The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 2001
Filed:
Feb. 03, 1994
Sue Troup-Packman, Calabasas, CA (US);
Hughes Electronics Corporation, El Segundo, CA (US);
Abstract
A process for plating aluminum alloy substrates (,), such as 390 aluminum alloy pistons (,), 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 (,) of nickel from an electroless nickel bath; (c) plating on the nickel layer a layer (,) of iron from an iron ammonium sulfate bath; and (d) plating on the iron layer a layer (,) 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.