Tong Wei, Wang Weiqiang, Leng Xiayu, Song Jianli
School of Instrument Science and Opto-Electronic Engineering, Beijing Information Science and Technology University, Beijing 100192, China.
Materials (Basel). 2024 Mar 5;17(5):1200. doi: 10.3390/ma17051200.
To enhance the comprehensive performance of solid oxide fuel cells (SOFCs) ferritic stainless steel (FSS) interconnectors, a novel approach involving composite electrodeposition and thermal conversion is proposed to prepare Ni-doped Co-Mn composite spinel protective coatings on FSS surfaces. The process involves the composite electrodeposition of a Ni-doped Co-Mn precursor coating, followed by thermal conversion to obtain the Co-Mn-Ni composite spinel coating. Crofer 22H was used as the substrate and orthogonal experiments were designed to investigate the influences of deposition solution pH, stirring rate, cathode current density, and the element content of Mn and Ni on the surface morphology and properties of the composite coatings, respectively. The characterization of the prepared coatings was conducted through macroscopic and microscopic morphology observations of the component surface, energy dispersive spectroscopy (EDS) analysis, and area specific resistance (ASR) testing, etc. Finally, the optimized composite electrodeposition parameters and the Mn-Ni content ratio in the solution were obtained. Experimental results indicated that the composite spinel coating prepared with the optimized process parameters exhibited excellent adhesion to the substrate, and the diffusion and migration of Cr element has been effectively inhibited. Compared with the substrate, the ASR of the coated components has also been decreased simultaneously, which provided an effective method for the surface modification of SOFC FSS interconnectors.
为提高固体氧化物燃料电池（SOFC）铁素体不锈钢（FSS）互连件的综合性能，提出一种涉及复合电沉积和热转化的新方法，以在FSS表面制备掺镍Co-Mn复合尖晶石保护涂层。该工艺包括复合电沉积掺镍Co-Mn前驱体涂层，然后进行热转化以获得Co-Mn-Ni复合尖晶石涂层。采用Crofer 22H作为基体，并设计正交实验分别研究沉积溶液pH值、搅拌速率、阴极电流密度以及Mn和Ni元素含量对复合涂层表面形貌和性能的影响。通过对涂层表面进行宏观和微观形貌观察、能谱（EDS）分析以及面积比电阻（ASR）测试等对制备的涂层进行表征。最终得到了优化的复合电沉积参数以及溶液中的Mn-Ni含量比。实验结果表明，采用优化工艺参数制备的复合尖晶石涂层与基体具有优异的附着力，并且有效抑制了Cr元素的扩散和迁移。与基体相比，涂层部件的ASR也同时降低，这为SOFC FSS互连件的表面改性提供了一种有效方法。
