Abstract
The surface failure of engine camshaft was introduced. The surface repairing technologies of failure camshaft such as thermal spraying, laser cladding and electro-brush plating were analyzed comparatively. The characteristics of the process of repairing camshaft by electro-brush plating technology were introduced. The effects of plating solutions of rapid nickel, Ni-Co, Ni-Wu and nano Al2O3/Ni on surface properties of camshaft coatings were experimentally studied. It is concluded that the electro-brush plating technology can be applied to repair failure camshafts due to simple equipment, fast repairing speed and high bonding strength between substrate and coatings. The surface morphology of the nano Al2O3/Ni coating is the most uniform and compact, and the hardness of the coating is higher than substrate's. The hardness of the rapid nickel coating is the highest, but the coating surface morphology is relatively coarse and uneven. Nano particles have a significant refining effect on coatings. Using nano Al2O3/Ni electro-brush plating technology to repair surface failure camshaft can improve surface hardness and make it remanufactured and utilized.
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