期刊
JOURNAL OF POWER SOURCES
卷 261, 期 -, 页码 162-169出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.03.076
关键词
Stainless steel; Molten salts; Intermetallics; Electrochemical impedance spectroscopy; Hot corrosion
资金
- National Natural Science Foundation of China [51371183, 50971129]
An arc ion plating (AIP) was used to fabricate a FeAl layer on 310S stainless steel to protect the sealing area being corroded by the molten carbonate in molten carbonate fuel cells (MCFCs). The degradation of aluminide coatings comes from both the corrosion of the coating in contact with the molten carbonate and the aluminium depletion due to the interdiffusion of aluminium and the substrate. The in-situ forming of aluminide in molten carbonate at 650 C could be a possible way to reduce the inward diffusion of aluminium in the conventional pre-annealing at 850 degrees C. Electrochemical impedance spectroscopy (EIS) measurements were performed to model the corrosion of this pre-formed FeAl coating in comparison with the one formed in-situ in molten (0.62 Li+038 K)(2)CO3 at 650 degrees C. Although alpha-LiAlO2 is the corrosion product in both cases, the impedance spectra show distinct rate-limiting steps; the former is controlled by the charged particles passing through the scale, while the latter by their diffusion in the melt. The microstructure of the scale might be the reason for the difference in corrosion mechanism. (C) 2014 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据