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

Metals

Fen Zhang¹  Lian Guo¹  Rongchang Zeng¹  Changlei Zhang¹  Xiaowen Huang¹  Liang Song² 

[1] College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China;

关键词: magnesium alloy;    layered double hydroxide;    Mg(OH)2;    superhydrophobicity;    corrosion resistance;   

DOI  :  10.3390/met6040085

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown