Patent ID: 9689084
Date: 2017-06-27
CPC Classifications: C25D

Claim:
1. An electrodeposition system comprising: a container containing a plating solution; three electrodes in said container and comprising: a signal generator generating a polarity-switching signal having a frequency; and a polarity-switching unit receiving said polarity-switching signal and being electrically connected to said first electrode, said second electrode and said third electrode, said polarity-switching unit being selectively operated in one of an active plating mode and a non-plating mode, during said active plating mode, said polarity-switching unit establishing a constant polarity state between said first electrode and said second electrode in said plating solution such that said first electrode has a negative polarity and said second electrode has a positive polarity, during said non-plating mode, said polarity-switching unit establishing an oscillating polarity state between said second electrode and said third electrode such that said second electrode and said third electrode have opposite polarities and such that said opposite polarities switch at regular intervals defined by said frequency, said third electrode being in said plating solution and said electrodeposition system further comprising a fourth electrode in said plating solution in said container and connected to said second electrode by a switch and further electrically connected to said polarity-switching unit, said third electrode and said fourth electrode comprising insoluble electrodes, said switch electrically disconnecting said fourth electrode from said second electrode in said active plating mode and electrically connecting said fourth electrode to said second electrode in said non-plating mode, and said polarity-switching unit establishing another oscillating polarity state between said fourth electrode and said third electrode during said plating mode.