The corrosion mechanisms of carbon steel and weathering steel in SO2 polluted atmospheres

Abstract The atmospheric corrosion performance of carbon steel (SS400) and high phosphorus weathering steel (Acr-Ten A) exposed indifferent atmospheric environments was studied and compared after exposure for various periods (up to 6 years) in Taiwan, In an industrial atmosphere, the corrosion kinetics of weathering steel was found to deviate from the behavior predicted by the well-known bilogarithmic law after 3 years' exposure. The results of atmospheric exposure tests, rust structure analyses and electrochemical impedance measurements were integrated in this study to investigate the abnormal corrosion behavior, of weathering steel deviating from the bilogarithmic law. Furthermore, this deviation phenomenon was adequately simulated by an accelerated laboratory test under cyclic wet/dry conditions with the addition of SO 2 .

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