Stock material or miscellaneous articles – Composite – Of metal
Patent
1994-07-06
1995-11-28
Gorgos, Kathryn
Stock material or miscellaneous articles
Composite
Of metal
428696, 428699, 428701, 428702, B32B 1504
Patent
active
054706645
ABSTRACT:
A two-step process for the coating of magnesium and its alloys is disclosed. The first step comprises immersing the magnesium workpiece in an aqueous solution comprising about 0.2 to 5 molar ammonium fluoride having a pH of about 5 to 8 and a temperature of about 40.degree. to 100.degree. C. The second step is an electrochemical treatment of the pretreated article in an aqueous electrolytic solution having a pH of at least about 12.5 and which solution comprises about 2 to 12 g/L of a aqueous soluble hydroxide, about 2 to 15 g/L of a fluoride-containing composition selected from the group consisting of fluorides and fluorosilicates, and about 5 to 30 g/L of a silicate. This process results in a superior coating which has increased abrasion and corrosion resistance.
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Bartak Duane E.
Lemieux Brian E.
Woolsey Earl R.
Gorgos Kathryn
Mayekar Kishor
Technology Applications Group
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