Low voltage hard anodizing process

Details Low voltage hard anodizing process Low voltage hard anodizing process

C - Chemistry, Metallurgy

25

D

204/24.5

C25D 11/04 (2006.01) C25D 11/06 (2006.01)

Patent

CA 1134316

LOW VOLTAGE HARD ANODIZING PROCESS ABSTRACT A process for hard anodizing of aluminum and alum- inum alloys uses a low DC carrier voltage on which an AC voltage is superimposed. The process enables the electro- lyte to have a lower acid concentration than is usual in con- ventional hard anodizing methods while tolerating higher bath temperatures than are usual. In the process, the DC carrier voltage is kept within the range of 14 to 20 volts for an extended period of time. Preferably, modulation of the DC carrier by the AC voltage does not exceed 100%.

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