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Formation process of composite plasma electrolytic oxidation coating containing zirconium oxides on AM50 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2011年第4期21卷 943-948页

作者：刘锋单大勇宋影伟韩恩厚中国科学院金属研究所金属腐蚀与防护国家重点实验室沈阳110016

The formation processes of a composite ceramic coating on AM50 magnesium alloy prepared by plasma electrolytic oxidation （PEO） in a K 2 ZrF 6 electrolyte solution were studied by scanning electron microscope （SEM） and energy dispersive X-ray spectroscope （EDX）. Electrochemical impedance spectroscopy （EIS） tests were used to study the variation of the corrosion resistance of the coating during the PEO treatment. The results show that the coating formed on Mg alloy is mainly composed of MgO and MgF 2 when the applied voltage is lower than the sparking voltage, and zirconium oxides start to be deposited on Mg substrate after the potential exceeding the sparking voltage. The corrosion resistance of the coating increases with increasing the applied voltage.

关键词： plasma electrolytic oxidation coating zirconium oxide MgO corrosion resistance

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Excellent plasma electrolytic oxidation coating on AZ61 magnesium alloy under ordinal discharge mode

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Journal of Magnesium and Alloys 2022年第9期10卷 2460-2474页

作者： Weiyi Zhang Yunhui Du Peng Zhang School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China

In the preparation of plasma electrolytic oxidation(PEO)coating,the rapid heating of freely-happened electron avalanche under traditional discharge(TD)mode inevitably results in a strong eruption of electric breakdown *** PEO coating is loose and invariably composed of a very thin inner dense layer and an outer loose layer,as a result of which its properties and application have been limited *** this work,for purpose of weakening the eruption of breakdown melt,thickening the inner dense layer,densifying the outer loose layer and improving the performance of PEO coating,ordinal discharge(OD)mode of PEO coating is developed by regulating the mass ratio of MgF_(2) to MgO(α)and voltage in the PEO investigation on AZ61 magnesium alloy in KF-KOH *** formation mechanism under different discharge mode,electrochemical corrosion and wear of PEO coatings are *** results show that the suitableαand voltage for effective OD are 1.3 and 130 V under which the freely-happened electron avalanche in MgF_(2) under TD mode can be restricted by the adequate adjacent *** with TD mode,the inner dense layer,in which the(10¯1)plane of MgF_(2) is parallel to the(111)plane of MgO at their well-knit semi-coherent interface,is thickened to 2.4∼7.2 times,the corrosion potential(E_(corr))improvement is enlarged to 3.6∼13.2 times and the corrosion current intensity(I_(corr))is reduced from 10.8∼9.499 to 0.433(10^(−6) A/cm^(2)).The outer loose layer is densified and the wear rate is lessened 65.5%∼89.8%by the evident melioration in surface porosity,impedance and *** work deepens the understanding about the discharge of PEO coating and provides an available OD mode for preparing excellent PEO coating.

关键词： Magnesium alloy plasma electrolytic oxidation coating Ordinal discharge Microstructure Performance

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