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DIN EN ISO 2143:2018 Edition

DIN EN ISO 2143:2018 Edition

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Anodizing of aluminium and its alloys – Estimation of loss of absorptive power of anodic oxidation coatings after sealing – Dye-spot test with prior acid treatment

Published By Publication Date Number of Pages
DIN 2018-09 14
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This document specifies a method of estimating the loss of absorptive power of anodic oxidation coatings that have undergone a sealing treatment, by dye absorption after acid pretreatment. The method is suitable for use as a production control method and is applicable to anodic oxidation coatings which may be subjected to weathering or aggressive environments, or where resistance to staining is important. The method is not applicable to those coatings that: a) are formed on alloys containing more than 2 % copper or 4 % silicon; b) are sealed by the dichromate process; c) have been given supplementary processing; for example, oiling, waxing or lacquering; d) are coloured in deep shades; e) are less that 3 µm thick. The method is less appropriate where nickel or cobalt salts, or organic additives, have been added to the sealing bath.

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DIN EN ISO 2143
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