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BS EN 4827:2024

BS EN 4827:2024

$167.15

Aerospace series. Hexavalent chromium free anodizing of aluminium and aluminium alloys

Published By Publication Date Number of Pages
BSI 2024 36
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This document specifies the requirements for hexavalent chromium free anodizing of aluminium and aluminium alloys for corrosion protection, bonding and painting. This document does not apply to hard anodizing and plasma electrolytic anodizing (micro-arc oxidation). The purpose of this document is to give design, quality and manufacturing requirements. It does not give complete in-house process instructions; these are given in the processor’s detailed process instructions.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
9 3 Terms and definitions
3.1 General terms
3.2 Technical terms
11 4 General principles of the process
4.1 Purpose of the process
4.2 Applicability
4.2.1 Type A: unsealed anodizing
4.2.2 Type B: sealed anodizing
12 4.3 Limitations
4.4 Classification
4.4.1 System types
13 4.4.2 Layer thickness
5 Process requirements
5.1 Information for the processor
5.2 Process conditions
5.2.1 Tooling
14 5.2.2 Masking
5.2.3 Surface preparation
5.2.4 Anodizing
5.2.5 Anodizing post-treatments
15 5.3 Water quality
5.3.1 General
5.3.2 Anodizing bath
5.3.3 Sealing and dyeing baths
5.3.4 Final rinsing bath
5.4 Periodic bath chemical analysis
16 5.5 Re-anodizing
6 Test specimen requirements
6.1 Definition of test specimens
6.1.1 General
6.1.2 For the qualification
6.1.3 For periodic tests
20 6.2 Tests for the qualification
6.3 Periodic tests
7 Parts requirements
7.1 Condition of parts prior to the treatment
21 7.2 Inspections before the treatment
7.3 Inspections during the treatment
7.4 Inspections on parts after anodizing
8 Quality assurance
8.1 Process approval
8.2 General points
22 8.3 Qualification procedure
23 Annex A (normative)Tests on test specimens for the qualification
27 Annex B (normative)Periodic tests on test specimens
31 Annex C (normative)Levels of requirements for corrosion resistance of thin film anodizing on unpainted test specimens
32 Annex D (normative)Tests on parts
33 Annex E (normative)Dye-spot test
E.1 Dye-spot
E.2 Dye solution A
E.3 Dye solution B

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BS EN 4827:2024
$167.15