镁牺牲阳极法制备羟基磷灰石涂层的电化学性能

Electrochemical Characteristics of the Hydroxyapatite Coatings Prepared by Mg Sacrificial Anode

摘要:

羟基磷灰石(HA)作为一种最重要的生物材料被成功采用镁牺牲阳极法在Ti6Al4V合金表面合成，以提高该复合材料的电化学抗腐蚀性能。使用电子能谱(EDX)、电子探针(EPMA)、傅里叶红外变换图谱(FTIR)和X射线衍射(XRD)对HA涂层进行分析。结果表明，涂层主要由针状羟基磷灰石晶体组成，Ca/P比为1.4063。浸泡30 d后，HA涂层在汉克氏溶液中晶体变大，在林格氏溶液和台氏溶液中针状晶体分别转变为片状和柱状。通过测试在3 种模拟体液和人血中的开路电位、极化曲线和交流阻抗图谱表明，有HA涂层的Ti6Al4V合金比未涂层的Ti6Al4V合金具有更好的电化学性能

Abstract:

The hydroxyapatite (HA) coating, one of the most important biomaterials, was prepared on Ti6Al4V alloy by Mg sacrificial anode to improve the anticorrosion electrochemical characteristics. Energy dispersive X-ray analysis (EDX), electron probe microanalyzer (EPMA), Fourier transform infrared spectra (FTIR) and X-ray diffraction (XRD) were used to analyze the HA coating. The results show that the HA coating is composed of needle-like hydroxyapatite crystals with the Ca/P ratio of 1.4063. After the immersion test of 30 d, the crystals become larger in Hank’s solution, from needle-like to sheet-like in Ringer’s solution and column-like in Tyrode’s solution. The tests of open circuit potential, polarizing curves and EIS method in Hank’s solution, Ringer’s solution, Tyrode’s solution and human blood show that the Ti6Al4V alloy with HA coating has better electrochemical characters than Ti6Al4V alloy