IP Library › Patent Application 13564880
Patent Application
App. No. 13/564,880

Methods and Compositions for Acid Treatment of a Metal Surface

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Patent No.
US None
App. No.
13/564,880
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.

Claims (23)

1 . 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.

2 . The composition according to claim 1 , which has a pH of about 2 to about 5.

3 . The composition according to claim 1 , further consisting of water.

4 . The composition according to claim 1 , consisting of about 5 to about 30 grams per liter of diammonium phosphate.

5 . The composition according to claim 1 , consisting of about 10 to about 20 grams per liter of diammonium phosphate.

6 . The composition according to claim 1 , consisting of about 60 to 70 grams per liter of ammonium bifluoride.

7 . A composition consisting 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.

8 . The composition according to claim 7 , which has a pH of about 2 to about 5.

9 . The composition according to claim 7 , consisting of about 5 to about 30 grams per liter of diammonium phosphate.

10 . The composition according to claim 7 , consisting of about 10 to about 20 grams per liter of diammonium phosphate.

11 . The composition according to claim 7 , consisting of about 60 to 70 grams per liter of ammonium bifluoride.

12 . A composition consisting 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; and

(c) water.

13 . The composition according to claim 12 , which has a pH of about 2 to about 5.

14 . The composition according to claim 12 , consisting of about 5 to about 30 grams per liter of diammonium phosphate.

15 . The composition according to claim 12 , consisting of about 10 to about 20 grams per liter of diammonium phosphate.

16 . The composition according to claim 12 , consisting of about 60 to 70 grams per liter of ammonium bifluoride.