Appeal No. 2002-0834
Application 09/275,386
APPENDIX
1. An aqueous liquid composition that is suitable either as
a concentrate, after dilution with water, or both as a
concentrate and after dilution with water, for deoxidizing
etching of aluminum surfaces by contact therewith, said
composition comprising water and:
(A) a component of dissolved acid with a larger ionization
constant in water than that of either fluoroboric acid or boric
acid;
(B) a component of dissolved fluoroborate anions;
(C) a component of dissolved oxidizing agent that is not
part of either of components (A) or (B) as recited next above;
and
(D) a component of dissolved organic molecules that contain
a five-membered ring structure said ring structure including at
least one nitrogen atom, said dissolved organic molecules not
being part of any of components (A) – (C) as recited next above.
4. An aqueous liquid composition according to claim 3,
wherein:
- component (A) consists of a concentration of nitric acid
that is from about 44 to about 70 g/l;
- component (B) is present in a concentration that is from
about 1.50 to about 3.0 g/l and is derived from
fluoroboric acid, its salts, or both;
- the ratio of the concentration of dissolved fluoroborate
anions to dissolved nitric acid in the composition is
from 0.029:10 to 0.055:1.0;
- component (C) consists of from about 25 to about 40 g/l
of hydrogen peroxide;
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