在新型恒温扭动微动腐蚀实验装置上,通过改变角位移幅值,在恒温37℃的25%血清溶液中对Ti6Al4V合金的扭动微动腐蚀行为进行了研究。实验结果表明,角位移幅值对扭动微动的运行区域及腐蚀行为有重要的影响,摩擦扭矩-角位移幅值（T-θ）曲线分别呈直线型、椭圆型和平行四边形型,Ti6Al4V合金的扭动微动运行区分别呈现部分滑移区、混合区及滑移区等3个微动运行区。当角位移幅值较小时,扭动磨损发生在接触边缘,损伤轻微;扭动微动对腐蚀几乎不产生影响,腐蚀电流和腐蚀电位随时间的曲线波动不大;随着角位移幅值的增大,接触表面产生强烈的塑性变形,损伤严重。腐蚀电流和腐蚀电位随时间的变化曲线表明,扭动微动对腐蚀的影响较大,呈磨损加速腐蚀的特征。
By changing the angle displacement amplitude,torsional fretting corrosion behaviors of Ti6Al4V alloy were studied in 25% serum solution of 37℃ in the new torsional fretting corrosion test device at constant temperature.The results showed that the angle displacement amplitude had an important effect on corrosion behaviors and running regimes of torsional fretting.The friction torque-angular displacement amplitude（T-θ） curves showed linear,elliptical and parallelogram type.Torsional fretting running regimes of Ti6Al4V alloy presented partal slip regime,mixed regime and slip regime.When the angle displacement amplitude was small,the torsional wear occurred at the edge of contact area and the damage was slight;torsional fretting had almost no influence on corrosion and the fluctuation of corrosion current and corrosion potential versus time curve was small.With the angle displacement amplitude increased,a strong plastic deformation occurred in the contact surface and the damage was severe.Corrosion current and corrosion potential versus time curves showed that the torsional fretting influenced corrosion strongly and wear accelerated corrosion.
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