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US 2018/0002818 A1Published application
Methods and Compositions for Acid Treatment of a Metal Surface
AssigneeHoughton Technical Corp.
InventorMores Basaly
Life of this patent
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Abstract
The invention relates to compositions and methods that are useful in etching a metal surface. In particular, the invention relates to novel acid compositions and methods of using such compositions in etching a metal surface, preferably an aluminum surface prior to anodizing to dissolve impurities, imperfections, scale, and oxide. The compositions are effective in maintaining their etching capacity and in removing smut produced by the etching of a surface as well as in general cleaning.
Claims20
(canceled)
A composition consisting essentially of:
- (a) one or more fluoride ion compounds;
- and
- (b) one or more grain refiners.
A composition consisting essentially of:
- (a) about 20 to about 80 grams per liter of ammonium bifluoride;
- and
- (b) about 1 to about 50 grams per liter of diammonium phosphate or a mixture of ammonium phosphate and diammonium phosphate.
A composition consisting essentially of:
- (a) about 20 to about 80 grams per liter of ammonium bifluoride;
- (b) about 1 to about 50 grams per liter of diammonium phosphate or a mixture of ammonium phosphate and diammonium phosphate;
- and
- (c) water.
1 more element
Dependencies are inferred from the claim text.