摘要
研究在医用Ti6Al4V合金上采用阴极电弧蒸发沉积制备的纳米晶TiAlN涂层的表面特性和体外腐蚀性能。采用XRD和FE-SEM对其结构和表面形貌进行分析,采用显微压痕法表征其表面的显微硬度,在模拟体液和人工唾液中进行体外腐蚀实验。结果表明:与无涂层合金相比,沉积TiAlN涂层后合金的表面硬度提高,为44.4 GPa,弹性模量为419.9 GPa,塑性变形能力增强,润湿角由(70.61±1.25)°增大到(86.27±2.2)°。生物腐蚀实验表明,沉积TiAlN涂层后,Ti6Al4V合金的腐蚀电位显著正移约150 m V,腐蚀电流密度显著降低约一个数量级,电荷转移电阻提高,证明合金的耐腐蚀性提高。与无涂层的合金相比,沉积TiAlN涂层后合金的表面性能、力学性能和耐腐蚀性能均有所提高。
The surface characteristics and in vitro corrosion properties of nanocrystalline Ti Al N coating deposited on biomedical Ti6Al4V alloy by cathodic arc evaporation were studied.The structure and surface morphology were analyzed using XRD and FE-SEM.The surface microhardness was characterized using microindentation.The in vitro corrosion was carried out in simulated body fluid and artificial saliva.The results exhibited that a Ti Al N film was deposited with an enhanced surface hardness of 44.4 GPa,a elastic modulus of 419.9 GPa,and enhanced resistance to plastic deformation compared to uncoated alloy.The wetting angle of Ti Al N coated surfaces((86.27±2.2)°)was larger than that of uncoated Ti6Al4V surfaces((70.61±1.25)°).Biocorrosion examinations revealed that Ti Al N-coated Ti6Al4V alloy exhibited a significant positive shift of about 150 m V in corrosion potential with the notable reduction of about one order of magnitude in corrosion current density and higher charge transfer resistance,confirming the improved barrier performance.The surface,mechanical and corrosion performance of Ti Al N coating was enhanced compared to uncoated alloy.
作者
Mohamed HUSSEIN
Madhan KUMAR
Nestor ANKAH
Ahmed ABDELAAL
Mohamed HUSSEIN;Madhan KUMAR;Nestor ANKAH;Ahmed ABDELAAL(Interdisciplinary Research Center for Advanced Materials,King Fahd University of Petroleum&Minerals,Dhahran 31261,Saudi Arabia;Department of Mechanical Engineering,King Fahd University of Petroleum&Minerals,Dhahran 31261,Saudi Arabia)
基金
King Fahd University of Petroleum&Minerals for the provided support。
