为提高27SiMn钢表面的耐磨性、耐蚀性等性能，在27SiMn钢上熔覆Fe302以及与La2O3、B4C的复合粉末。利用XJL-02A金相显微镜等设备观察并测试涂层的显微硬度、耐磨性及耐蚀性。结果表明：涂层与基体形成良好的冶金结合，微观组织主要由平面晶或胞状晶、粗大的柱状树枝晶以及表层细小的树枝晶或等轴晶组成；在Fe302中添加1%La2O3、5%B4C，涂层组织更细小，且硬度、耐磨性和耐蚀性都比Fe302涂层好。
In order to improve the surface wear resistance and corrosion resistance of 27SiMn steel. Fe302 self-fluxing alloy powder and the mixture powder of Fe302,B4C and La2O3 were cladded on 27SiMn steel by flame cladding. The microstructure of coating was analyzed using XJL-02A optical microscope. Micro hardness,wear resistance and corrosion resistance were also measured. The results show that the metallurgical combination is formed between coating and substrate. The microstructure consists of planar crystal,cellular dendrite,coarse columnar dendrites and fine equiaxed crystal. With the addition of 1%La2O3, 5%B4C in Fe302 powder,the microstructure of coating becomes finer,the micro-hardness,wear resistance and corrosion resistance are higher than those of Fe302 coating.
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