Abstract:Wear and corrosion resistance of polycrystalline copper (PC) and monocrystalline copper (MC) were studied comparatively.The friction and wear behaviors of MC and PC at different loads and sliding speeds under dry sliding conditions were studied.The difference of solution corrosion and electrochemical corrosion of MC and PC at 35% NaCl solution was investigated respectively.The results show that the friction coefficient of polycrystalline copper is higher than that of monocrystalline copper under the rotation speeds from 100 to 400 r/min and dry sliding conditions,while the wear loss of the polycrystalline copper is lower than that of monocrystalline copper.The friction coefficient of polycrystalline copper is higher than that of monocrystalline copper under the loads from 25 to 40 N and dry sliding conditions.MC has higher corrosion resistance than PM in the NaCl solution.The main mechanism of PC/steel is adhesive wear,and the main mechanism of MC/steel is delaminated wear.Different plastic deformation ability of contact surface,grain orientation and distribution of grain boundary can be attributed to different wear and corrosion behavior of MC and PC coupled with steels.MC has a high grain preferred orientation with columnar grain boundaries and can induce large plastic strain.The preferred orientation of grain makes MC has a dense arrange on the crystal plane in microstructure,and the decrease of grain boundaries inhibits the expansion of corrosion,so the corrosion resistance of MC is improved.
