GB/T 6461 Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates - Rating of test specimens and manufactured articles subjected to corrosion tests
GB/T 8005.3 Aluminium of aluminium alloys -Terms and definitions - Part 3: Surface treatment terms
GB/T 9276 Methods of exposure to natural weathering of coating
GB/T 9754 Paints and varnishes - Determination of specular gloss of non-metallic paint films at 20°, 60°and 85°
GB/T 9761 Paints and varnishes - Visual comparison of the colour of paints
GB/T 11186.3 Methods for measuring the colour of paint films - Part 3: Calculation of colour differences
GB/T 12967.6 Test methods for anodic oxidation coatings and organic polymer coatings on aluminium and aluminium alloys - Part 6: Determination of color and appearance
GB/T 16422.1 Plastics - Methods of the exposure to laboratory light sources - Part 1: General guidance
GB/T 16422.2 Plastics - Methods of exposure to laboratory light sources - Part 2: Xenon-arc sources
GB/T 16422.3 Plastics - Methods of exposure to laboratory light sources - Part 3: Fluorescent UV lamps
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 80053 apply.
3.1
control sample
sample agreed by the Supplier and the Purchaser to limit or control the performance of products
Foreword i
Introduction i
1 Scope
2 Normative references
3 Terms and definitions
4 Summary of test methods
5 Apparatus
6 Samples
7 Test procedures
8 Expression of results
9 Test report
Annex A (Normative) Test device for ultraviolet light and heat resistance
Annex B (Normative) Items that can be expressed by test results, determination methods and representation methods
Bibliography
