Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Forming nonmetal coating
Patent
1992-07-22
1993-08-31
Niebling, John
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Forming nonmetal coating
205210, 205198, C25D 1130
Patent
active
052405893
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.
Mayekar Kishor
Niebling John
Technology Applications Group, Inc.
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