Process for anodizing aluminum and its alloys

Details Process for anodizing aluminum and its alloys Process for anodizing aluminum and its alloys

C - Chemistry, Metallurgy

25

D

204/24.5

C25D 11/04 (2006.01)

Patent

CA 1046978

ABSTRACT OF THE DISCLOSURE A method of anodizing aluminium and its alloys utilizing a suitable anodizing electrolyte and a pulsed direct current. The direct current used provides a substantially constant anodizing current interspersed with at least six pulses per second of higher, smoothly peaked, direct current. It has been found that the greater the number of pulses per second, the more superior the anodic coating obtained. The electrolyte used can be sulfuric acid (125 to 300 grams of sulfuric acid per liter of water) preferably containing a 0.1 to 0.2 grams per liter of sodium lignosulfonate or other such sulfonated organic compound as a stabilizer. A mixture of sulfosalicylic acid and sulfuric acid or a mixture of sulfuric and oxalic acid can be used.

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