Conversion Coatings on Composite Metal Articles

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Abstract
The usual phosphating and chromating methods employed for individual steel, zinc and aluminium differ from one another with regard to treatment time, temperature and specific bath composition. Thus they cannot be used for treating composite metal articles. Zinc phosphate solutions containing only minor amounts of fluoride ions can be used for treating articles where the proportion of aluminium surface, based on the total area, is not greater than about 5%. By increasing the fluoride content a new solution has been developed which permits the production of fine-grained, dense, homogeneous and strongly corrosion-resistant coatings on work-pieces comprising any arbitrary proportion of the total surface area in the form of steel, zinc or aluminium.

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