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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Voltage on Microstructure and Corrosion Resistance of Micro-arc Oxidation Ceramic Coatings Formed on KBM10 Magnesium Alloy
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Effects of Voltage on Microstructure and Corrosion Resistance of Micro-arc Oxidation Ceramic Coatings Formed on KBM10 Magnesium Alloy

机译：电压对KBM10镁合金微弧氧化陶瓷涂层微观结构和耐腐蚀性的影响

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摘要

Micro-arc oxidation (MAO) coatings on KBM10 magnesium alloy were prepared in an electrolyte system with sodium silicate, potassium hydroxide, sodium tungstate, and citric acid. The effects of voltage on the microstructure and corrosion resistance of MAO coatings were studied using stereoscopic microscopy, scanning electron microscopy, x-ray diffraction, scratch tests, potentiodynamic polarization, and electrochemical impedance spectroscopy. The results showed that the roughness of the MAO coatings, diameter, and number of pores increase with the increase in voltage. The coating formed at the voltage of 350 V exhibited the best adhesive strength when evaluated by the automatic scratch tester. The coatings were mainly composed of MgO, MgWO4, and Mg2SiO4, and the content of Mg2SiO4 increased with the increase in voltage. The corrosion resistance of MAO coatings could be improved by changing the applied voltage, and the best corrosion resistance of MAO coating was observed at the voltage of 350 V.
机译：在具有硅酸钠，氢氧化钾，钨酸钠和柠檬酸的电解质系统中制备KBM10镁合金上的微电弧氧化（MAO）涂层。使用立体显微镜，扫描电子显微镜，X射线衍射，刮擦试验，电位偏振和电化学阻抗光谱研究了电压对MAO涂层微观结构和耐腐蚀性的影响。结果表明，毛涂层，直径和孔数的粗糙度随着电压的增加而增加。当通过自动划痕测试仪评估时，在350V的电压下形成的涂层在通过自动划痕测试仪评估时表现出最佳粘合强度。涂层主要由MgO，MgWO 4和Mg2SiO 4组成，Mg2SiO4的含量随电压的增加而增加。通过改变施加的电压可以提高MAO涂层的耐腐蚀性，并且在350V的电压下观察到MAO涂层的最佳耐腐蚀性。

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