Corrosion Resistance of the Superhydrophobic MgOH2-Mg-Al Layered Double Hydroxide Coatings on Magnesium AlloysReport as inadecuate




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1

College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China

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State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China

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Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China





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Authors to whom correspondence should be addressed.



Academic Editors: Vineet V. Joshi and Alan Meier

Abstract Coatings of the MgOH2-Mg-Al layered double hydroxide LDH composite were formed by a combined co-precipitation method and hydrothermal process on the AZ31 alloy substrate in alkaline condition. Subsequently, a superhydrophobic surface was successfully constructed to modify the composite coatings on the AZ31 alloy substrate using stearic acid. The characteristics of the composite coatings were investigated by means of X-ray diffractometer XRD, Fourier transform infrared spectroscopy FTIR, X-ray photoelectron spectroscopy XPS, scanning electronic microscope SEM and contact angle CA. The corrosion resistance of the coatings was assessed by potentiodynamic polarization, the electrochemical impedance spectrum EIS, the test of hydrogen evolution and the immersion test. The results showed that the superhydrophobic coatings considerably improved the corrosion resistant performance of the LDH coatings on the AZ31 alloy substrate. View Full-Text

Keywords: magnesium alloy; layered double hydroxide; MgOH2; superhydrophobicity; corrosion resistance magnesium alloy; layered double hydroxide; MgOH2; superhydrophobicity; corrosion resistance





Author: Fen Zhang 1,2, Changlei Zhang 1,2, Rongchang Zeng 1,2,* , Liang Song 3, Lian Guo 1,2 and Xiaowen Huang 1,*

Source: http://mdpi.com/



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