Properties of Layered Dihydroxyl Metal (MgAlLa) Oxide Composite Coatings on Different Micro-arc Oxidation Surfaces of Mg-Gd-Y-Zn-Mn Alloy

doi:10.11902/1005.4537.2023.153

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (4): 693-703 DOI: 10.11902/1005.4537.2023.153

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Properties of Layered Dihydroxyl Metal (MgAlLa) Oxide Composite Coatings on Different Micro-arc Oxidation Surfaces of Mg-Gd-Y-Zn-Mn Alloy

WU Jiahao¹, WU Liang¹^,²^,³(

), YAO Wenhui¹^,²^,³, YUAN Yuan¹^,²^,³, XIE Zhihui⁴, WANG Jingfeng¹^,²^,³, PAN Fusheng¹^,²^,³

^1.National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
^2.National Key Laboratory of Advanced Casting Technologies, Chongqing University, Chongqing 400044, China
^3.State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China
^4.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

Micro-arc oxidation (MAO) surfaces were prepared on a Mg-Gd-Y-Zn-Mn alloy in four different electrolytes, namely aluminate/silicate (AS), aluminate/phosphate (AP), silicate/phosphate (SP) and aluminate/phosphate/silicate (APS), afterwards, on which films of layered dihydroxyl metal (MgAlLa) oxides (MgAlLa-LDHs) were in-situ grown to acquire the composite coating of MgAlLa-LDHs/MAOs. Then the effect of different MAO surfaces on the properties of the MgAlLa-LDHs/MAOs composite coatings were studied by means of field emission scanning electron microscopy (FE-SEM), X-ray diffractometer (XRD), energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS), as well as measurements of potentiodynamic polarization, electrochemical impedance and hydrogen evolution etc. in terms of their morphology, microstructure, composition and corrosion behavior in 3.5%NaCl solution. The results show that the different MAO coatings present differences in morphology, phase constituents, number of phases, element distribution and pore size, which affect the in-situ growth of the subsequent MgAlLa-LDHs nanosheets, so that the shape, size and crystallinity of the MgAlLa-LDHs nanosheets are obviously different. In addition, the composite coatings of MgAlLa-LDHs/APS-MAO show excellent corrosion resistance with a corrosion current density 9.14×10^-9 A·cm^-2, which is about four orders of magnitude lower than that of the bare Mg-alloy substrate.

Key words: micro-arc oxidation layered double hydroxyl metal oxide electrolyte Mg-alloy corrosion resistance

Received: 10 May 2023 32134.14.1005.4537.2023.153

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51971040);National Natural Science Foundation of China(52171101)

Corresponding Authors: WU Liang，E-mail: wuliang@cqu.edu.cn

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	WU Jiahao
	WU Liang
	YAO Wenhui
	YUAN Yuan
	XIE Zhihui
	WANG Jingfeng
	PAN Fusheng

Cite this article:

WU Jiahao, WU Liang, YAO Wenhui, YUAN Yuan, XIE Zhihui, WANG Jingfeng, PAN Fusheng. Properties of Layered Dihydroxyl Metal (MgAlLa) Oxide Composite Coatings on Different Micro-arc Oxidation Surfaces of Mg-Gd-Y-Zn-Mn Alloy. Journal of Chinese Society for Corrosion and protection, 2023, 43(4): 693-703.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2023.153 OR https://www.jcscp.org/EN/Y2023/V43/I4/693

Table 1 Specific compositions of different micro-arc oxidation electrolytes

Fig.1 Flow chart of composite coating preparation

Fig.2 XRD patterns of MAO coatings (a) and MAO/MgAlLa-LDHs composite coatings (b)

Fig.3 FT-IR spectra of MAO coatings (a) and MAO/MgAlLa-LDHs composite coatings (b)

Fig.4 SEM morphologies of MAO-AS (a1, a2), MAO-AP (b1, b2), MAO-SP (c1, c2), MAO-APS (d1, d2), MAO-AS-L (e1, e2), MAO-AP-L (f1, f2), MAO-SP-L (g1, g2) and MAO-APS-L (h1, h2) coatings

Table 2 EDS analysis results of MAO coatings and corresponding MAO/LDHs composite coatings

Fig.5 XPS spectra of MAO-AS-L (a, b), MAO-AP-L (c, d), MAO-PS-L (e, f) and MAO-APS-L (g, h) composite coatings

Fig.6 Potentiodynamic polarization curves of Mg alloy substrate, MAO coatings (a) and MAO/LDHs composite coatings (b) in 3.5%NaCl solution

Table 3 Fitting results of E_corr and I_corr of the potentiodynamic polarization curves in Fig.6

Fig.7 Impedance module (a, c) and phase angle (b, d) plots of MAO coatings (a, b) and MAO/LDHs composite coatings (c, d) in 3.5% NaCl solution

Fig.8 Equivalent circuits used for fitting EIS data: (a) MAO-SP, MAO-APS, (b) MAO-AP, MAO-AS, (c) all MAO/LDHs composite coatings

Table 4 Fitting results of EIS plots in Fig.7

Fig.9 Hydrogen evolution data of MAO coatings (a) and MAO/LDHs composite coatings (b) during immersion in 3.5% NaCl solution

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