Chemical method of avoiding a rainbow effect caused by the layer of oxide produced upon the brightening of parts of aluminum or aluminum alloys
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United States of America Patent
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Apr 23, 1991
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N/A
app pub date -
May 23, 1990
filing date -
May 26, 1989
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Abstract
There is described a chemical method for the avoidance of a rainbow effect which is caused by the layer of oxide produced upon the brightening of parts of aluminum or aluminum alloys, in which the parts are degreased or cleaned in a first process step and then subjected to electrolytic-alkaline brightening in a second process step, the method being characterized by the fact that, after the brightening, the parts are subjected to a further treatment in which the parts are first of all washed in water and then exposed in a chromic-acid solution preferably containing about 50 grams per liter of CrO.sub.3 at about 98.degree. C. for about 3 minutes and finally washed again in a sodium hydrosulfite solution.
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