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Corrosion Inhibition and Adsorption Behavior of Green Corrosion Inhibitor SDDTC on AZ31B Mg-alloy |
Haiyuan WANG1, Yinghui WEI1,2(), Huayun DU1, Baosheng LIU1, Chunli GUO1, Lifeng HOU1 |
1 College of Materials Science and Engineering, TaiYuan University of Technology, Taiyuan 030024, China 2 Shanxi Institute of Technology, Yangquan 045000, China |
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Abstract The corrosion inhibition and adsorption behavior of sodium diethyldithiocarbamate (SDDTC) on AZ31B Mg-alloy in 3.5% (mass fraction) NaCl solution were investigated by means of potentiodynamic polarization measurement, electrochemical impedance spectroscopy (EIS), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Results showed that SDDTC could inhibit effectively the corrosion for AZ31B Mg-alloy in NaCl solution, and acted as a mixed-type inhibitor with predominant control of the cathodic reaction. When the concentration of SDDTC was 5 mmolL-1, the inhibition efficiency was the best. The physical adsorption of SDDTC on the AZ31B Mg-alloy surface obeyed the Langmuir adsorption isotherm. While SDDTC adsorbed on the surface of Mg-alloy forms a much compact protective film, effectively inhibiting the corrosion of AZ31B Mg-alloy.
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Received: 03 January 2017
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Fund: Supported by National Natural Science Foundation of China (51374151), Key Scientific Research Project in Shanxi Province (MC2016-06 and 201603D111004) and Shanxi Scholarship Council of China (2017-029) |
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