Patent ID: 8801912

Claim:
A method for a repeated electroplating of a workpiece to be plated as a cathode by using an insoluble anode in a plating vessel accommodating a copper sulfate plating bath, wherein a copper dissolution vessel different from the plating vessel is provided, the plating bath is transferred to the copper dissolution vessel and is returned from the copper dissolution vessel to the plating vessel for circulating the plating bath between the plating vessel and the copper dissolution vessel, copper oxide is charged into the copper dissolution vessel and dissolved in the plating bath so that copper ions consumed by the plating can be replenished, and the workpiece to be plated is continuously electroplated, characterized in that the anode and cathode isolated by a membrane which surrounds the anode and permits the plating bath to transfer between the anode side and cathode side, and the plating bath is transferred to a vicinity of the anode, between the anode and the membrane and in a direction along the anode, so that bubbles of oxygen gas in the vicinity of the anode are mixed with the transferred plating, bath, in said transport of the plating bath from the copper dissolution vessel to the plating vessel.