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Effect of Forward Voltage on Coating Performance of TC4 Alloy with Micro-arc Oxidation

WU Yunfeng;YANG Gang;PEI Chong;FANG Shuming;Kunming Metallurgy Research Institute;  
Ceramic coating was fabricated on the surface of Ti6Al4 V alloy by micro-arc oxidation(MAO) method in Ca(CH3COO)2·H2O-NaH2PO4-EDTA solution, and was tested using the film thickness gauge and roughness gauge. The surface morphology, chemical composition, phase composition of micro-arc oxidation film layer were analyzed by SEM, EDS and XRD. The results show that, with the increase of forward voltage, the thickness and roughness of coating increase, the diameters of holes on surface of the ceramic coating increase, but the numbers of holes decrease. With the increase of forward voltage, the content of P, Ca elements increases, unstable anatase TiO2 gradually changes to stable rutile TiO2.
【Fund】: 医用钛合金材料关键技术研发(2012ZE008)
【CateGory Index】: TG174.4
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