镁合金表面电化学沉积制备羟基磷灰石涂层及耐腐蚀性能的研究

Preparation and corrosion resistance of hydroxyapatite coatings on magnesium alloy by electrochemical deposition

采用电化学沉积技术和水热合成技术在镁合金表面制备出均匀的羟基磷灰石(HA)涂层。运用扫描电镜(SEM)分析涂层的微观形貌、运用能谱(EDS)分析涂层的元素组成、和运用X射线衍射仪(XRD)分析涂层相的组成,并且在人体模拟液(SBF)中考察了其电化学性能。结果表明:与恒电流沉积制备出的HA相比,脉冲电流沉积制备出的涂层更加均匀致密;与镁合金基体的自腐蚀电流密度8.407×10^(-4) A/cm^2比较,恒电流和脉冲电流沉积的涂层自腐蚀电流密度分别为2.780×10^(-5)和5.582×10^(-7) A/cm^2,其耐蚀性明显得到提高。在镁合金表面用电化学沉积法制备的羟基磷灰石涂层可以有效的降低镁合金的降解率,从而使得镁合金进一步应用于生物材料。

Uniform hydroxyapatite（HA）coating was prepared on the surface of magnesium alloy by electrochemical deposition and hydrothermal synthesis.The microstructures of the coatings were analyzed by scanning electron microscopy（SEM）.The element composition of the coatings was analyzed by EDS.The phase composition of the coating was analyzed by X-ray diffraction（XRD）.And the electrochemical properties of the coating were investigated in SBF.The results show that compared with the HA coating prepared by constant current deposition,the coating prepared by pulse current deposition was more uniform and dense.Compared with the corrosion current density of magnesium alloy（8.407×10-4 A/cm2）,the layers prepared by constant current（2.780×10-5 A/cm2）and pulse current（5.582×10-7 A/cm2）perform better corrosion resistance.HA coatings on magnesium alloy can effectively decrease the degradation rate of magnesium alloy,thus magnesium alloy with HA coatings can be further applied in orthopedic implants.