活性电解液中外加电压对纯钛微弧氧化陶瓷层蚀孔孔径及结合力的影响

Effects of Applied Voltage on the Pore Diameter of Pitting Corrosion and Adhesion Strength of Titanium MAO Ceramic Coating in the Active Ion Electrolyte Solution

在活性电解液中采用微弧氧化技术制备TiO_(2)陶瓷层,研究外加电压对纯钛微弧氧化陶瓷层蚀孔孔径及结合力的影响规律,采用扫描电镜对陶瓷层表面蚀孔孔径进行表征,采用划痕法检测陶瓷层与基底的结合力。结果表明:陶瓷层表面蚀孔孔径在50μm以上,且孔径随外加电压的增加而增大;外加电压对陶瓷层与基体结合力影响较小,但当电压达到450 V时膜层遭到破坏。XRD和EDS检测表明制备得到的陶瓷膜的主要成分是锐钛矿TiO_(2),还含有少量Ca和P元素。

The TiO_(2)ceramic coating is prepared in the reactive ion electrolyte solution by microarc-arc oxidation(MAO).The effects of applied voltage on the pore diameter of pitting corrosion and adhesion strength of titanium MAO ceramic coating are studied.The SEM is employed to characterize the pore diameter of pitting corrosion of ceramic coating surface and the adhesion strength between the ceramic coating and the matrix is measured by the scratch test.The results show that the pore diameter of pitting corrosion is more than 50μm and increases with the increasing of applied voltage.The effect of applied voltage on the adhesion strength is less,but the coating is damaged when the voltage reaches 450 V.The ceramic coating is mainly composed of anatase TiO_(2)and a small amount of Ca and P determined by XRD and EDS.