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    ZHOU Qi, MA Ai-bin, JIANG Jing-hua, SONG Dan, YANG Dong-hui, CHEN Jian-qing. Optimization of MAO Process of Ultra-fine Grained AZ91D Mg Alloy[J]. Corrosion & Protection, 2013, 34(9): 825-830.
    Citation: ZHOU Qi, MA Ai-bin, JIANG Jing-hua, SONG Dan, YANG Dong-hui, CHEN Jian-qing. Optimization of MAO Process of Ultra-fine Grained AZ91D Mg Alloy[J]. Corrosion & Protection, 2013, 34(9): 825-830.
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    Optimization of MAO Process of Ultra-fine Grained AZ91D Mg Alloy

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    • Received Date: October 10, 2012
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      • Abstract
    • The micro-arc oxidation (MAO) coatings were successfully formed on a bulk ultra-fine grained (UFG) AZ91D alloy in a silicate electrolyte, and then the MAO process parameters were optimized via an orthogonal test to improve the surface protection of the UFG Mg substrate. The optimum MAO parameters are 400 V of maximum peak forward voltage, -15 V of peak negative anode voltage, 600 Hz of operating frequency, 30% of duty cycle ratio and 20 min of oxidation time. The MAO coating formed under the above conditions had a lower porosity (8.3%), greater even thickness (19.23 μm), higher pitting potential (-0.199 V), larger Rt value (7 765 kΩ·cm2) and longer proctection time (1.29 times).
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      • References (19)
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