Aluminum electrolysis in non-aqueous monomeric organic acid
AssigneeAmerican Hoechst Corporation
InventorsThomas N. Gillich, John E. Walls
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Abstract
The invention is directed to the electrochemical treatment of aluminum substrates in a non-aqueous solution of a polybasic organic acid to provide a surface complex which promotes the adhesion of subsequently applied coatings to said surface.
Claims10
A process for treating an aluminum containing sheet substrate which comprises electrolyzing said substrate as an anode in a non-aqueous electrolytic solution comprising a solvent having a dipole moment of at least 1.5 and a compatible monomeric polybasic organic acid, wherein said electrolysis is conducted at a voltage of from about 5 to about 120 volts, with a charge application of from about 1 to about 150 coulombs per square decimeter of substrate, in an electrolyte maintained at a temperature of from about -5.degree. to about 60.degree. C., with a cathode to anode distance of from about 1 to about 25 centimeters.
Dependencies are inferred from the claim text.