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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。
Hydroxyapatite (HA), one of the most important biomaterials, was successfully synthesized on the surface of Ti6Al4V alloy by magnesium sacrificial anode method to improve the electrochemical corrosion resistance of the composite. The HA coating was analyzed using electron spectroscopy (EDX), electron probe (EPMA), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The results show that the coating mainly composed of acicular hydroxyapatite crystals, Ca / P ratio of 1.4063. After soaking for 30 d, the HA coating became larger in the Hank’s solution, and the acicular crystals changed into lamellar and columnar in the Ringer’s solution and the Tyrode’s solution, respectively. By measuring the open circuit potentials, polarization curves and AC impedance spectra in the three simulated body fluids and human blood, the HA6-coated Ti6Al4V alloy shows better electrochemical performance than the uncoated Ti6Al4V alloy.