| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for removing an oxide film on the surface of a copper or copper-base alloy in which an oxide film is removed from a copper or copper-base alloy on which the oxide film is formed, and thereafter, a pickling solution including the oxide film is electrolyzed, thus a high purity copper or copper-base alloy can be efficiently recovered, and the pickling solution can be returned to a pickling bath and reused. <P>SOLUTION: A pickling solution 2, including: 50 to 400 g/L of sulfuric acid; 1 to 100 g/L of at least one oxidant selected from a group consisting of nitric acid, hydrogen peroxide, peroxodisulfate ions, and iron (III) ions; 0.01 to 10 g/L of at least one additive selected from a group consisting of aromatic sulfonic acid, aromatic sulfonate, and alkylamine; 0.005 to 10 g/L of at least one additive selected from a group consisting of alkylbenzene sulfonic acid and alkylbenzene sulfonate; and 10 to 300 g/L of copper sulfate, is used, and then reused as a pickling solution by adding, to the pickling solution Y after the electrolyisis, the oxidant and the additive Z whose amounts are equivalent to the consumed amount. <P>COPYRIGHT: (C)2013,JPO&INPIT |
