WATER FOR REMOVING OXIDE FILM OR RUST OF METAL, AND METHOD FOR REMOVING OXIDE FILM OR RUST OF METAL USING THE WATER FOR REMOVING OXIDE FILM OR RUST OF METAL

摘要

PROBLEM TO BE SOLVED: To provide water for removing the oxide film or rust of metal without using highly harmful specified chemical substances, and to provide a method for removing the oxide film or rust of metal using the water.;SOLUTION: Acid water obtained by electrolyzing raw water comprising 20 to 20,000mg/L sulfuric acid ions, and having pH of 0.5 to 4.0, a residual chlorine concentration of ≤10mg/L, an oxidation-reduction potential of 300 to 1,150mV, a sulfuric ion concentration of 30 to 30,000mg/L and an electrical conductivity of ≤10S/m is used. Further, ultrasonic vibration is applied to the acid water, so that the removal of an oxide film can be performed with high quality in a short period of time.;COPYRIGHT: (C)2004,JPO