钢材表面熔盐合金化Fe_3Si层抗蚀性能研究  

Study on Corrosion Resistance Properties of Alloying Fe_3Si Layer Prepared on Steels in Molten Salt

作　　者：薛娟琴[1] 刘妮娜[1] 黄薇[1] 唐长斌[1] 许妮君[1] 

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《热加工工艺》2016年第2期164-166,170,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51278407;51478379;51408468)

摘　　要：利用熔盐非电解沉积法在20钢和2Cr13不锈钢表面进行渗硅处理,借助扫描电镜分析了渗层剖面形貌和成分分布,X射线衍射仪确认物相组成,利用动态极化曲线及交流阻抗谱电化学技术评价各Fe_3Si渗层的耐H_2SO_4介质电化学腐蚀性能。结果表明,钢材表面熔盐合金化制备的Fe_3Si渗层具有优异的抗H_2SO_4介质电化学腐蚀性能;不锈钢中的Cr合金元素的存在能加快熔盐渗硅速率,有助于缺陷的减少和渗层致密性的改善,Cr合金元素共同参与形成的多元Fe_3Si型过渡族金属硅化物具有优异的腐蚀抗力。Electroless Fe3Si alloyed layers were prepared by siliconizing in the molten salt on the surface of 20 steel and 2Cr13 stainless steel, respectively. The sectional morphologies and ingredient distribution were analyzed by SEM. The phase of silicided layers was verified by XRD. Dynamic polarization curve measure and electrochemical impedance spectroscopy technique were used to evaluate electrochemical corrosion resistance of Fe3Si diffusion layers in H2SO4 medium. The results show that electroless Fe3Si coatings prepared in molten salt can significantly improve electrochemical corrosion resistance in H2SO4 medium. The Cr alloy elements existing in steel can speed up the siliconizing rate in the molten salt, and help the defect reduction and structure densification. The transition metal silicide （multi-elements alloying Fe3Si contained Cr） coating has excellent corrosion resistance.

关 键 词：熔盐表面合金化 Fe_3Si金属间化合物 H2SO4介质腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]