公开(公告)号：EP1034322A4

公开(公告)日：2001-03-21

申请号：EP98952024

申请日：1998-09-28

申请人： RUSSELL LARRY L

发明人： RUSSELL LARRY L

IPC分类号： C23F13/16 ,  C23F13/00

CPC分类号： C23F13/16 ,  C23F2201/00

摘要： Control of lead contamination in residential water supplies is accomplished by cathodic protection of lead-containg piping and lead-containing fixtures. Specifically, a partially insulated wire (3) is inserted into lead-containing service lateral piping (2). A pplication of a DC current to the partially insulated wire (3) causes the wire (3) to act as an anode and transforms the walls of the pipe (2) into the cathode, thereby protecting against corrosion. Alternatively, a sacrificial anode (14) is inserted into a lead-containing fixture (12). The electrical potential generated by corrosion of this sacrificial anode (14) transforms the walls of the fixture (12) into a cathode, thereby preventing corrosion. Carbonate scaling built-up prior to the initiation of cathodic protection may be removed by temporarily blocking the water pipe and introducing cleaning chemicals.