为了研究激光重熔工艺对用喷射电沉积方法在45^#钢基体表面制备的纳米结构镍涂层性能的影响，采用扫描电镜和X射线衍射仪对涂层表面形貌和晶粒尺寸进行了分析，并对涂层做了表面显微硬度测试和耐腐蚀性试验，对激光重熔工艺对涂层性能影响进行了理论分析和实验验证。结果表明，在优选的工艺参数下，喷射电沉积制备的镍涂层由平均尺寸为13．7nm的纳米晶颗粒组成；经过激光重熔后，熔融区内的晶粒尺寸明显减小，涂层与基体由机械结合变为冶金结合，涂层的表面显微硬度和耐腐蚀性能得到明显的提高。这一结果对于促进激光加工技术在纳米材料的应用具有一定的理论意义和实际价值。

In order to study the effect of laser remelting on the property of the nanocrystalline nickel coating prepared by jet electrodepositing on the substrate of 45^# carbon steel,the coatings'surface morphology and the size of crystal were analyzed with scanning electron microscope and X-ray diffractometry,the microhardness and corrosion resistance of coatings were also tested,and the effect of laser remelting were discussed in theory and experiment. The results showed that the average size of crystal of jet electrodeposited nickel coating was 13.7nm under the optimum processing parameters. After laser remelting,the size of crystal of coating was greatly diminished,the bonding state between the coating and substrate becomes from mechanical combination to metallurgical combination,and the coating's microhardness,the corrosion resistance were obviously increased. This result has certain theory and practical significance in promoting laser processing technique in the application of nano-materials.