类仿生溶液中电沉积羟基磷灰石涂层机理的探讨

Mechanism of electrodeposition of hydroxyapatite coatings in a modified simulated body fluid

在类仿生溶液中用电化学沉积法在阳极氧化后的钛表面直接得到了羟基磷灰石(HA)涂层,通过极化测量和电化学反应分析探讨了在类仿生溶液中电沉积羟基磷灰石涂层的过程,提出了电化学反应、扩散和涂层生长3个阶段的反应机理,理论计算的电化学反应电位和极化曲线所测得的转折电位有较好的一致性。研究结果表明在类仿生溶液中直接电沉积HA涂层具有明显优势,可以通过控制pH值和溶液成分制备出不同性能的HA涂层。

Hydroxyapatite （HA） coatings have been directly prepared on anodized titanium by an electrodeposition method in a modified simulated body fluid. The electrochemical reactions occurring during the process of deposition of HA coatings in the modified simulated body fluid were investigated by polarization measurements and a three step deposition mechanism has been proposed. The calculated reaction potentials correspond well to the potentials measured by polarization tests. Compared with the deposition process in ordinary solutions or simulated body fluids, the deposition of HA coatings in the modified simulated body fluid showed many advantages, and the coating properties may be adjusted by changing the composition and pH value of the depositing solutions.