C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
C25D 5/34 (2006.01) C25D 11/30 (2006.01)
Patent
CA 2100168
A two-step process for coating magnesium and its alloys is disclosed. The first step comprises immersing the magnesium in an aqueous solution comprising about 0.2 to 5 molar ammonium fluoride at a temperature of about 40 to 100 °C. The second step is an electrochemical treatment 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 soluble hydroxide, about 2 to 15 g/L of a fluoride-containing composition, and about 5 to 30 g/L of an alkali metal silicate.
Bartak Duane E.
Lemieux Brian E.
Woolsey Earl R.
Robic
Technology Applications Group Inc.
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