Abstract
Effects of pH value, chloride ion concentration and alternation of wetting and drying time in acid rain on the corrosion of 35CrMn and Q235 steel were investigated through the measurement of polarization curves, electrochemical impedance spectroscopy, x-ray diffraction, and quantum mechanical calculations. The corrosion rate of 35CrMn and Q235 steel increased with decreasing pH values of the simulated acid rain, whereas the corrosion potential of 35CrMn and Q235 steel became more negative. The impedance became higher and the corrosion rate decreased with increasing test time. The dissolution rate of samples increased with chloride ion concentration. Results suggested that the corrosion rate of 35CrMn steel was obviously lower than that of Q235 steel for a more compact rust, α-FeOOH. Quantum chemical calculations further revealed that the increase in corrosion rate of the steel resulted from pitting corrosion caused by the corrosive chloride ion.
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The authors are grateful for assistance of Project No. CDJRC 11220002 supported by the fundamental research funds for the central universities and the natural science for youth fund of Chongqing University.
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Zuo, Xl., Xiang, B., Li, X. et al. Corrosion Behavior of 35CrMn and Q235 Steel in Simulated Acid Rain Conditions. J. of Materi Eng and Perform 21, 524–529 (2012). https://doi.org/10.1007/s11665-011-9931-2
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DOI: https://doi.org/10.1007/s11665-011-9931-2