Alkanolamine-phosphoric acid anodizing electrolyte
AssigneeKemet Electronics Corporation
InventorsJohn Tony Kinard, Brian John Melody, David Alexander Wheeler
Life of this patent
Estimating the term…
Abstract
Electrolytes containing water, phosphoric acid, at least one organic solvent, and at least one alkanolamine can be used for anodizing valve metals prepared from metal powder having a surface area of least 0.35 m2/g or 35,000 CV/g. The anodizing electrolytes have relatively high conductivity and are capable of being used at high anodizing currents. The anodic film produced by these electrolytes on valve metals is of substantially uniform thickness and has improved electrical parameters.
Claims22
An aqueous anodizing electrolytic solution comprising about 0.1 vol % to about 2.0 vol % phosphoric acid, above about 1 vol % to about 70 vol % of at least one organic solvent and about 0.1 vol % to about 10 vol % of at least one alkanolamine, wherein the electrolytic solution is suitable for anodizing metal anodes.
A method of anodizing a metal anode from a valve metal powder comprising anodizing the metal anode with an aqueous anodizing electrolyte comprising about 0.1 vol % and about 2.0 vol % phosphoric acid, above about 1 vol % to about 70 vol % of at least one organic solvent and about 0.1 vol % to about 10 vol % of at least one alkanolamine, wherein the electrolytic solution is suitable for anodizing metal anodes.
A capacitor comprising an anode prepared from a valve metal powder comprising anodizing the metal anode with an aqueous anodizing electrolyte comprising about 0.1 vol % and about 2.0 vol % phosphoric acid, above about 1 vol % to about 70 vol % of at least one organic solvent and about 0.1 vol % to about 10 vol % of at least one alkanolamine, wherein the electrolytic solution is suitable for anodizing metal anodes.
Dependencies are inferred from the claim text.