The corrosion behviors of A3 steel in water with different concentrations of Cl~-,SO_4~(2-) and S~(2-) were studied by electrochemical impedance spectroscopy and polarization curves.The results show that Cl~-,SO_4~(2-) and S~(2-) impact the corrosion of A3 steel greatly.At the same concentration,the corrosion rate could be ranked in the order of S~(2-)>Cl~->SO_4~(2-).The corrosion potential shifted towards negative direction and the corrosion current increased gradually with the increase of S~(2-),Cl~- and ...