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采用微弧氧化技术在TC4钛合金表面制备了多孔陶瓷层,研究了其在Hank′s模拟体液中的电化学腐蚀行为,利用SEM和XRD分析了其表面形貌和物相组成。结果表明,微弧氧化合金的自腐蚀电位升高约0.3V,提高了TC4钛合金在生物体液环境下的化学稳定性。在钛合金植入体电位范围内,微弧氧化处理可明显提高极化电阻,减少腐蚀电流1~2个数量级。随腐蚀时间的延长,TC4钛合金表面钝化膜逐渐发生腐蚀,而微弧氧化膜浸泡初期HA的形核及生长是电极反应中最活跃部分,2周后表面形成均匀的HA薄膜,表现出良好的抗电化学腐蚀性能。
The porous ceramic layer was prepared on the surface of TC4 titanium alloy by micro-arc oxidation technology. The electrochemical corrosion behavior of the ceramic layer on the surface of TC4 titanium alloy was studied. The surface morphology and phase composition of the alloy were analyzed by SEM and XRD. The results show that the corrosion potential of micro-arc oxidation alloy increases about 0.3V, which improves the chemical stability of TC4 titanium alloy in biological fluid environment. In the potential range of titanium alloy implant, micro-arc oxidation can significantly improve the polarization resistance, reducing the corrosion current of 1 to 2 orders of magnitude. With the prolongation of etching time, the passivation film of TC4 titanium alloy gradually eroded, and the nucleation and growth of HA during the initial immersion of micro-arc oxidation film was the most active part of the electrode reaction. After 2 weeks, a uniform HA film was formed on the surface, Good resistance to electrochemical corrosion.