两种电化学方法对制备羟基磷灰石涂层的差异性研究

Study on difference of hydroxyapatite coatings prepared by two electrochemical methods

通过恒电流和脉冲电流技术在钛基表面制备磷酸钙,然后经热碱处理得到羟基磷灰石(HAP)涂层。利用X射线衍射(XRD)、红外光谱(FT-IR)和扫描电镜(SEM)等手段对涂层的结构及形貌进行了表征,并对涂层的耐腐蚀性进行了研究。结果表明,恒电流与脉冲电流技术均可在钛基表面电沉积羟基磷灰石涂层,所得的2种涂层均具有良好的生物相容性;与恒电流方法制得的涂层相比,脉冲电流技术制得的涂层更均匀、致密,与基体结合强度较高,在模拟体液中表现出较好的耐腐蚀性。

Calcium phosphate was prepared on the surface of titanium substrate with constant and pulsed current technologies, and then treated with hot alkali to form hydroxyapatite （HAP） coatings. The structures and morphologies of the coatings were characterized by X-ray diffraction （XRD）, FT-IR spectroscopy and SEM. The corrosion resistance of the coatings was studied. The results showed that both constant and pulsed current electrodeposition technologies can form hydroxyapatite coatings with good biological compatibility on the surface of titanium substrate. Compared with the coating prepared by constant current, the coating prepared by pulsed current is more uniform and compact, has better adhesion to the substrate, and exhibits better corrosion resistance in simulated body fluid.