摘要
应用阳极氧化和微弧氧化的方法分别制作了TC4(Ti-6Al-4V)表面氧化膜,分别在0.9% NaCl溶液和模拟人工体液中以PTFE盘作摩擦偶件,在圆平动盘销式摩擦磨损试验机进行摩擦电化学试验,获得了对应的摩擦系数,采用三电极体系得到摩擦电化学特性曲线.结果表明,静态时微弧氧化膜耐蚀性比阳极氧化膜提高了近2个数量级;与基体相比,TC4的阳极氧化膜的耐蚀性增强,摩擦系数降低,处理电压越高,摩擦系数越小;虽然TC4的微弧氧化膜的耐腐蚀性能均较阳极氧化膜有大幅度提高,但摩擦系数均较未处理的TC4的摩擦系数大,其中处理时间为20min的微弧氧化膜表现出良好的耐蚀和摩擦性能,通过对磨损试件的SEM形貌对比解释了微弧氧化膜摩擦系数较大的原因,这与膜层表面粗糙度和微孔孔径大小有关.
The tribo - electrochemical behaviors of oxide films on titanium alloy TC4 （ Ti - 6Al - 4V） were investigated in 0.9% NaCl and simulated body fluid by using a translational pin - on - disc friction tester. The anode oxide films and micro -arc oxidation coatings were prepared on TC4 and VrFE was used as opposite rubbing materiel. The friction coefficient curves were obtained from the tester and the corresponding tribo -electrochemical curves were achieved from a connected three - electrode system. The corrosion resistance of micro - arc oxidation coating was found to be about 2 orders of magnitude higher than that of anode oxide film under static state. Anode oxide films on TC4 showed better corrosion resistance and lower friction coefficient than that of TC4 substrate. The higher the treated voltage was, the lower the friction coefficient. Although micro - arc oxidation coatings on TC4 demonstrated a remarkable increase in corrosion resistance, their friction coefficients were higher than that of untreated TC4. The micro - are oxidation coating treated for 20 minutes showed a better corrosion resistance and frictional performance. By comparing the SEM surface morphologies of the worn test pieces, the reasons for high friction of micro - arc oxidation films were analyzed, which was related to the large micro - hole diameter and surface roughness of micro- arc oxidation coating.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2009年第5期425-431,共7页
Tribology
关键词
摩擦电化学行为
微弧氧化膜
生理介质
characteristic of tribo - electrochemistry, micro - arc oxidation coating, simulated body fluid
