Effect of Ce on Corrosion Resistance of Films of ZnAlCe-layered Double Hydroxides on Mg-alloy

doi:10.11902/1005.4537.2020.068

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (3): 335-340 DOI: 10.11902/1005.4537.2020.068

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Effect of Ce on Corrosion Resistance of Films of ZnAlCe-layered Double Hydroxides on Mg-alloy

WANG Xiaoge¹^,², GAO Kewei¹, YAN Luchun¹, YANG Huisheng¹(

), PANG Xiaolu¹

^1.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
^2.Shanxi Engineering Vocational College, Department of Metallurgy and Environmental Engineering, Taiyuan 030009, China

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Abstract

Thin films of layered double hydroxides (LDHs) such as ZnAl-LDHs and ZnAlCe-LDHs were grown in situ on the surface of AZ91D Mg-alloy via one-step hydrothermal method. The influence of Ce on the morphology, chemical composition and corrosion resistance of ZnAlCe-LDHs films on Mg-alloy was studied by means of X-ray diffractometer (XRD), scanning electron microscope (SEM), EDS and EIS. The results showed that Ce ion had little effect on the network-like morphology of LDHs nests, but increased the thickness of the films and the size of the nanosheets. In comparison with ZnAl-LDHs films, the free-corrosion potential of ZnAlCe-LDHs films shifted positively up to 0.05 V and the corrosion current density was decreased by 1~2 orders. In the impedance diagram, the arc radius was increased obviously, indicating that the addition of Ce ion can enhance the corrosion resistance of ZnAl-LDHs films on AZ91D Mg-alloy.

Key words: Ce Mg-alloy ZnAlCe-LDHs corrosion resistance mechanism

Received: 20 April 2020

ZTFLH:

TG174

Fund: National Key R&D Program of China(2017YFB0702100);National Natural Science Foundation of China(51771026);Key Project of Shanxi Engineering Vocational College(yzd-201802)

Corresponding Authors: YANG Huisheng E-mail: 13910651209@163.com

About author: YANG Huisheng, E-mail: 13910651209@163.com

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Cite this article:

WANG Xiaoge, GAO Kewei, YAN Luchun, YANG Huisheng, PANG Xiaolu. Effect of Ce on Corrosion Resistance of Films of ZnAlCe-layered Double Hydroxides on Mg-alloy. Journal of Chinese Society for Corrosion and protection, 2021, 41(3): 335-340.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.068 OR https://www.jcscp.org/EN/Y2021/V41/I3/335

Fig.1 XRD patterns of AZ91D samples without and with ZnAl-LDHs and ZnAlCe-LDHs films

Fig.2 SEM surface morphologies (a, c, e) and EDS analysis results (b, d, f) of AZ91D samples without (a, b), with ZnAl-LDHs (c, d) and with ZnAlCe-LDHs (e, f) films

Fig.3 EDS mappings of main elements on AZ91D with ZnAlCe-LDHs film: (a) ZnAlCe-LDHs film, (b) C, (c) O, (d) Mg, (e) Al, (f) Zn, (g) Ce

Fig.4 Cross-sectional images of ZnAl-LDHs (a) and ZnAlCe-LDHs (b) films on AZ91D, and line scannings (d) of main elements along the denoted direction (c) on the cross section of ZnAlCe-LDHs film

Fig.5 Polarization curves of AZ91D samples without and with two thin films in 3.5%NaCl solution

Table 1 Fitting results of polarization curves

Fig.6 Nyquist (a) and Bode (b) plots of AZ91D samples without and with thin films in 3.5%NaCl solution

Fig.7 Equivalent circuit diagrams corresponding to EIS of AZ91D samples without (a) and with (b) ZnAl-LDHs and ZnAlCe-LDHs films in 3.5%NaCl solution

Table 2 Electrochemical parameters obtained by fitting equivalent circuit diagrams

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