TC4钛合金在模拟海水中腐蚀?磨损交互行为研究

采用自制摩擦腐蚀装置研究了TC4钛合金在模拟海水中电化学腐蚀与机械磨损间的交互作用，探究了不同电化学状态对TC4钛合金腐蚀磨损行为的影响. 在摩擦腐蚀过程中，TC4钛合金的腐蚀电位发生负偏移，腐蚀电流随着外加电位升高而增大，在零电流电势(OCP)附近TC4钛合金获得最低摩擦系数. TC4钛合金总体积损失随着外加电位的增加而增大，证实了腐蚀磨损交的交互作用随着外加电位的增加而增强；当电位从–0.5 V增大至0.8 V时，腐蚀磨损交互作用导致的材料损失占总材料损失的比例由12%增加至66%，其中腐蚀诱导磨损导致的损失量占比由7%增加至44%. OCP及其以下外加电位条件下，TC4钛合金的磨损机制为磨粒磨损；0 V电位下TC4钛合金磨损机制为磨粒磨损和疲劳磨损；0.8 V电位下TC4钛合金的磨损机制为磨粒磨损和摩擦诱导的腐蚀磨损. 

Corrosion-Wear Interaction Behavior of TC4 Titanium Alloy in Simulated Seawater

The interaction between electrochemical corrosion and mechanical wear of TC4 titanium alloy in simulated seawater was studied by using a self-made tribocorrosion device. The effects of electrochemical parameter on the corrosion and wear of TC4 titanium alloy were discussed. During the trobicorrosion process, the corrosion potential of TC4 titanium alloy shifted toward more negative values, and the corrosion current increased along with the increase of the applied potential, and the lowest friction coefficient of TC4 titanium alloy was obtained under the current potential of about zero (OCP). The fact that the loss of TC4 titanium alloy volume increased along with the increase of the applied potential, confirming that the interaction between corrosion and wear was enhanced along with the increase of the applied potential. When the potential increased from –0.5 V to 0.8 V, the material loss caused by the interaction of corrosion and wear increased from 12% to 66%, and the loss caused by corrosion-induced wear increased from 7% to 44%. Under applied potential equal or lower than OCP, the wear mechanism of TC4 titanium alloy was abrasive wear. The wear mechanism of TC4 titanium alloy at a potential of 0 V was abrasive wear and fatigue wear. The wear mechanism of TC4 titanium alloy at a potential of 0.8 V was abrasive wear and friction-induced corrosion wear.