摩擦速度对Ti-6Al-4V合金腐蚀磨损的影响

The Influence of Scratching Rate on the Corrosive Wear of Ti-6Al-4V Alloys

采用腐蚀摩擦磨损试验机,进行了Ti合金/Al2O3摩擦副在林格溶液介质中的腐蚀磨损试验。试验在改变摩擦速度时对材料的耐腐蚀性能及钝化膜的再生能力进行了探讨。结果表明:摩擦破坏了Ti合金表面的钝化膜使电流密度上升。电流密度随摩擦速度的增大而增大。但是,钝化膜再生能力随摩擦速度的增大而减小。摩擦速度影响到磨损形态,速度小时主要以磨粒磨损形态为主,随着速度的增大磨损形态将过渡为腐蚀磨损和粘着磨损。

Two types of corrosion wearing test of the Ti-6Al-4V alloy against Al2O3 in ringer solution were carried out, one was a free corrosion potential measurement with simultaneous application of wear damage and the other was potenfiostatic polarization testing with wear damage. The effect of scratching rate on Titanium alloy abrasive wear was analyzed using the reciprocating abrasion testing machine. The damage accumulation mechanism was discussed by observing the damaged surfaces with scanning electron microscope. It is concluded that in corrosion wear environment, a transition of wear type from abrasive to adhesive is observed with an increase in the scratching rates. A higher scratching rate prevents the regeneration of passive films on worn surfaces, and results in the generation of relatively large corrosion pits and the change in wear form. These results suggest that the scratching rate is an important factor that affects the damage accumulation process