Anodising aluminium

Details Anodising aluminium Anodising aluminium

C - Chemistry, Metallurgy

25

D

204/24.6

C25D 9/12 (2006.01) C25D 11/12 (2006.01)

Patent

CA 1134774

Abstract of the Disclosure Method of anodising aluminum by subjecting it to electrol- ysis, first in a bath of electrolyte containing a borate and then in a bath of electrolyte containing an acid. Preferably, the electro- lyte in the first bath is about 3-5% borax with the pH adjusted to about 9 to 11 by addition of sodium hydroxide. The method forms an oxide coating which is of sufficient depth to comply with normal specifications and which also does not suffer from alkaline staining.

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