铁素体不锈钢因具有良好的耐腐蚀性、高电导率、高热导率等诸多优异性能，是常用的中低温固体氧化物燃料电池(SOFC)用连接体材料，但是含Cr不锈钢在600~800 ℃的SOFC工作温度下存在高温氧化带来的界面电阻增大、Cr元素毒化阴极等问题。从连接体材料、防护涂层种类及其制备方法出发，简述了金属连接体材料的选择和Cr毒化阴极机理，重点阐述了活性元素氧化物涂层、稀土钙钛矿涂层以及尖晶石涂层对连接体的保护作用和近些年新的研究进展，并归纳了SOFC金属连接体表面涂层常用的制备方法和特点。介绍了稀土元素氧化物涂层对合金氧化膜的影响机制和应用局限性。总结了La1–xSrxCrO3、La1–xSrxCoO3、La1–xSrxMnO3等常用钙钛矿涂层的优势和不足，并分析了掺杂对钙钛矿涂层性能的影响。重点综述了过渡金属元素掺杂、稀土元素掺杂对Mn-Co、Cu-Mn尖晶石涂层电导率、热膨胀系数匹配性、涂层结合情况等的影响，元素掺杂在一定程度上可以改善涂层的电导率和提高阻Cr效果，但是仍需要进一步研究掺杂量、长期稳定性等问题。最后，对金属连接体防护涂层存在的问题和今后研究工作的重点作出了展望。

Ferritic stainless steel is one of the most promising interconnects for medium and low temperature solid oxide fuel cell (SOFC) due to the excellent properties such as good corrosion resistance, high electrical conductivity and high thermal conductivity. However, at 600-800 ℃ operating temperature of SOFC, the chromium-containing stainless steel has problems such as increased interface resistance caused by high-temperature oxidation and Cr element poisoning cathode material. The selection of metal interconnects and the mechanism of Cr poisoning cathodes were briefly described in terms of the types and preparation methods of protective coatings for interconnects. Then, the protective effects of active element oxide coatings, rare earth perovskite coatings and spinel coatings on the interconnects as well as the new research progress in recent years were mainly reviewed. The commonly used preparation methods and characteristics of the surface coatings for SOFC metal interconnect were also summarized. The effect mechanism and application limitations of rare earth element oxide coatings on alloy oxide film were introduced. The advantages and disadvantages of common perovskite coatings were concluded, such as La1–xSrxCrO3, La1–xSrxCoO3, La1–xSrxMnO3, etc. The effects of doping on the performance of perovskite coatings were also analyzed. The effects of transition metal element doping and rare earth element doping on the conductivity of Mn-Co and Cu-Mn spinel coatings and the matching of thermal expansion coefficient as well as the bonding of the coatings were reviewed. Element doping improved the conductivity of spinel coatings and increased the resistance to Cr poisoning to a certain extent, but there were still some issues required to be further resolved, such as the amount of element doping, the long-term stability of coating, etc. Finally, the problem of protective coatings for metal interconnects and the focus of future research work were prospected.