Patent ID: 7300527
Filing Date: 2007-11-27
Classification: B08B,C25D,Y10S

Abstract:
1. A method for treating a substrate comprising: providing a substrate comprising grease on a surface thereof; contacting the substrate with supercritical carbon dioxide produced from pressurized carbon dioxide from a pressurized carbon dioxide source so that the grease on the surface of the substrate is separated or peeled off to perform degreasing cleaning; dissolving pressurized carbon dioxide from said pressurized carbon dioxide source in water to generate an oxide film removing solution comprising carbonated water; and contacting the substrate with the oxide film removing solution so as to remove oxide film on the surface of the substrate, the degreasing cleaning and oxide film removal being simultaneously performed and the degreasing cleaning and oxide film removal treatment being performed in a space that is not hermetically sealed; and providing a spray gun connected separately to the oxide film removing solution and to the supercritical carbon dioxide, wherein said contacting of the substrate with the supercritical carbon dioxide and said contacting of the substrate with the oxide film removing solution comprises simultaneously jetting the oxide film removing solution from a first jetting port and the supercritical carbon dioxide from a second jetting port formed in the spray gun.