采用摩擦失重法、电化学测试以及扫描电子显微镜等技术研究TC4钛合金在模拟海水环境中的腐蚀和腐蚀磨损行为,分析电化学状态对TC4钛合金钝化行为、钝化膜失效机制及腐蚀磨损协同作用的影响。结果表明,摩擦过程中TC4钛合金的开路电位明显负移,而且该合金的腐蚀电流密度相比静态腐蚀时提高了3个数量级。合金的腐蚀磨损失重随着电位的升高明显增大,磨蚀与磨损之间存在明显的协同作用,高电位时的腐蚀速度较大但是摩擦因数较低。电位在OCP和0.9 V之间变化时,纯机械磨损量在总腐蚀磨损量中的比重随着电位的升高逐渐降低,而磨损对腐蚀的促进量和腐蚀对磨损的促进量在总腐蚀磨损量中的比重在高电位时尤其显著。

The electrochemical and corrosion–wear behaviors of TC4 alloy in artificial seawater were studied. And the influences of electrochemical state on passive behavior, failure mechanism of passive film and corrosion–wear synergy were emphatically analyzed. The corrosion–wear analysis of the alloy was fulfilled by methods of mass loss, electrochemical testing and scanning electron microscope (SEM). It can be observed that the cathodic shift of open circuit potential and three order of magnitude increase of current density can be obtained during corrosion–wear process. Total corrosion–wear loss increases with increasing applied potential, confirming the synergy between wear and corrosion. High polarisation potential results in low coefficient of friction and high corrosion rate. The relative contribution of pure mechanical wear to total material loss deceases obviously with the increase of potential from open circuit potential to 0.9 V during corrosion–wear. Contributions of wear-induced-corrosion and corrosion-induced-wear are significant especially at higher potentials.