| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface treatment method for a lead-containing alloy for preventing the elution of lead on use. SOLUTION: A lead-containing copper alloy is brought into contact with a chemical conversion treatment solution containing metallic ions of one or more kinds selected from Zn, Fe, Mn, Ca, Ni, Cu, Co, Zr, Sn, Mg and Al, phosphoric ions and nitrate ions. The chemical conversion treatment solution can contain one or more kinds selected from nitrite ions, hydrogen peroxide and peroxo compounds. Prior to chemical conversion treatment, as pretreatment, one or more selected from degreasing, pickling and surface control can be performed. On the pickling, a pickling solution containing fluorine ions and nitrate ions or a pickling solution containing a surfactant and/or a chelating agent can be used. COPYRIGHT: (C)2003,JPO
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