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Abstract The effect of SO2 on the corrosion behavior of Q235B steel in simulated marine atmosphere was investigated by XRD， SEM， mass loss analysis and a wet/dry alternate immersion corrosion test using 0.1 mol/L NaCl solution and 0.1 mol/L NaCl＋0.01 mol/L NaHSO3 solution. The results indicate that SO2 pollution significantly increases the corrosion depth of Q235B steel. The corrosion processes of Q235B steel show a good agreement with the power function of [W＝Atn，]and the corrosion products are mainly composed of amorphous phase and a small amount crystals of Fe3O4、α-FeOOH、β-FeOOH、γ-FeOOH. However， the values of parameters [A，][n]and the amount of each crystal are changed before and after SO2 pollution. SO2 and Cl- are synergies in the corrosion process of Q235B steel， but their mechanisms of action are different. Cl－ can prevent the adsorption of corrosion products， and promote them falling， thereby inhibiting the formation of protective rust layer. While SO2 will react with the steel substrate and rust layer during its acidification process， which will lead to the destruction of rust layer structure and the deterioration of corrosion resistance of the steel. In addition， SO2 can inhibit the formation of β-FeOOH and promote the formation of α-FeOOH generated， thereby inhibit the role of Cl－ and improve the stability of the rust layer. However， as the rust layer thickness increases， the inhibition of SO2 reduces， and the inner rust layer becomes loose.
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Received: 23 May 2016
Published: 13 January 2017
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2017, Vol. 52 
