Electrocoloring of anodized aluminum: Part II—Using mixed carboxylic acids

Electrolytic coloring is a two-stage process involving a second electrolytic deposition process after sulfuric acid anodizing. The effect is to deposit a suitable metal at the base of the pores of the anodic coat. Initial experiments of electrocoloring after anodizing were carried out in a number of...

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Veröffentlicht in:Metal finishing 1997-12, Vol.95 (12), p.33,36-34,38
1. Verfasser: El Magd, MReda Gad Abu
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description Electrolytic coloring is a two-stage process involving a second electrolytic deposition process after sulfuric acid anodizing. The effect is to deposit a suitable metal at the base of the pores of the anodic coat. Initial experiments of electrocoloring after anodizing were carried out in a number of organic acids such as sulfamic, benzoic, gallic, and maleic. In all cases, the coating was found to be streaky, nonuniform, and coarse-grained, and the quality of the deposit was not promising.
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subjects Aluminum
Anodic oxidation
Carboxylic acids
Coatings
Electric conductivity
Electrodeposition
Sulfuric acid
Thermodynamic stability
title Electrocoloring of anodized aluminum: Part II—Using mixed carboxylic acids
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