采用溶胶-凝胶法在45钢表面制备了Al2O3陶瓷涂层,研究了通过化学镀Ni-P层为中间过渡层对45钢表面Al2O3陶瓷涂层性能的影响。通过压入法和划痕法研究了膜基结合强度,观察了复合涂层压痕和划痕形貌,通过扫描电子显微镜(SEM)对复合涂层表面形貌进行了分析。结果表明,中间层与基体材料、Al2O3层与中间层结合良好,涂层均匀致密,表面显微硬度最大值为1030HV,压入法结果表明膜与45钢基体结合较好。 The Al2O3 ceramic coating was prepared on the surface of 45 steel by sol-gel method. The effect of electroless Ni-P coating on the properties of Al2O3 ceramic coating on 45 steel was studied. The bonding strength of the film substrate was studied by press-in method and scratch test. The indentation and scratch morphology of the composite coating were observed. The surface morphology of the composite coating was analyzed by scanning electron microscopy (SEM). The results show that the interface between Al 2 O 3 and the middle layer is well bonded and the coating is uniform and compact. The maximum microhardness of the surface is 1030 HV. The results of the press-in method show that the bonding between the film and 45 steel is better.