Aqueous liquid deoxidizing compositions methods of preparing them and processes for deoxidizing-etching aluminum therewith

摘要

Aqueous liquid compositions suitable (as such and/or after dilution with further water) for the deoxidizing-etching of aluminum surfaces by contact therewith which, besides water, comprise: (A) a component of one or more dissolved acid(s) with an ionization constant in water larger than that of either fluoroboric acid or boric acid; (B) a component of one or more dissolved fluoroborate anion(s); (C) a component of one or more dissolved oxidizing agent(s) not being part of either of components (A) or (B); and (D) a component of one or more dissolved organic molecule(s) that contain a five- membered ring structure that includes at least one nitrogen atom, said dissolved organic molecules not being part of any of components (A)-(C).