论文部分内容阅读
采用双层辉光等离子表面合金化技术对Q235钢进行表面渗Nb处理,用OM,SEM和XRD分析了渗Nb层的显微组织、化学成分及其相组成,并对其在5%H2SO4水溶液中的腐蚀性能进行了研究。结果表明:经过等离子渗Nb处理后可获得约25μm的表面合金渗层;渗层中Nb含量随渗层深度呈梯度变化,渗层与基体结合牢固;XRD表明渗层中形成了Nb,Fe2Nb,NbC等相。电化学测试结果表明:Q235渗Nb合金层较基体的耐蚀性能有较大的提高。
The Q235 steel was infiltrated with Nb by surface-glow plasma alloying. The microstructure, chemical composition and phase composition of the infiltrated Nb layer were analyzed by OM, SEM and XRD. The corrosion resistance of Q235 steel in 5% H2SO4 aqueous solution In the corrosion performance were studied. The results show that the surface alloying layer is about 25μm after plasma infiltration. The Nb content in the infiltrated layer changes with the depth of the infiltrated layer, and the infiltrated layer is firmly bonded to the substrate. XRD shows that Nb, Fe2Nb, NbC and other phases. Electrochemical test results show that: Q235 infiltration Nb alloy layer corrosion resistance than the matrix have greatly improved.