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采用等离子表面合金化技术在不锈钢表面制备含Nb合金层,分析了典型渗层的显微组织形貌、成分分布及相结构,考察了含Nb含金层的腐蚀性能。结果表明,优化的工艺参数为:温度1100℃、工作气压80 Pa、保温时间3 h、源极电压900–700 V、阴极电压600–450 V。含Nb合金层厚度为60μm,表层Nb含量可达50%左右,呈梯度下降分布特征,表层主要由NbC、Nb6C5、Cr2Nb、Fe2Nb等相构成。相比不锈钢基体,Nb合金化后耐晶间腐蚀性能和均匀腐蚀性能均得到提高。
The Nb-containing alloy layer was prepared on the surface of stainless steel by plasma surface alloying. The microstructure, composition and phase structure of the typical layer were analyzed. The corrosion behavior of Nb-containing layer was investigated. The results show that the optimized process parameters are: temperature 1100 ℃, working pressure 80 Pa, holding time 3 h, source voltage 900-700 V, cathode voltage 600-450 V. Nb alloy layer thickness of 60μm, surface Nb content of up to about 50%, a gradient decline distribution, the surface layer mainly composed of NbC, Nb6C5, Cr2Nb, Fe2Nb phase. Compared with stainless steel matrix, Nb alloying resistance to intergranular corrosion and uniform corrosion properties are improved.