首页> 外文期刊>International Journal of Electrochemical Science >Correlation between Electric Parameters and Microstructural Properties of LZ91 Mg Alloy Coated by Micro Arc Oxidation
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Correlation between Electric Parameters and Microstructural Properties of LZ91 Mg Alloy Coated by Micro Arc Oxidation

机译:微弧氧化包覆LZ91 Mg合金电学参数与组织性能的相关性

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Micro arc oxidation (MAO) coatings are prepared on LZ91 Mg alloy at different voltages (400, 450and 500 V). A DC, uni-polar and bi-polar power mode is used, respectively, in this work. The aim ofthis study is to investigate the effect of electrical parameters (power mode and voltage) on themorphology, microstructure and the corrosion behavior for LZ91 alloy. The element distribution,morphology, and corrosion resistance were studied by Electron Probe X-ray Micro-analyzer, ScanningElectron Microscope, potentiodynamic polarization in 3.5 wt.% NaCl solution and salt spray test. It isfound that the increase of voltage make the coatings more porous and thicker. The applied power mode(DC, uni-polar and bi-polar modes) shows a significant influence on the coating morphology andcorrosion resistance. Analysis of SST and potentiodynamic polarization technique on the samplesshow that the corrosion resistance of the MAO coated samples is much better than that of the bareLZ91 Mg alloy. The MAO coating prepared at 450 V under bi-polar power has smallest porosity, andhence yields best corrosion resistance on LZ91 Mg alloy.
机译:在LZ91 Mg合金上以不同的电压(400、450和500 V)制备微弧氧化(MAO)涂层。在这项工作中,分别使用直流,单极和双极功率模式。这项研究的目的是研究电参数(功率模式和电压)对LZ91合金的形貌,微观结构和腐蚀行为的影响。用电子探针X射线显微分析仪,ScanningElectron显微镜,3.5%(重量)NaCl溶液中的电动力极化和盐雾试验研究了元素的分布,形貌和耐蚀性。发现电压的增加使涂层更多孔和更厚。施加的功率模式(直流,单极和双极模式)对涂层的形貌和耐蚀性有显着影响。对样品的SST分析和电位动力学极化技术分析表明,MAO涂层样品的耐蚀性比裸LZ91 Mg合金好得多。在双极性电源下以450 V电压制备的MAO涂层具有最小的孔隙率,因此对LZ91 Mg合金具有最佳的耐腐蚀性。

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