关键词：
微弧氧化;微孔参数;多孔涂层;扫描电镜;图像处理
摘 要：
在含钙磷的硅酸盐电解液体系中,采用微弧氧化技术在纯钛表面制备多孔涂层,分析不同氧化时间(3,6,9,12,15 min)对涂层孔径大小、孔隙率等微孔参数的影响.通过扫描电镜(SEM)获取涂层表面形貌的原始图像,采用MATLAB图像处理技术实现涂层微孔参数的自动分析与定量表征.结果表明:处理后图像中的大小微孔可以被清晰识别;当氧化时间为3 min时,孔径小于1μm的微孔数量最多,大约占总数的4/5,涂层表面孔隙率为10.5%;随着时间的延长,微孔总数明显减少,孔径大于4μm的微孔持续增加,涂层孔隙率不断增大;当处理时间延长到15 min时,出现8μm及以上的大孔,表面孔隙率增长至15.0%左右.
译 名：
Effects of oxidation time on micro-pore parameters of micro-arc oxidation coatings on pure titanium
作 者：
WU Cong;LI Boquan;XU Lin;LIU Chuncheng;ZHANG Kun;School of Mechanical Engineering,Jiangsu University;
单 位：
WU Cong%LI Boquan%XU Lin%LIU Chuncheng%ZHANG Kun%School of Mechanical Engineering,Jiangsu University
关键词：
micro-arc oxidation;;micro-pore parameter;;porous coating;;SEM;;image processing
摘 要：
The porous coatings on pure titanium were prepared by micro-arc oxidation in silicatecontaining electrolyte with calcium phosphate. The size of micro-pores on the surface and the surface porosity of coatings for different oxidation times of 3,6,9,12 and 15 min were analyzed. The original images of surface morphologies of the coatings were obtained by scanning electron microscopy(SEM),and the micro-pore parameters of coatings were analyzed automatically and characterized quantitatively by MATLAB image processing technology. The results show that the size of micro-pores in the processed image can be clearly identified. After treated for 3 min,the percentage of micro-pores with the size less than 1 μm is approximate 80%,and the surface porosity of the coatings is 10. 5%. With the increasing of treatment time,the total number of micro-pores is decreased greatly,while the number of micro-pores with the size more than 4 μm is increased. The surface porosity of the coatings skyrockets constantly.When the treatment time is extended to 15 min,there are some large pores with the size of 8 μm and more than 8 μm,and the surface porosity is increased to about 15. 0%.
