Abstract: 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,CrN and TiN 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.