Effect of Electrical Parameters on Micromorphology and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Mg Alloy

doi:10.11902/1005.4537.2013.233

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (6): 495-501 DOI: 10.11902/1005.4537.2013.233

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Effect of Electrical Parameters on Micromorphology and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Mg Alloy

CUI Xuejun^1,²(

), WANG Rong², WEI Jinsong², BAI Chengbo², LIN Xiuzhou^1,²

1. Material Corrosion and Protection Key Laboratory of Sichuan Province, Sichuan University of Science and Engineering, Zigong 643000, China
2. College of Materials and Chemical Engineering, Sichuan University of Science and Engineering, Zigong 643000, China

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Abstract

A micro-arc oxidation coating containing uniformly distributed fine pores was obtained on AZ31B Mg alloy in a glycerol containing silicate aqueous solution. The effect of electrical parameters, such as voltage, frequency and duty cycle on the micromorphology, corrosion resistance and thickness of the micro-arc oxidation (MAO) coating was investigated by means of scanning electron microscope (SEM), electrochemical workstation and thickness gauge. The results show that the size of micro-pores and the thickness of MAO coating increase accordingly with the increasing voltage, while the corrosion resistance first increases and then decreases. However, the diameter of micros-pores decreases with the increasing frequency while corrosion resistance increases; the frequency has a weak effect on the thickness of the coating; when the duty cycle is larger than 45%, the size of micro-pores and thickness are apt to increase while the corrosion resistance decreases due to the breakdown and damage of MAO coating. The optimal electrical parameters for obtaining an excellent MAO coating are voltage 230~260 V, frequency 300~500 Hz and duty cycle 30%~45%.

Key words: magnesium alloy micro-arc oxidation electrical parameter corrosion resistance

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Cite this article:

CUI Xuejun, WANG Rong, WEI Jinsong, BAI Chengbo, LIN Xiuzhou. Effect of Electrical Parameters on Micromorphology and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Mg Alloy. Journal of Chinese Society for Corrosion and protection, 2014, 34(6): 495-501.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.233 OR https://www.jcscp.org/EN/Y2014/V34/I6/495

Fig.1 Surface micromorphologies of MAO coatings obtained via varying voltage on AZ31B Mg alloy: (a) 200 V, (b) 230 V, (c) 260 V, (d) 290 V, (e) 320 V

Fig.2 Change of thickness of MAO coatings as a function of voltage

Fig.3 Polarization curves of MAO coatings obtained via varying voltage on AZ31B Mg alloy in 3.5%NaCl solution

Fig.4 Surface micromorphologies of MAO coatings obtained via varying frequency on AZ31B Mg alloy: (a) 100 Hz, (b) 200 Hz, (c) 300 Hz, (d) 400 Hz, (e) 500 Hz

Fig.5 Change of thickness of MAO coatings as a function of frequency

Fig.6 Polarization curves of MAO coatings formed on AZ31B Mg alloy under different frequency in 3.5%NaCl solution

Fig.7 Surface micromorphologies of MAO coatings obtained via varying duty cycle on AZ31B Mg alloy: (a) 15%, (b) 30%, (c) 45%, (d) 60%, (e) 75%

Fig.8 Change of thickness of MAO coatings as a function of duty cycle

Fig.9 Polarization curves of MAO coatings obtained via varying duty cycle on AZ31B Mg alloy in 3.5%NaCl solution

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