Chemistry: electrical and wave energy – Processes and products
Patent
1989-08-23
1991-07-16
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204 384, 204 42, 204 58, C25D 902, C25D 906, C25D 1110
Patent
active
050322370
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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Martin Edward S.
Nitowski Gary A.
Wefers Karl
Wieserman Larry F.
Alexander Andrew
Aluminum Company of America
Gorgos Kathryn
Niebling John F.
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