INFLUENCE OF SATURATED H$_2$S ON CORROSION BEHAVIOR OF 316L STAINLESS STEEL

The corrosion behavior of 316L stainless steel in H_2S-HCl-H_2O environment at 80℃was investigated by potentiodynamic polarization curves,electrochemical impedance spectroscopy(EIS)and electrochemical noise(EN).The parameters derived from shot noise theory combined stochastic theory had been employed to analyze the corrosion mechanism of 316L stainless steel in H_2S-HCl-H_2O environment at 80℃.The polarization curves of 316L stainless steel indicated that there existed an obvious passivation characteristic without H_2S,and active dissolution with saturated H_2S.The corrosion process of 316L stainless steel was promoted greatly with addition of saturated H_2S.An analysis of the electrochemical noise data based upon the combined stochastic theory and shot-noise theory showed that the characteristic frequency of corrosion of 316L stainless steel were increased and the development of corrosion of 316L stainless steel became much easy with addition of saturated H_2S.