Chromate conversion coatings

摘要

Chromate conversion coatings are produced on various metals by chemical or electro- chemical treatment with mixtures of hexavalent chromium and certain other compounds. These treatments convert the metal surface to a superficial layer containing a complex mixture Of chromium compounds. The coatings are usually applied by immersion, although spraying, Brushing, swabbing, or electrolytic methods are also used. A number of metals and their alloys Can be treated, notably, aluminum, cadmium, copper, magnesium, silver, and zinc.