发明名称 |
METHOD OF REDUCING ELUTION OF LEAD IN LEAD CONTAINING COPPER ALLOYS FOR DRINKING WATER SERVICE |
摘要 |
<p>It is an object of the present invention to provide a processing method for preventing elution of lead in a lead-containing copper alloy to prevent lead from eluting from a faucet metal, etc. made of a lead-containing copper alloy, and a drinking water service fitting made of a lead-containing copper alloy in which elution of lead has been prevented. By forming a chromate film on the surface of a lead-containing copper alloy material, it is possible to reduce elution of the lead left in a limited amount on the surface. A drinking water service fitting made of a lead-containing copper alloy is immersed in an alkaline etching solution in a pre-processing step for 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 may be formed by immersing the drinking water service fitting in a chromate solution. <IMAGE></p> |
申请公布号 |
EP1038990(A1) |
申请公布日期 |
2000.09.27 |
申请号 |
EP19980957126 |
申请日期 |
1998.12.02 |
申请人 |
TOTO LTD. |
发明人 |
KAWAMOTO, MASASHI;GOTOU, AKIRA;IMAMOTO, MITUO |
分类号 |
C23C22/24;C23C22/33;C23F1/00;C25D5/14;C25D5/34;E03B7/09;(IPC1-7):C23F1/34;C23F1/44 |
主分类号 |
C23C22/24 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|