公开(公告)号：EP1144734A2

公开(公告)日：2001-10-17

申请号：EP99973673.9

申请日：1999-11-12

申请人： Polytechs, Inc. ,  Ritt, Roswitha

发明人： INOUE, Akito

IPC分类号： C25D13/00

CPC分类号： C25D13/22

摘要： Electrodeposition (ED) systems and methods are disclosed where acid control is possible without adding acid from outside when acid tends to be depleted. A mixture of high neutralizer removal type membrane electrodes and low neutralizer removal type membrane electrodes are placed in an ED tank. To each of these two types of electrodes separate and independent electrolyte circulation systems are connected. To each of these circulation system are connected each correspondingly first and second electrolyte conductivity control means, each of which works to add D.I. water, as a dilution media, to corresponding electrolyte circulation system, when the conductivity exceeds pre-set reference conductivity values. The reference conductivity set point at which value the second electrolyte control means will add D.I. water to the second electrolyte circulation system preferably is set higher than the reference conductivity set point at which value the first electrolyte control means will add D.I. water to the first electrolyte circulation system.