Patent ID: 9017563
Filing Date: 2015-04-28
Classification: C23C,C23G,H05K

Abstract:
1. A plating method of a circuit substrate for performing plating on a conductive pattern of a circuit substrate which comprises an insulating base material and the conductive pattern having a metal layer containing at least silver and copper as the outermost layer, the method comprising: a step (A) of treating the circuit substrate with a first liquid agent containing an oxidizing agent; a step (B) of treating the circuit substrate after the step (A) with a second liquid agent which dissolves copper oxide, and thereby removing copper oxide from a surface of the conductive pattern; a step (C) of treating the circuit substrate after the step (B) with a third liquid agent whose rate of dissolving silver oxide (I) at 25° C. is 1000 times or more faster than a rate thereof of dissolving copper (0) at 25° C., and thereby removing silver oxide from the surface of the conductive pattern; and a step (D) of performing electroless plating on the conductive pattern of the circuit substrate after the step (C), wherein where the conductive pattern has a layered structure comprising a plurality of metal layers, the outermost layer is the layer which is farthest from the insulating base material among the plurality of metal layers constituting the conductive pattern.