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    • 3. 发明申请
    • METHOD OF REDUCING ELUTION OF LEAD IN LEAD-CONTAINING COPPER ALLOY, AND CITY WATER SERVICE FITTINGS MADE OF LEAD-CONTAINING COPPER ALLOY
    • 降低铅含铜合金铅含量的方法及含铅铜合金的城市用水配件
    • WO99028536A1
    • 1999-06-10
    • PCT/JP1998/005429
    • 1998-12-02
    • C23C22/24C23C22/33C23F1/00C25D5/14C25D5/34E03B7/09C23F1/34C23F1/44
    • E03B7/006C23C22/24C23C22/33C23F1/00C25D5/14C25D5/34Y10T29/4943
    • A processing method for preventing elution of lead in a lead-containing copper alloy for preventing elution of lead from faucet metals, etc., made of a lead-containing copper alloy, and a city water service fitting made of a lead-containing copper alloy for preventing elution of lead. Elution of lead remaining in a limited amount on the surface of a lead-containing copper alloy material can be prevented by forming a chromate film on this surface. The city water service fitting made of the lead-containing copper alloy is immersed in an alkaline etching solution in a pre-processing step of a nickel chromium plating step to selectively remove lead on the surface of the lead-containing copper alloy material and is then activated in a solution such as sulfuric acid and hydrochloric acid. Nickel plating is subsequently effected, and then chromium plating is effected in a sargent chromium or chromium fluoride bath, and a chromate film can be formed by immersing the city water service fitting in a chromate solution.
    • 一种用于防止含铅铜合金中的铅的析出以防止由含铅铜合金制成的来自水龙头金属等的铅的洗脱的铅和由含铅铜合金制成的城市用水配件 以防止铅的溶出。 通过在该表面上形成铬酸盐膜可以防止在含铅铜合金材料的表面上残留的有限量的铅的洗脱。 将由含铅铜合金制成的城市供水配件浸入镍铬镀层步骤的预处理步骤中的碱性蚀刻溶液中,以选择性地除去含铅铜合金材料的表面上的铅,然后 在溶液中活化,如硫酸和盐酸。 随后进行镀镍,然后在铬铬或氟化铬浴中进行镀铬,并且可以通过将城市用水配件浸入铬酸盐溶液中形成铬酸盐膜。