Effect of current density on nickel-nano-alumina composite coating jet-electrodeposited on engine bearing shell
[Introduction]The effect of current density on the structure,wear resistance,and corrosion resistance of Ni-Al2O3 composite coating jet-electrodeposited on the surface of engine bearing shell needs to be studied.[Method]The properties of Ni-Al2O3 composite coatings jet-electrodeposited at different current densities were compared through surface morphology observation,X-ray diffraction analysis,microhardness measurement,friction and wear test,and neutral salt spray test.[Result]The Ni-Al2O3 composite coating jet-electrodeposited at a current density of 60 A/dm2 exhibited the most uniform and compact surface with the smallest grain size,the highest microhardness about 735.0 HV,and the best wear and corrosion resistance.[Conclusion]The jet electrodeposition of Ni-Al2O3 composite coating can significantly enhance the wear and corrosion resistance of engine bearing shell.
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