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Journal of Chinese Society for Corrosion and protection  2016, Vol. 36 Issue (2): 137-142    DOI: 10.11902/1005.4537.2015.061
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Negative Voltage on Structure and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Magnesium Alloy
Xuejun CUI(),Xiaofei LI,Te LI,Xiuzhou LIN
Material Corrosion and Protection Key Laboratory of Sichuan Province, College of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000, China
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Micro-arc oxidation (MAO) coatings were fabricated on AZ31B Mg-alloy in a Na2SiO3-NaOH-NaF aqueous solution by varying applied negative voltages with a bipolar asymmetric pulsing power. Then the effect of the applied negative voltage on the microstructure and corrosion resistance of MAO coatings were studied by SEM and polarization curves. The results show that a corrosion resistant coating can be obtained by an applied negative voltage 40 V for a duration 10~15 min. However, the surface morphology of the MAO coating exhibited obviously many micro-cracks when the applied negative voltage is above 60 V, resulting in a poor corrosion resistance. Therefore, the value of the negative voltage and the oxidation time should be carefully matched so that to prepare a MAO coating with appropriate compactness and corrosion resistance.

Key words:  magnesium alloy      micro-arc oxidation      negative voltage      corrosion resistance      compactness     

Cite this article: 

Xuejun CUI,Xiaofei LI,Te LI,Xiuzhou LIN. Negative Voltage on Structure and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Magnesium Alloy. Journal of Chinese Society for Corrosion and protection, 2016, 36(2): 137-142.

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Fig.1  Surface morphologies of MAO coatings at different negative voltages: (a) 0 V; (b) 20 V; (c) 40 V; (d) 60 V; (e) 80 V
Fig.2  Cross-sectional morphologies of MAO coatings at different negative voltages: (a) 0 V, 10 min; (b) 40 V, 10 min; (c) 40 V, 30 min
Fig.3  Polarization curves of MAO coatings prepared at different negative voltages in 3.5%NaCl solution
voltage / V
BlankAZ31B 42.4 125.9 1464 105.80 0.154
0 33.6 240.0 1523 3.40 3.200
20 320.8 136.2 1400 3.03 13.700
40 271.9 157.2 1386 0.49 88.400
60 223.5 214.8 1413 4.71 10.100
Table 1  Fitting results of the polarization curves from Fig.3
Fig.4  Polarization curves of MAO coatings prepared at 40 V negative voltage for different time in 3.5%NaCl solution
10 381.4 111.1 1381 0.27 136.2
15 396.7 111.7 1389 0.07 557.2
30 366.9 111.2 1427 1.45 25.6
Table 2  Fitting results of the polarization curves from Fig.4
Fig.5  Effect of negative voltage on thickness of MAO coating formed after treatment for 10 min
Fig.6  Effect of oxidation time on thickness of MAO coating formed during treatment at -40 V
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