ABSTRACT

To improve the corrosion resistance of magnesium (Mg) alloy under the physiological environment, fabrication of fluoridated hydroxyapatite (FHA) coating on micro-arc oxidised AZ91D Mg alloy was carried out by electrochemical deposition. The influence of electrochemical deposition time on surface morphology, phase composition, electrochemical properties, and degradation behaviour of the FHA coating was studied by SEM, XRD, electrochemical testing, and in-vitro immersion test, respectively. The results of the electrochemical test and in-vitro immersion test show that FHA coating can significantly improve corrosion resistance. In particular, the sample with deposition time of 60 min showed the minimum corrosion current density (1.26 × 10⁻⁶ A cm⁻²), which may be attributed to a significant decrease in the imperfections of the coating being achieved after this optimum deposition time.

摘要

为提高镁（Mg）合金在生理环境下的耐腐蚀性能，采用电化学沉积法在微弧氧化AZ91D镁合金上制备氟化羟基磷灰石（FHA）涂层。分别通过SEM、XRD、电化学测试和体外浸泡试验研究了电化学沉积时间对FHA涂层表面形貌、相组成、电化学性能和降解行为的影响。电化学测试和体外浸泡测试结果表明，FHA涂层可以显着提高耐腐蚀性能。特别是，沉积时间为 60 分钟的样品显示出最小腐蚀电流密度（1.26 × 10 ^-6  A cm ^-2)，这可能是由于在此最佳沉积时间后涂层的缺陷显着减少。