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Metals 2016, 6(4), 85; doi:10.3390/met6040085

Corrosion Resistance of the Superhydrophobic Mg(OH)2/Mg-Al Layered Double Hydroxide Coatings on Magnesium Alloys

1
College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2
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
3
Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Vineet V. Joshi and Alan Meier
Received: 18 January 2016 / Revised: 18 March 2016 / Accepted: 6 April 2016 / Published: 13 April 2016
(This article belongs to the Special Issue Oxidation of Metals)
View Full-Text   |   Download PDF [5719 KB, uploaded 13 April 2016]   |  

Abstract

Coatings of the Mg(OH)2/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; Mg(OH)2; superhydrophobicity; corrosion resistance magnesium alloy; layered double hydroxide; Mg(OH)2; superhydrophobicity; corrosion resistance
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, F.; Zhang, C.; Zeng, R.; Song, L.; Guo, L.; Huang, X. Corrosion Resistance of the Superhydrophobic Mg(OH)2/Mg-Al Layered Double Hydroxide Coatings on Magnesium Alloys. Metals 2016, 6, 85.

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