Electrochemical Deposition and Characterization of Layered Double Hydroxide Film on Magnesium Alloys

doi:10.11902/1005.4537.2019.178

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (5): 453-457 DOI: 10.11902/1005.4537.2019.178

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Electrochemical Deposition and Characterization of Layered Double Hydroxide Film on Magnesium Alloys

OUYANG Yuejun¹,HU Ting²,WANG Jiayin²,XIE Zhihui²(

)

1. College of Chemistry and Materials Engineering, Huaihua University, Huaihua 418000, China
2. Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, China West Normal University, Nanchong 637002, China

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Abstract

MgAl-layered double hydroxide (MgAl-LDH) coatings were prepared on AZ31 magnesium alloy by electrochemical deposition. The surface morphology and corrosion resistance of the coatings were characterized by X-ray diffraction (XRD), Fourier infrared spectrometer (FT-IR), scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS) and Tafel polarization curves. The results show that the coating prepared with the optimal processing parameters has good corrosion resistance in 3.5%(mass fraction) NaCl solution and can effectively protect the magnesium alloy from corrosion. In comparison to those of the bare My-alloy substrate, the impedance modulus of the coating is increased by two orders of magnitude , the free-corrosion potential is increased by 0.96 V, and the corrosion current density is reduced by three orders of magnitude. These findings demonstrate that the MgAl-LDH coatings with good corrosion resistance can be obtained by a simple electrochemical deposition method.

Key words: magnesium alloy electrochemical deposition layered double hydroxide corrosion

Received: 30 September 2019

ZTFLH:

TQ153

Fund: Young Elite Scientists Sponsorship Program by CAST(2018QNRC001);National Natural Science Foundation of China (51501157) and Sichuan Science and Technology Program(2018JY0483)

Corresponding Authors: Zhihui XIE E-mail: zhxie@cwnu.edu.cn

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Cite this article:

OUYANG Yuejun,HU Ting,WANG Jiayin,XIE Zhihui. Electrochemical Deposition and Characterization of Layered Double Hydroxide Film on Magnesium Alloys. Journal of Chinese Society for Corrosion and protection, 2019, 39(5): 453-457.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.178 OR https://www.jcscp.org/EN/Y2019/V39/I5/453

Fig.1 Surface micrographs of LDH coatings electrodeposited on AZ31 magnesium alloy at the different voltages of -1.5 V (a, b), -1.7 V (c, d) and -2.0 V (e, f)

Fig.2 XRD patterns of AZ31 magnesium alloy after electro-deposition of LDH at different voltages

Fig.3 FT-IR spectra of AZ31 magnesium alloy after electr-odeposition of LDH at different voltages

Fig.4 Bode magnitude (a) and Bode phase (b) plots of AZ31 magnesium alloy without and with LDH coatings electrodeposited at different voltages in 3.5%NaCl solution and equivalent circuits of AZ31 Mg alloy (c) and LDH coating (d) (the scatter points and solid lines are experimental and fitting results, respectively)

Fig.5 Tafel curves of AZ31 magnesium alloy and LDH coatings electrodeposited at different voltages in 3.5%NaCl solution

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