Stock material or miscellaneous articles – Composite – Of metal
Patent
1990-12-27
1992-06-30
Cashion, Jr., Merrell C.
Stock material or miscellaneous articles
Composite
Of metal
428457, 4284722, 4284723, 430278, 502401, 502407, B32B 1500
Patent
active
051262100
ABSTRACT:
A process is disclosed for treating the surface of a valve metal such as aluminum to form a two layer protective coating thereon using an anodizing bath consisting essentially of an aqueous solution having a concentration ranging from about 0.001 molar to a saturated solution of a monomeric phosphorus- containing compound selected from the class consisting of a 1-30 carbon water soluble phosphonic acid, a 1-30 carbon water soluble phosphinic acid, and mixtures thereof. The valve metal surface is anodized in the anodizing bath while maintaining a voltage selected from a range of from about 1 to about 400 volts until the current density falls to a level indicative of the fact that a nonporous valve oxide layer has been formed on the valve metal surface and a reaction product from the monomeric phosphonic/phosphinic acid compound is chemically bonded to the oxide layer.
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Application Ser. No. 07/624,793, Weiserman et al.
Martin Edward S.
Nitowski Gary A.
Wefers Karl
Wieserman Larry F.
Alexander Andrew
Aluminum Company of America
Cashion Jr. Merrell C.
Le Hoa T.
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