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利用喷射电镀方法在45钢基体表面制备了Ni-Al2O3纳米复合镀层,并对其进行了激光重熔处理。采用扫描电镜分析了Ni-Al2O3复合镀层和激光重熔层的微观组织,利用X射线能谱仪对镀层的元素进行元素分析,分别测试了基体材料及经过激光作用前后复合镀层的耐腐蚀性。结果表明:在优化的实验参数条件下,喷射电镀工艺能够制备出1.44wt%的纳米Ni-Al2O3的复合镀层,激光处理后,强化层与基体形成冶金结合,与基体相比,镀件的耐腐蚀性明显提高。
The Ni-Al2O3 nano-composite coating was prepared on the surface of 45 steel substrate by spray electroplating and laser remelted. The microstructure of the Ni-Al2O3 composite coating and the laser remelted layer was analyzed by scanning electron microscopy. The elemental analysis of the coating was carried out by X-ray energy dispersive spectroscopy. The corrosion resistance of the matrix material and the composite coating before and after laser irradiation were tested. The results show that under the optimal experimental parameters, the spray electroplating process can prepare a composite coating of 1.44wt% nano-Ni-Al2O3. After laser treatment, the strengthening layer forms a metallurgical bond with the matrix. Compared with the matrix, Corrosivity improved significantly.