Comparative Study on Corrosion Resistance of Micro Arc Oxidation Ceramic Coatings on Mg-Mn-RE Alloy

doi:10.11901/1005.3093.2015.410

Chinese Journal of Materials Research

2016, Vol. 30

Issue (3): 235-240 DOI: 10.11901/1005.3093.2015.410

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Comparative Study on Corrosion Resistance of Micro Arc Oxidation Ceramic Coatings on Mg-Mn-RE Alloy

LI Yuhai^*(

), ZHANG Baibing, DONG Xuguang, WANG Shuai

( School of Materials and Science Engineering, Shenyang University and Technology, Shenyang 110159, China)

Cite this article:

LI Yuhai, ZHANG Baibing, DONG Xuguang, WANG Shuai. Comparative Study on Corrosion Resistance of Micro Arc Oxidation Ceramic Coatings on Mg-Mn-RE Alloy. Chinese Journal of Materials Research, 2016, 30(3): 235-240.

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Abstract

A series of micro-arc oxidation (MAO) films were prepared on Mg-Mn-RE alloy by an alternating current with symmetric voltage in different alkaline solutions containing aluminate, phosphate or silicate and then the MAO films were characterized by SEM and XRD. The corrosion resistance of MAO films was evaluated by EIS potentiodynamic polarization. The results indicated that the MAO films prepared in phosphate or silicate systems have low thickness with obvious cracks, leading to poor corrosion resistance. In the contrast, the MAO films prepared in aluminate system exhibit the better corrosion resistance due to the compactness and higher surface quality, which shows a good prospect for the application.

Key words: metal materials Mg-Mn-RE magnesium alloy micro-arc oxidation (MAO) corrosion resistance

Received: 17 July 2015

ZTFLH:

TG146.2

About author: *To whom correspondence should be addressed, Tel: (024)24680809, E-mail: l-y-hai@163.com

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	Yuhai LI
	Baibing ZHANG
	Xuguang DONG
	Shuai WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.410 OR https://www.cjmr.org/EN/Y2016/V30/I3/235

Fig.1 Polarization curves of ceramic coatings obtained by MAO in different electrolyte systems and magnesium alloy substrate (a) NaAlO₂system; (b) Na₃PO₄ system; (c) Na₂SiO₃ system

Fig.2 Surface morphologies of ceramic coatings prepared by MAO in different electrolyte systems. (a) NaAlO₂system; (b) Na₃PO₄ system; (c) Na₂SiO₃ system

Fig.3 The section morphologies of ceramic coatings prepared by MAO in different electrolyte systems. (a) NaAlO₂system; (b) Na₃PO₄ system; (c) Na₂SiO₃ system

Fig.4 XRD spectra of ceramic coatings prepared by MAO in different electrolyte systems. (a) NaAlO₂system; (b) Na₃PO₄ system; (c) Na₂SiO₃ system

Fig.5 Polarization curves of magnesium alloy substrate and ceramic coatings prepared by MAO in different electrolyte systems

Table 1 Fitted data of Tafel polarization cuves

Fig.6 EIS impedance patterns of magnesium alloy substrate and three ceramic coatings

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