CORROSION MECHANISM OF A3 STEEL INDUCED BY CHLORIDE IONS IN THE PURIFIED WATER

摘要

The corrosion mechanism of A3 steel induced by chloride ions in the purified water had been investigated with the A C Impedance technique. The results showed that there were another two factors which determined its electrochemical corrosive rate: the electrode potential and coverage ratio of chloride ions on the surface of A3 Steel. The corrosion mechanism of A3 steel in the solution with chloride ions emendation was two steps of electrode process with the rate-determining step of FeCl->k_(0.3)Fe~(2+)+Cl~-+e~-.