Abstract: Taking 25Cr3Mo low alloy steel as the research object,the corrosion and wear behavior of 25Cr3Mo steel for sliding shoes of coal mining machine under three simulated mine water environments (acidic,neutral,and alkaline) were studied. By analyzing the friction coefficient curve,wear morphology,element distribution,chemical state and quantitatively calculating the specific wear rate under different conditions,the damage mechanism of shearer sliding shoes under simulated mine water was elucidated. The results show that the stable friction coefficient of 25Cr3Mo steel in acidic and neutral mine environments is approximately 0.15,whereas it decreases to 0.10 in alkaline mine water,both of which are lower than the friction coefficient under dry friction conditions (0.27). The wear rate of 25Cr3Mo steel in simulated mining water environments can be reduced by one order of magnitude compared with that under dry friction. However,the surface of 25Cr3Mo steel in the simulated mining water environments exhibits a significant number of corrosion pits with a maximum depth up to 3.42 μm. Under acidic and neutral conditions,the corrosion products on the 25Cr3Mo surface consist of Fe₃O₄.Moreover,a considerable number of microcracks emerge within the corrosion product layer under acidic condition.However,under alkaline mine water,the corrosion products consist of Fe₃O₄,α-FeOOH and α-Fe₂O₃.