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《Materials for Mechanical Engineering》 2013-05
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Effects of pH of Electrolyte on Ceramic Micro-arc Oxidation Coating on Titanium Alloy

CHEN Yin1,MA Feng-cang2,LIU Ping2,LI Wei2,LIU Xin-kuan2,CHEN Xiao-hong2,HE Dai-hua2(1.School of Mechanical Engineering;2.School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)  
A titanium dioxide ceramic film was prepared on titanium alloy surface by micro-arc oxidation(MAO) in electrolyte of different pH.The surface morphology and film composition were studied by scanning electron microscopy and X ray diffractometer,and the relation among of electrolyte pH and current density,surface morphology of film and atom fraction of Ca and P were studied.The way of Ca,P elements getting into film being changed by electrolyte pH was also studied.The results show that a porous ceramic film containing calcium and phosphate was acquired.The current density first increased and then decreased with the increase of the oxidation time,and it increased with the increase of the electrolyte pH at the same time.The atom fraction of calcium in the film increased as the electrolyte pH increasing,however the atom fraction of phosphate decreased first and then increased.Calcium was mainly through high temperature sintering during micro-arc oxidation process into the film,but the phosphate element was through the static electricity and high temperature sintering working together.
【Fund】: 上海市自然科学基金资助项目(09ZR1422100);; 上海市教育委员会重点学科建设项目资助(J50503);; 上海市教委科研创新一般项目(10YZ94)
【CateGory Index】: TG174.4
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