碳基和氮化物基涂层的摩擦-腐蚀交互行为的原位研究

In- situ Study of Tribocorrosion Behavior of Carbon- Based and Nitride- Based Coatings

海洋装备大量关键金属运动部件同时承受摩擦与腐蚀作用,其表面防护涂层在海水环境下的抗磨擦-腐蚀性能成为考察涂层性能优劣的关键.本文中采用摩擦-腐蚀试验机原位实时监测了DLC、Cr-DLC、Cr N与Ti N四种涂层与氧化铝陶瓷摩擦副在人工海水环境下的开路电位和摩擦系数等腐蚀-磨损特性,并采用动电位扫描法测试了四种涂层在腐蚀和摩擦-腐蚀过程中的电化学行为,综合分析了涂层在海水介质中的磨损-腐蚀交互机制.研究结果表明:非晶结构的碳基涂层在海水介质中具有优异的抗腐蚀和抗摩擦-腐蚀性能,其中金属铬的掺入能够进一步提高DLC涂层的抗摩擦-腐蚀性能;而氮化物基涂层的粗大柱状晶结构显著削弱了其在海水环境中的抗摩擦-腐蚀性能.

A number of key marine equipment metal components with stand friction and corrosion at the same time. The tribocorrosion resistance of the protective coating on these metal components in seawater environment become very important for performance of coating. In this study,a tribocorrosion apparatus was used to in- situ real time monitor the tribocorrosion characteristics( open circuit potential and friction coefficient) of the DLC,Cr- DLC,Cr N and Ti N coating sliding against alumina in artificial seawater environment. Potentiodynamic scanning method was used to investigate electrochemical behavior of the four kinds of coatings in the process of corrosion and tribocorrosion,and interaction mechanism between wear and corrosion was analyzed. Research results show that the amorphous carbon- based coating had excellent corrosion and tribocorrosion resistance in seawater. In addition,the chromium in the coating improved the tribocorrosion resistance of DLC coating. However,the tribocorrosion resistance of nitride- based coating was significantly weakened because of bulky columnar crystal structure.