铁素体不锈钢表面电沉积-热处理制备Co-Mn尖晶石涂层的研究进展

Advances on Electrodeposition-thermal Treatment Preparation of Co-Mn Spinel Coatings on Ferritic Stainless Steel Surface

铁素体不锈钢(ferritic stainless steel,FSS)是中温化环境中固体氧化物燃料电池(solid oxide fuel cell,SOFC)的理想连接体材料。但由于FSS中含有较多的Cr元素,在SOFC工作过程中,连接体表面生成的Cr氧化物薄膜增厚,会造成连接体导电性能下降;FSS中的Cr元素与H_(2)O或O_(2)发生反应,还会形成易挥发的化合物,这些化合物在阴极界面沉积,将使阴极活性降低,导致阴极“Cr中毒”和SOFC性能衰减,严重制约了SOFC商业化发展和应用。采用电沉积-热处理技术在FSS表面制备Co-Mn尖晶石保护涂层可有效防止Cr化合物的挥发,改善电池堆的抗氧化性能。在保证SOFC导电性的同时,延长其使用寿命。综述了FSS表面电沉积-热处理制备Co-Mn尖晶石涂层的主要方法、特点及涂层性能等方面的研究进展,对该领域未来的发展趋势进行了展望。

Ferritic stainless steel(FSS)is a kind of ideal interconnect material for solid oxide fuel cell(SOFC)in medium temperature environment.However,because there are considerable amounts of Cr in FSS,the Cr scale forming on the surface of the interconnects gradually become thicker during the working process of SOFC,which reduce the conductivity of the interconnects.In addition,Cr in FSS react with H_(2)O or O_(2) and the volatile Cr compounds form.When the compounds pass through the cathode and deposited at the cathode interface,the activity of the cathode reduces,resulting in the“Cr poisoning”of the cathode and degradation of the SOFC performance.Consequently,the commercial development and application of SOFC has been seriously restricted.Co-Mn spinel protective coating on the surface of FSS prepared by electrodeposition-thermal treatment method can effectively prevent the volatilization of Cr compounds,improve the oxidation resistance of the battery stack,and prolong the service life of SOFC on the basis of ensuring its conductivity.The research progress and the state of art in aspects of the electrodeposition-thermal treatment methods,characteristics and performance of the Co-Mn spinel coating prepared on FSS interconnect surface were reviewed,and some suggestions for the future development trend in the field were proposed.