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BS EN ISO 3613:2021 – TC

BS EN ISO 3613:2021 – TC

$134.27

Tracked Changes. Metallic and other inorganic coatings. Chromate conversion coatings on zinc, cadmium, aluminium-zinc alloys and zinc-aluminium alloys. Test methods

Published By Publication Date Number of Pages
BSI 2021 46
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This document specifies methods for the determination of

  1. the presence of colourless chromate conversion coatings,

  2. the presence of hexavalent chromium in colourless and coloured coatings on zinc or cadmium or aluminium-zinc (mass fraction of aluminium: 55 %, within a range of 54 % to 56 % mass fraction) and zinc-aluminium (mass fraction of aluminium: 5 %) alloys,

  3. the total chromium content per unit area on zinc and cadmium,

  4. the mass per unit area of both colourless and coloured coatings,

  5. the satisfactory adhesion of chromate conversion coatings, and

  6. the quality of chromate coatings.

These methods are applicable to

  1. colourless and coloured chromate conversion coatings containing trivalent and hexavalent chromium in varying proportions and produced by either chemical or electrochemical processes, and

  2. chromate coatings that are free from any supplementary coatings, such as oil, water or solvent-based polymers or wax.

PDF Catalog

PDF Pages PDF Title
1 30443362
27 A-30394407
28 National foreword
30 European foreword
32 Foreword
33 Introduction
35 1 Scope
2 Normative references
3 Terms and definitions
36 4 Reagents
4.3.1 Test solution C 1.
4.3.2 Test solution C 2.
37 4.6 Ammonium persulfate [(NH4)2S2O8].
5 Apparatus
38 6 Test methods
6.1 General
6.2 Test for the presence of a colourless chromate coating on zinc
6.3 Test for the presence of a colourless chromate coating on zinc and cadmium
39 6.4 Test for the presence of a colourless chromate coating on zinc-aluminium (mass fraction of aluminium: 5 %) alloys
6.5 Test for the presence of hexavalent chromium in both colourless and coloured chromate coatings
6.5.1 General
6.5.2 Test method employing test solution C 1
6.5.3 Test method employing alternative test solution C 2 (destructive)
40 6.5.4 Expression of results
41 6.5.5 Calibration of spectrophotometer
42 6.6 Determination of hexavalent chromium content of coloured chromate coatings
6.6.1 Preparation of calibration graph
6.6.2 Blank test
6.6.3 Determination
6.6.4 Expression of results
6.7 Determination of total chromium content of coloured chromate coatings
6.7.1 Preparation of calibration graph
6.7.2 Blank test
43 6.7.3 Determination
6.7.4 Expression of results
6.8 Determination of mass per unit area of both colourless and coloured chromate coatings by gravimetric method
6.9 Test for adhesion by abrasion
6.10 Quality evaluation test of chromate layers on zinc and cadmium surfaces
44 7 Test report
45 Bibliography

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BS EN ISO 3613:2021 - TC
$134.27