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Abstract

A process for plating aluminum alloy substrates (10), such as 390 aluminum alloy pistons (12), with iron comprises (a) plating on the aluminum substrate a layer of zincate from a zincate bath; (b) plating on the zincate layer a layer (14) of nickel from an electroless nickel bath; (c) plating on the nickel layer a layer (16) of iron from an iron ammonium sulfate bath; and (d) plating on the iron layer a layer (18) of tin from an alkaline tin bath. During the electroless plating, the zincate layer, which protects the underlying aluminum against oxidation, is sacrificed. All of these baths are environmentally much safer than cyanide and chloride. They are also cost effective and can be utilized in a totally closed loop plating system.

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First Claim