Ti-6Al-4V合金氮离子注入后在Tyrode’s体液中的耐蚀耐磨性能  

Corrosion Resistance and Wear Resistance of Nitrogen Ion Implanted Ti-6Al-4V Alloy in Tyrode's Simulated Body Fluid

作　　者：于乾乾[1] 梁成浩[1] 黄乃宝[1] 李杰兰[1] 王树森[1] 贾理男[1] 

机构地区：[1]大连海事大学交通运输装备与海洋工程学院,辽宁大连116026

出　　处：《材料保护》2014年第6期66-68,8,共3页Materials Protection

基　　金：国家高技术研究发展计划资助项目(2009AA05Z120);大连海事大学船机修造工程交通行业重点实验室开放课题(ZCJX2201302)资助

摘　　要：Ti-6Al-4V合金注入氮离子后,生物相容性、抗磨损性、抗疲劳性及抗腐蚀性均有所提高,其植入人体后在体液中的耐蚀耐磨性能尤为重要,目前对此研究较少。对Ti-6Al-4V合金进行氮离子注入,并在人工模拟体液Tyrode’s溶液中进行摩擦磨损和电化学试验,研究了注氮Ti-6Al-4V合金的耐蚀耐磨性能。采用扫描电镜观察腐蚀形貌,用其自带的能谱仪分析注氮层的元素组成,采用X射线衍射仪分析注氮层的结构。结果表明:Ti-6Al-4V氮离子注入后表面形成主要由TiC,Ti及少量TiO2组成的膜层,硬度提高,在Tyrode’s溶液中的腐蚀电位升高、极化电阻增大,阳极极极化电流密度降低;在Tyrode’s溶液中摩擦后的注氮Ti-6Al-4V合金的阳极极化电流密度大于未摩擦的,极化电阻减小;Ti-6Al-4V合金氮离子注入后的摩擦系数明显降低,比磨损率减少。Nitrogen ion implantation of Ti-6A1-4V alloy was conducted.The corrosion behavior as well as the friction and wear behavior of resultant nitrogen ion implanted Ti-based alloy in Tyrode's simulated body fluid was evaluated.The morphology of the corroded surface was observed with a scanning electron microscope,while the elemental composition and phase structure of the nitrogen ion implanted layer were analyzed by energy dispersive spectrometry and X-ray diffraction.Results indicated that a disordered film composed of TiC,Ti and a small amount of TiO_2 was formed on the surface of Ti-6A1-4V after nitrogen ion implantation,thereby resulting in increased hardness.After nitrogen ion implantation,the corrosion potential of the Ti-6A1-4V alloy in Tyrode' s simulated body fluid rose,while its polarization resistance increased and its anodic polarization current density decreased.As compared with the nitrogen ion implanted Ti-based alloy sample which did not undergo friction and wear test,the one which underwent friction and wear test in Tyrode' s simulated body fluid exhibited increased anodic polarization current density and reduced polarization resistance.Moreover,the Ti-6Al-4V alloy after nitrogen ion implantation exhibited greatly reduced friction coefficient and declined specific wear rate.

关 键 词：氮离子注入 TI-6AL-4V合金 Tyrode’s溶液 电化学性能 耐蚀性能 摩擦性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG146.23[金属学及工艺—金属学]