Abstract: The influence exerted by the addition of SO2,acidity of solution,temperature,immersion time and polarization potentials on corrosion behavior of X70 steel in weak acidic solutions were studied by means of potentiodynamic polarization curves and electrochemical impendence spectroscopy.The results showed that corrosion process of X70 steel in weak acidic solution with SO2 was controlled by anode reaction.The addition of SO2 promoted the anodic process of corrosion of X70 steel,increasing of the acidity and te...