METHOD FOR PRODUCING APPARATUS FOR CITY WATER MADE OF LEAD-CONTAINING COPPER ALLOY, AND TREATMENT METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide an achievable method regarding both of lead and nickel in the reduction of the elution amounts to water from the inner circumferential face of a water passage in an apparatus for city water.SOLUTION: The production method is provided with: a plating step S10; a first treatment step S11; a second treatment stage S12; a third treatment step S13; and a fourth treatment step S14. In the first treatment step S11, a mixed acid aqueous solution of nitric acid and hydrochloric acid is prepared as a first treatment solution, and a first workpiece W1 after being subjected to the plating step S10 is dipped into the first treatment solution so as to obtain a second workpiece W2. In the second treatment step S12, a BTA aqueous solution is prepared as a second treatment solution, and the second workpiece W2 is dipped into the second treatment solution so as to obtain a third workpiece W3. In the third treatment step S13, a sodium hydroxide aqueous solution is prepared as a third treatment solution, and the third workpiece W3 is dipped into the third treatment solution so as to obtain a fourth workpiece W4. In the fourth treatment step S14, a phosphoric acid aqueous solution is prepared as a fourth treatment solution, and the fourth workpiece W4 is dipped into the fourth treatment solution.