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《Surface Technology》 2007-06
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Study on Electrolyte for MAO and Corrosion Resistance of Magnesium Alloy

GAO Feng,LI Peng-fei,GUO Feng,ZHANG Yan,NIU Shi-yue(School of Materials Science and Engineering,IMUT,Huhhot 010051,China)  
Micro-arc oxidation of AZ31D magnesium alloy was studied in the phosphate system electrolyte at a constantly applied permanent voltage.To optimize the formulation of phosphate system electrolyte,taking homogeneous of ceramic coating and 48 hours'rate of corrosion combining with its apparent quantity as target,the orthogonal experiment was used in the research.The obtained feasible is as follows: 15.0g/L Na5P3O10,2.0g/L NaOH,1.0g/L NaWO4,2.0g/L Na2EDTA.The phase compose was analyzed by X-ray diffraction(XRD),and the corrosion resistance of ceramic coating was measured by soak test in NaCl solution and neutral salt spray test.It is found that the coating is mainly composed of Mg,MgO and Mg2P2O7,and has certain corrosion resisting property.
【Fund】: 内蒙古工业大学重点研究项目(ZD200510)
【CateGory Index】: TG174.451
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