GB/T 20892-2020 in English

《GB/T 20892-2020镨钕金属》由TC229（全国稀土标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Specification for anodic coatings for aluminum and aluminum alloys

1 Scope

This standard specifies the requirements of anodic coatings for aluminum and aluminum alloys of 6 types and 2 categories.

This standard is applicable to anodic coatings for aluminum and aluminum alloys for protection and decoration in electronic industry.

This standard is not applicable to anodic coatings for bonding.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references or references with version not indicated, the latest edition of the normative document referred to applies.

GB/T 3181 Colour standard for paint film
GB/T 4957 Non-conductive coatings on non-magnetic basis metals—Measurement of coating thickness—Eddy current
GB/T 6462 Metallic and oxide coatings—Measurement of coating thickness—Microscopical method
GB/T 8015.1 Test methods for thickness of anodic oxidation coatings on aluminium and aluminium alloys—Gravimetric method
GB/T 11186.3 Methods for measuring the colour of paint films—Part 3: Calculation of colour differences
GB/T 11189.1 Operating light-exposure apparatus (xenon-arc type) with and without water and testing method for exposure of nonmetallic materials
GB/T 11189.2 Operating light-exposure apparatus (carbon-arc type) with and without water and testing method for exposure of nonmetallic materials
GB/T 11190 Operating light-and water-exposure apparatus (carbon-arc type) and testing method for testing paint, varnish, lacquer, and related products
GJB 150.11 Environmental test methods for military equipment—Salt fog test
GJB 179A-1996 Sampling procedures and tables for inspection by attributes

GJB 385A-1996 Specification for alphatic polyurethane enamels and compatible for aircraft skin application

3 Terms and definitions

For the purpose of this standard, the following terms and definitions apply.

3.1
pit
local corrosion with greater depth than width. Under normal circumstances, it shows line and tail shape

3.2
delamination
separation of two adjacent layers due to lack of viscosity

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Requirements
6 Inspection methods
Annex A (Normative) Test methods for abrasion index