发明名称 |
INTERNALLY TIN-PLATED COPPER PIPE MANUFACTURING METHOD |
摘要 |
A method of forming a layer of coating of tin on an inner surface of a copper pipe by passing a substitutional electroless tin plating liquid through an inner portion of the pipe, comprising a first plating step in which the plating is done by regulating a deposition rate of a layer of coating of tin so that a value obtained by dividing a total copper ion concentration in the portion of the plating liquid which has passed through the inner portion of the copper pipe and just flowed out therefrom by a concentration of bivalent tin ions in the same plating liquid becomes not more than 0.8, and a second plating step in which the plating is done with the temperature of the plating liquid set higher than that of the plating liquid in the first plating step. A plating liquid preferably used is a plating liquid containing 0.05-0.3 mol/l of positive bivalent Sn ion, 0.5-2.0 mol/l of thiourea, 0.5-2.0 mol/l of sulfuric acid, 0.05-2.0 mol/l of alkyl benzene sulfonic acid and 0.5-5.0 g/l of nonionic surface active agent. A corrosion resisting internally tin-plated copper pipe used as a water supply pipe, a hot water supply pipe and a heat exchanger pipe can be manufactured in the form of a long size coil, and a layer of coating of tin thus formed has small scatter of thickness, and high adhesion and a high corrosion resistance.
|
申请公布号 |
WO9746732(A1) |
申请公布日期 |
1997.12.11 |
申请号 |
WO1997JP01752 |
申请日期 |
1997.05.22 |
申请人 |
SUMITOMO LIGHT METAL INDUSTRIES, LTD.;ITO, JUNICHI;ATSUMI, TETSURO;YONEMITSU, MAKOTO;NISHIMOTO, YOSHIHIRO;OKAMURA, HIROSHI |
发明人 |
ITO, JUNICHI;ATSUMI, TETSURO;YONEMITSU, MAKOTO;NISHIMOTO, YOSHIHIRO;OKAMURA, HIROSHI |
分类号 |
C23C18/16;C23C18/31;(IPC1-7):C23C18/52 |
主分类号 |
C23C18/16 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|