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FeS, MoS 2 , WS 2 , and Cu 2 S solid films were prepared on CoCrFeNiMo high entropy alloy (HEA), and their tribological performance was tested under water lubrication. The results show that the MoS 2 /CoCrFeNiMo and the Cu 2 S/CoCrFeNiMo composite coatings provided excellent tribological properties. The MoS 2  film of the MoS 2 /CoCrFeNiMo composite coating was not worn through at the load of 2  N,  providing a reduction of 86% of friction coefficient ( μ  = 0.03) and 69% of the wear rate (2.6810 −9   cm 3 /Nm ), compared to CoCrFeNiMo coating. At a higher applied load, the anti-wear performance of MoS 2  film deteriorated because the MoS 2  reacted with oxygen and water to form α-MoO 3 . α-MoO3 hinders the sliding between layers of MoS 2 , increasing the third-body abrasive wear of the CoCrFeNiMo coating. Unlike the MoS 2 /CoCrFeNiMo composite coating, the Cu 2 S/CoCrFeNiMo composite coating exhibited an improved friction coefficient and wear rate at all loads. This performance is a result of Cu 2 S reacting with oxygen and water to form Cu and CuO, protecting the CoCrFeNiMo coating from severe wear.

Investigation on the Tribological Properties of FeS, Cu 2 S, MoS 2 , and WS 2 Sulfide Films Under Water Lubrication