A novel type of iron conversion process has been recently developed to produce dense and adherent LaFeO₃ perovskite coatings onto ferritic stainless steel surfaces by reaction with La₂O₃ dissolved in specially‐formulated alkali molten carbonate baths. The major application of LaFeO₃ perovskite coatings is for use as electrically conductive and Cr barrier layers for enhancing the functional performance of solid oxide fuel cell (SOFC) stainless steel interconnects. An overview of the molten salt bath conversion process including the effect of chemical accelerants on structure and morphology of the deposited perovskite coatings is illustrated in this work. Latest results on SOFC coating functional properties obtained in recent European Union (EU) funded projects are also briefly mentioned. In particular, the tight correlation between coating thickness and electrical functional properties in terms of area specific resistance is highlighted here. Although thickness dependency may indicate a mediocre electrical conductivity of LaFeO₃ coatings produced by the conversion process, nonetheless very promising ASR results could be obtained in SOFC cathode environments at 700 °C with optimized coating structures and appropriate low coating thickness, thus suggesting a high potential of the conversion process for SOFC interconnect applications.

中文翻译：

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钙钛矿转化膜是改善铁素体不锈钢SOFC互连件功能性能的新颖而简单的方法

最近开发了一种新型的铁转化工艺，通过与溶解在特殊配方的碱式碳酸盐熔池中的La ₂ O ₃反应，在铁素体不锈钢表面上产生致密且附着的LaFeO ₃钙钛矿涂层。LaFeO ₃的主要应用钙钛矿涂料用作导电层和Cr阻挡层，以增强固体氧化物燃料电池（SOFC）不锈钢互连的功能性能。这项工作说明了熔盐浴转化过程的概况，包括化学促进剂对沉积钙钛矿涂层的结构和形态的影响。还简要提及了最近由欧盟（EU）资助的项目获得的有关SOFC涂层功能特性的最新结果。特别地，在此强调了涂层厚度和电功能特性之间就面积比电阻而言的紧密相关性。尽管厚度依赖性可能表明LaFeO _3的电导率中等 通过转化工艺生产的涂层，尽管如此，仍可以在700°C的SOFC阴极环境中以优化的涂层结构和适当的低涂层厚度获得非常有希望的ASR结果，因此表明转化工艺在SOFC互连应用中具有很高的潜力。