Research and Application of Micro-Arc Oxidation Technology on Magnesium Alloy Motorcycle Key Parts

Abstract:

The micro-arc oxidation process parameters of AZ91D Mg alloy and Na₂WO₄ concentration were optimized by orthogonal experiment. SEM, EDX, XRD, potentiodynmic polarization and immersion corrosion test were carried out to investigate the morphologies, phase composition and corrosion resistance of the MAO coatings. The results shown that the MAO coating are mainly composed of MgOMg₂SiO₄MgAl₂O₄,MgWO₄ and a small amount of amorphous material as well as with a double layer structure, outer loose and inner denser, the proper parameters and additive concentration were: 300Hz,5.0A/dm²,50%/50% and 2.0g/l Na₂WO₄. The MAO coatings coated under the proper condition on AZ91D Mg alloy motorcycle parts provided the far batter corrosion resistance than the substrate, suggesting that MAO coatings can effectively protect the motorcycle parts against the erosion from corrosion medium. Meanwhile, it also found that the irregular part shape has some influence on the coatings formation as well as corrosion resistance.

• Periodical: Applied Mechanics and Materials (Volumes 496-500)
• Pages: 63-70
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.496-500.63
• Online since: January 2014
• Authors: Xi Di Chen, Qi Zhou Cai, Zhi Wei Deng, Li Song Yin
• Keywords: AZ91D Mg Alloy, Corrosion Resistance, Micro-Arc Oxidation, Motorcycle

References

[1] ZENG Rongchang，KE Wei X U Yongbo etal,. Acta metallurgical sinica. 2001, 37(7): 673-685.

[2] S. Ji, Z. Fan, M.J. Bevis, Materials Science and Engineering, 2001, A299, 210.

[3] Zhi Qing, Gao Jin etal. Acta metallurgical sinica，2008，44（8）：986-990.

[4] XUE Wen bin , LAI Yong chun , DEN G Zhi wei, etal . Material Science &Technology , 1997 , 5 (2) : 89292-89233.

[5] ZHANG Zhan ling, CHEN Shang Kun, etal. Materials Protection [J], 2010, 1(43): 48-51.

[6] Yan. Li, Zhu. Lu. Materials Protection, 2000, 33 (11): 29-31.

[7] Hongye. Zheng, YongKang Wang, et al., Materials Letters 59 (2005) 139–142.

[8] Bailing Jiang, Renbing Zhao, Ge Liang, et al., Materials Review. 9(2006) 154-157.

[9] XUE Wen2bin , LAI Yong2chun , DEN G Zhi2wei , et al . The properties of coating formed by microplasma oxidation on magnesium alloy [J]. Material Science & Technology, 1997, 5 (2): 89292.

[10] Shang Wei1, Chen Baizhen, etal. Effects of Electrolyte Additives on the Performance of Micro-Arc Oxide Films on AZ91D Magnesium Alloy RARE METAL MATERIALS AND ENGINEERING 2009, 38(2): 335-338.

[11] Jing Xia. Corrosion and Protection of AZ40 Magnesium Alloy in NaCl Solution[M]. Chongqing University. (2012).