In order to improve the surface wear resistance of materials,the effects of surface morphology generated by different electrochemical machining parameters on the tribological properties of materials were investigated.Electrochemical tests were carried out on 45 steel specimens to study the effects of electrolysis time on pit morphology and surface morphology on the friction properties of 45 steel specimens,as well as the effect of surface morphology on the friction properties of 45 steel specimens under dry friction and lack of oil lubrication.The results show that the surface of the specimen becomes smooth after electrochemical machining.There are randomly distributed circular pits,and the distribution density of the circular pits increases with the increase of electrochemical machining time.The wear volume of specimens under two friction conditions has the same variation trend,which firstly decreases and then gradually increases with the increase of electrochemical machining time.When 20% sodium chloride is used as electrolyte,the surface pit diameter increases with the increase of electrolysis time,but too long electrolysis time will lead to the deterioration of surface quality.It can be concluded from the wear volume and friction coefficient obtained from the test that the best test group is the pit diameter range of 50 μm to 80 μm and the depth range of 5 μm to 10 μm,and compared with 45 steel specimens without electrolytic treatment,the wear volume decreases by 13% and 14% under dry friction and lack of oil lubrication condition,respectively.In the mixed electrolytic solution of 20% sodium chloride and 10% sodium hypochlorite,the optimal 45 steel specimen is obtained in the electrolysis time of 180 s,and the wear volume is reduced by 33% compared with the 45 steel specimen without electrolytic treatment.