电解液钙磷比对微弧氧化法制备含钙磷氧化物膜结构的影响

Effects of different concentration of calcium and phosphor in electrolytic solution on the properties of containing calcium and phosphor oxide film formed by micro arc oxidation

目的:探讨在不同钙磷比的电解液中,利用微弧氧化技术在纯钛表面形成含钙磷氧化物膜的组成。方法:根据电解液中钙磷浓度比的不同,将纯钛试件分成A、B、C和D共4组,采用微弧氧化技术对各个试件作处理,使用扫描电镜(SEM)观察试件的表面形貌和X射线能谱仪(EDS)对试件的表面氧化层进行成分分析。结果:微弧氧化处理后,纯钛表面生成微孔结构的氧化膜,表面沉积物的元素组成主要是Ti、O、Ca、P等。经相关系数分析,电解液的钙磷浓度比与氧化膜的Ca、P含量相关,有统计学意义(P<0.05)。随电解液中Ca浓度的增加,表现为Ca和P元素的上升。除A组Ca/P比为1.26外,其它3组Ca/P比均在1.42～1.44之间。结论:利用微弧氧化技术能形成含钙磷的多孔氧化物薄膜,氧化物薄膜中钙磷含量与电解液中钙磷含量有关。

Objective： To discuss the ability to form oxide layer containing phosphor and calcium in titanium surface by micro arc oxidation （MAO） in electrolytic solutions containing different phosphor and calcium concentration. Methods：Titanium samples were divided into A, B, C and D groups according to different concentration of phosphor and calcium in electrolytic solutions. After MAO, the morphology of the oxide coating was monitored with scanning electron microscopy （ SEM ） , and the composition of titanium surface was analyzed by X-ray energy dispersive spectrometer （EDS）. Results：The coating was porous and uneven where each pore size was no more than 5 μm, and the elemental compositions of titanium surface were mainly Ti, O, Ca and P. Between the concentration of electrolytic solutions and the contents of Ca or P in the coating, there was statistically significant according to the analysis of correlation coefficient （ P 〈 0.05 ）. The contents of Ca and P in the coating increased according to the concentration of Ca in the electrolytic solutions. The ratio of Ca and P in group A was 1.26, while the data were from 1.42 to 1.44 in the other three groups. Conclusion：The oxide layer containing Ca and P can be formed by MAO and the contents of Ca and P in the layer are related with Ca and P concentration in the electrolytic solutions.