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| Micro–arc Oxidation and Sol–Gel Composite Coatings on Magnesium Alloy |
| SHANG Wei1,2, CHEN Baizhen1, SHI Xichang1, WEN Yuqing2 |
1.College of Metallurgical Science and Engineering, Central South University, Changsha 410083
2.College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004 |
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Cite this article:
SHANG Wei CHEN Baizhen SHI Xichang WEN Yuqing. Micro–arc Oxidation and Sol–Gel Composite Coatings on Magnesium Alloy. Chin J Mater Res, 2011, 25(1): 57-60.
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Abstract Protective composite coatings were obtained on a magnesium alloy by micro–arc oxidation (MAO) and sol–gel technique. The cross–section morphologies and composition of the MAO coating and composite coatings were analyzed by scanning electron microscopy (SEM) and energy dispersive X–rays (EDX). The phase structure of the composite coatings was analyzed by X–ray diffractometer (XRD). The corrosion resistance of MAO coating and composite coatings in a 3.5% (mass fraction) NaCl solution was evaluated by potentiodynamic polarisation measures. The results show that SiO2–ZrO2 sol can effectively seal the micropores in the MAO coating, and the composite coatings are more compact and have good adhesion. The composite coatings are composed of MgO, MgAl2O4, SiO2 and ZrO2. The corrosion resistance of the sample with composite coatings is enhanced significantly.
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Received: 28 June 2010
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| Fund: Supported by National Key Technology R & D Program of China No.2006BAB09B04, and the Project of Guangxi Education Department No.200911MS110. |
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