Non-smutting acid etchant rinse for aluminum containing at...

Details Non-smutting acid etchant rinse for aluminum containing at... Non-smutting acid etchant rinse for aluminum containing at...

C - Chemistry, Metallurgy

23

G

149/20

C23G 1/02 (2006.01) C11D 7/08 (2006.01) C23G 1/12 (2006.01)

Patent

CA 1333991

Abstract of the Disclosure Problems with previously known aqueous acidic rinsing solutions for aluminum after shaping while using surface lubricants are avoided by use of a solution comprising water and (A) orthophosphoric acid in an amount to give a stoichiometric equivalent of 3.0 to 50 g/L as PO4-3, (B) an aluminum ion sequestrant component in an amount of 0.01 to 10.0 g/L; and (C) 20 to 170 ppm of ferric ion. Preferably the solution also contains 0.1 to 1.0 g/L of H2O2, NO2-1 ions, or a mixture thereof to reoxidize ferrous ions formed by reduction of ferric ions during use of the solution and thus maintain the concentration of ferric ions above 20 ppm at all times. The solution may also contain surfactant and up to 10 g/L of dissolved aluminum ions.

610432

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