ISO 10074:2021 Anodizing of aluminium and its alloys — Specification for hard anodic oxidation coatings on aluminium and its alloys

标准简介

Anodizing of aluminium and its alloys — Specification for hard anodic oxidation coatings on aluminium and its alloys是国际标准化组织(International Organization for Standardization，简称ISO)于2021-05发布的ISO标准，适用于全球。

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Anodizing of aluminium and its alloys — Specification for 

hard anodic oxidation coatings on aluminium and its alloys

1 Scope

This document specifies requirements for hard anodic oxidation coatings on aluminium and its alloys, including test methods.

It also specifies the information to be supplied by the customer to the anodizer (see Annex A).

It is not applicable to coatings produced by processes such as those referred to as plasma electrolytic oxidation, micro-arc oxidation, plasma-chemical anodic oxidation, anodic spark deposition or spark anodizing.

2  Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. 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 2106, Anodizing of aluminium and its alloys — Determination of mass per unit area (surface density) of anodic oxidation coatings — Gravimetric method

ISO 2360, Non-conductive coatings on non-magnetic electrically conductive base metals — Measurement of coating thickness — Amplitude-sensitive eddy-current method

ISO 2376, Anodizing of aluminium and its alloys — Determination of breakdown voltage and withstand voltage

ISO 4516, Metallic and other inorganic coatings — Vickers and Knoop microhardness tests

ISO 6344-1, Coated abrasives — Grain size analysis — Part 1: Grain size distribution test

ISO 7583, Anodizing of aluminium and its alloys — Terms and definitions

ISO 8251, Anodizing of aluminium and its alloys — Measurement of abrasion resistance of anodic oxidation coatings

ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests

3  Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 7583 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www. iso. org/o bp

— IEC Electropedia: available at http:// www.e lectropedia. org/ 3.1

lot

articles of the same nominal composition and temper which are processed together

3.2

lot acceptance test

test on a production lot (3.1) to determine its conformity to specified requirements

4  Material classification

The properties and characteristics of hard anodic oxidation coatings are significantly affected by both the alloy and the method of production.

Consequently, for the purposes of this document, materials are classified into five alloy groupings as follows.

— Class 1: all wrought alloys except those in Class 2.

— Class 2 (a): alloys of the 2 000 series and any other alloys that contain more than 5 % copper.

— Class 2 (b): alloys of the 5 000 series containing 2 % or more magnesium and alloys of the 7 000 series.

— Class 3 (a): casting alloys with less than 2 % copper and/or 8 % silicon.

— Class 3 (b): other casting alloys.

Information to be supplied by the customer to the anodizer shall be in accordance with Annex A.

5  Appearance

The significant surface shall be completely anodized. The visual appearance shall be substantially uniform. There shall be no spalling, blistering or powdery (burnt) areas. Visual examination shall be a lot acceptance test.

Crazing or microcracks shall not normally be a reason for rejection.

6  Thickness

Thickness measurements shall be made on the significant surfaces, but not within 5 mm of contact (jigging) marks, nor in the immediate neighbourhood of a sharp edge.

Measurement shall be made using either the non-destructive eddy current method described in ISO 2360 or the destructive microscopical method described in ISO 1463. In the case of a dispute, the microscopical method (ISO 1463) shall be used.

Measurement of thickness or, where relevant, final dimensions shall be dealt with in a lot acceptance test.

7  Surface density

The surface density (coating mass per unit area), when measured in accordance with ISO 2106 on unsealed anodic oxidation coatings with a nominal thickness of 50 μm ± 5 μm, shall have the minimum values given in Table 1.

If the coating thickness is not 50 μm, the surface density shall be corrected proportionately.

WARNING  —  A  method  specified  in  ISO  2106  requires  the  use  of  a  reagent  containing 

chromium(VI). Chromium(VI) is toxic and its solutions are hazardous to the environment and 

severely hazardous to waters.

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