Process for electrolytically coloring aluminium and the alloys thereof
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United States of America Patent
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Feb 7, 1984
Grant Date -
N/A
app pub date -
Apr 20, 1981
filing date -
Apr 22, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides an improvement in the process for electrolytically coloring aluminum or an alloy thereof comprising the sequential steps of anodizing, coloring and fixing. In accordance with the improvement, the coloring step is conducted under conditions wherein the ratio between the concentration of the sulphuric acid used and the concentration of the color-producing salt or salts used is from 70:1 to 15:1, the concentration of the sulphuric acid being about 15 g/l and the salts used being metal sulphates, and wherein the peak voltage applied is from 10 to 45 volts and the temperature is about 25.degree. C. and wherein at the beginning of the coloring step of the process, the voltage is increased from 0 up to the peak voltage in a progressive and controlled manner.
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