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BS EN 4827:2017

BS EN 4827:2017

$102.76

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

Published By Publication Date Number of Pages
BSI 2017 22
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This European Standard defines the requirements for hexavalent chromium free anodizing of aluminium and aluminium alloys for corrosion protection, bonding and painting.

Hard anodizing is not covered by this European Standard.

The purpose of this European Standard is to give design, quality and manufacturing requirements. It does not give complete in-house process instructions; these shall be given in the manufacturers detailed process instructions.

PDF Catalog

PDF Pages PDF Title
6 1 Scope
2 Normative references
7 3 Purpose of process
3.1 Applicability
3.1.1 Type A: unsealed anodizing
3.1.2 Type B: sealed anodizing
8 3.2 Limitations
4 Terms and definitions
9 5 Protection system classification
5.1 System types
5.2 Layer thicknesses
10 6 Process requirements
6.1 Information for the processor
6.2 Condition of parts prior to the treatment
6.3 Process conditions
6.3.1 Tooling
11 6.3.2 Masking
6.3.3 Surface pre-treatment
6.3.4 Anodizing
6.3.5 Anodizing post treatments
12 6.4 Water quality
6.4.1 Anodizing bath
6.4.2 Sealing and dyeing bathes
6.4.3 Rinsing bath
6.5 Re-anodizing
7 Engineering requirements
7.1 General
7.2 Visual aspects
7.3 Film thickness
13 7.4 Corrosion prevention performance of unpainted parts
7.5 Paint adhesion on anodic film
7.6 Corrosion prevention performance of painted parts
7.6.1 Filiform corrosion
7.6.2 Corrosion resistance
14 7.7 Fatigue requirements
7.8 Bonding check
8 Quality requirements
8.1 Process approval
8.2 General points
15 8.3 Periodic tests
8.4 Periodic chemical analysis
8.5 Parts acceptance controls
8.5.1 Controls before treatment
8.5.2 Controls during treatment
8.5.3 Controls after anodizing
17 B.1 Quality requirements
B.2 Interpretation of the results of the dye-spot test

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BS EN 4827:2017
$102.76