Interaction Study Of Frictional Corrosion Of High-entropy Alloy-amorphous Carbon Composite Film

The offshore equipment faces harsh service environment such as corrosion of aggressive ions and frictional wear between parts and components,and its durability provides a good guarantee for the development of marine economy and resources.For the surface protection needs of offshore equipment,it is of great engineering value to develop surface film materials with good corrosion and wear resistance properties.High-entropy alloy films have attracted wide attention from researchers due to their high plasticity,excellent wear and corrosion resistance.However,high-entropy alloy films with face-centered cubic structure tend to have low strength.The addition of carbon elements can improve the strength,hardness and wear resistance of the alloy,and the deposition of excess carbon also results in amorphous carbon films with high hardness and high elastic modulus,excellent tribological properties and chemical inertness.However,there is a lack of basic research data on the tribological properties,corrosion resistance and tribocorrosion interaction mechanisms of amorphous carbon-high entropy alloy composite films.In this paper,an open-source friction tester capable of completing friction corrosion experiments was developed.Based on the completion of the performance verification of the tester,the friction wear performance and corrosion resistance of the composite films were evaluated using the friction tester and electrochemical workstation.The test results showed that the hardness of the amorphous carbon-high entropy alloy composite film increased to18.29±0.53 GPa,and the I_D/I_G value of the film surface decreased to 1.338.The amorphous carbon increased the hardness of the composite film and improved its tribological properties;the DLC film showed higher corrosion resistance in 3.5 wt.%Na Cl solution,and the increase of the amorphous carbon content made the composite film The increase in amorphous carbon content reduced the graphite phase of the composite films,while the fewer pore defects weakened the intrusion of corrosive ions in the brine solution,thus slowing down the corrosion.The films were prefabricated by corrosion and then subjected to friction tests.The friction coefficient of DLC films was elevated to 0.1041 and the hardness value was reduced to 18.35 GPa after corrosion,and the results indicated that the corrosion effect could reduce the mechanical properties of the films and decrease the film hardness and friction reduction effect.The film was prefabricated by friction and then tested for corrosion resistance.The film corrosion current of DLC film was elevated to 9.410×10-8 A after friction,and the results indicated that the film would crack and peel off during the friction process,thus reducing the corrosion resistance of the composite film.The tribological test of the film under salt water environment,the film friction coefficient in the salt water environment showed a significant decrease,the results indicate that the friction chemical reaction occurred in the friction process to generate chromium chloride,thus increasing lubrication and reducing contact interface friction;the corrosion resistance test of the film after friction in the salt water environment,the results indicate that the corrosion resistance of the composite film increased due to the generation of chromium hydroxide oxide film.