Stock material or miscellaneous articles – Composite – Of metal
Patent
1992-09-10
1993-11-30
Niebling, John
Stock material or miscellaneous articles
Composite
Of metal
428469, 428696, 428699, 428701, 428697, 428702, 205321, B32B 900
Patent
active
052664120
ABSTRACT:
A two-step process for the coating of magnesium and its alloys is disclosed. The first step comprises immersing the magnesium workpiece in a first electrochemical solution comprising about 3 to 10 wt-% of a hydroxide and about 5 to 30 wt-% of a fluoride having a pH of at least about 12. By controlling a current density to about 10 to 200 mA/cm.sup.2, an increasing voltage differential is established between an anode comprising the pretreated article and a cathode also in contact with the electrolytic solution. Next, the article is immersed in an aqueous electrolytic solution having a pH of at least about 11 and which solution is prepared from components comprising a water soluble hydroxide, a fluoride source and a water soluble silicate in amounts to result in an addition of about 2 to 15 g of a hydroxide per liter of solution, about 2 to 14 g of a fluoride per liter of solution and about 5 to 40 g of a silicate per liter of solution. Again, by controlling the current density to about 5 to 100 mA/cm.sup.2, an increasing voltage differential of at least about 150 volts is established between an anode comprising the pretreated article and a cathode also in contact with the electrolytic solution. This process results in a superior coating which has increased abrasion and corrosion resistance.
REFERENCES:
patent: 1574289 (1926-02-01), Keeler
patent: 3834999 (1974-09-01), Hradcovsky et al.
patent: 3956080 (1976-05-01), Hradcovsky et al.
patent: 4082626 (1978-04-01), Hradcovsky
patent: 4184926 (1980-01-01), Kojak
patent: 4620904 (1986-11-01), Kozak
patent: 4659440 (1987-04-01), Hradcovsky
patent: 4668347 (1987-05-01), Habermann et al.
patent: 4744872 (1988-05-01), Kobayashi et al.
patent: 4976830 (1990-12-01), Schmeling et al.
Bartak Duane E.
Lemieux Brian E.
Woolsey Earl R.
Mayekar Kishor
Niebling John
Technology Applications Group, Inc.
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