Patent ID: 8257574

Claim:
A plating method for pre-plating or plating a cylinder inner peripheral surface to be treated of a cylinder block by introducing treatment liquid to the cylinder inner peripheral surface by using a plating apparatus provided with a sealing jig having a sealing member and an electrode to which the seal jig is mounted and an air pressure sensor for detecting a condition of sealing or sealed condition of the sealing member of the sealing jig, the method comprising the steps of: sealing the cylinder inner peripheral surface by bringing the sealing jig into contact with the cylinder inner peripheral surface; introducing the treatment liquid to the cylinder inner peripheral surface; and treating the cylinder inner peripheral surface by applying predetermined charge to the electrode of the plating apparatus and the cylinder block to thereby perform pre-plating or plating process in a state that a liquid to be treated fills a space including the cylinder inner peripheral surface, wherein the above steps are performed successively, and the treatment liquid introducing step is performed after confirmation of the sealing by the sealing step by bringing the sealing member into contact with the cylinder inner peripheral surface and wherein the confirmation comprises detecting the condition of sealing or sealed condition of the sealing member of the sealing jig using the air pressure sensor.