| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for preventing a phenomenon in which lead is eluted from a fitting for feeding and draining water produced by a lead- containing copper alloy material into water when used. SOLUTION: A fitting for feeding and draining water made of a lead- containing copper alloy is dipped into an acid or neutral etching elution treating solution, lead and lead alloys precipitated on the surface are selectively removed, and the elution of lead into water in the case of using the fitting is prevented.
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