Experimental study of electrochemical corrosion behaviour of bilayer on AZ31B Mg alloy |
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| Authors: | Xinghua Guo Maozhong An |
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| Affiliation: | aSchool of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, China;bState Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Science, Shenyang, China;cState Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China |
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| Abstract: | A bilayer on AZ31B magnesium alloy was prepared by first applying anodization to modify the substrate, and then depositing a self-assembled nanophase particle (SANP) film. Structure and corrosion behaviour are characterized by scanning electron microscopy, energy dispersion spectrometry, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscope and electrochemical impedance spectroscopy. Experimental results indicate that the bilayer consists of a SNAP/loose layer and a dense layer, and provides the corrosion protection of Mg substrate for more than 354 h in 0.005 M NaCl solution. Therefore, the bilayer is effective to protect Mg alloy against corrosion for a long time. |
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| Keywords: | A Mg A Organic coatings B EIS C Anodic films |
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