Formation of Immersion Zinc Coatings on Aluminum

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Abstract
It has been recognized for many years that aluminum and its alloys require specific surface preparation for successful electrodeposition of the various metals. Such special treatment is necessary because of the high position of aluminum in the electromotive force series and because of the relatively impervious and rapidly formed oxide film. Many procedures for plating on aluminum have been presented in the literature, most of them falling into one of the following categories: (a) surface roughening or roughening plus heavy metal deposition by immersion prior to electroplating; (b) anodic oxidation followed by electrodeposition in the pores of the coating; (c) direct zinc plating prior to plating with other metals; (d) immersion deposition of zinc prior to plating with other metals. The zinc immersion procedure is now considered the most practical and economical of the various processes and, accordingly, has the greatest commercial application. In general, this procedure requires less time and equipment, is less critical to control, and has wider applicability than other known methods.

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