Solutions for cleaning surfaces of copper and its alloys
OwnerHarry Ericson, Carl Otto Fredrikssoninventors
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Abstract
A solution for pickling copper and its alloys contains one or more mineral acids, such as sulphuric acid or phosphoric acid, in combination with hydrogen peroxide and a hydroxy acid, such as citric acid or gluconic acid, together with a nitrogen combination of the type substituted triazole and/or a tertiary amine of the general formula ##STR1## in which R is an aliphatic carbon chain containing less than 24 carbon atoms and the sum of n.sub.1 and n.sub.2 is less than 30.
Claims8
A solution for pickling copper and its alloys which contains 5 - 125 g/l of one or more mineral acids selected from the group consisting of sulphuric acid and phosphoric acid, 2 - 50 g/l hydrogen peroxide, 5 - 100 g/l hydroxy acid selected from the group consisting of citric acid and gluconic acid, and 0.01 - 5 g/l of one or more of the group consisting of benzotriazole and a tertiary amine of the general formula ##STR5## in which R is an aliphatic carbon chain containing less than 24 carbon atoms and the sum of n.sub.1 and n.sub.2 is less than 30.
A process for pickling a surface of copper and its alloys by providing a solution containing 5 - 125 g/l of one or more of the mineral acids selected from the group consisting of sulphuric acid and phosphoric acid, 2 - 50 g/l hydrogen peroxide, 5 - 100 g/l hydroxy acid selected from the group consisting of citric acid and gluconic acid, and 0.01 - 5 g/l of one or more of the group consisting of benzotriazole and a tertiary amine of the general formula ##STR7## in which R is an aliphatic carbon chain containing less than 24 carbon atoms and the sum of n.sub.1 and n.sub.2 is less than 30, and introducing the surface to be pickled into the solution.
The process of clain 6 wherein the tertiary amine is present in concentrations of 0.01 - 5 g/l aliphatic fatty amine of the formula ##STR8##
Dependencies are inferred from the claim text.