Characterization of hot corrosion of Fe-20Cr coated with a fused (Na,K)(2)SO4 film by electrochemical impedance spectroscopy
文献类型：期刊论文
| 作者 | C. L. Zeng ; J. Li ; G. M. Liu |
| 刊名 | High Temperature Materials and Processes
 |
| 出版日期 | 2007 |
| 卷号 | 26期号:3页码:167-176 |
| 关键词 | Fe-20Cr alloy (Na K)(2)SO4 hot corrosion electrochemical impedance spectroscopy molten sodium-sulfate salt corrosion na2so4 film degrees-c carbonate ni oxygen 0.38k)(2)co3 reduction mechanism |
| ISSN号 | 0334-6455 |
| 中文摘要 | Electrochemical studies of hot corrosion were conducted mostly in deep molten salts, which are not identical to a fused salt film in service conditions. In order to establish electrochemical measurements under a fused salt film, a two-electrode probe was proposed for electrochemical impedance studies of hot corrosion of Fe-20Cr alloy induced by a fused 0.9Na(2)SO(4)-0.1K(2)SO(4) (mole fraction) film at 1173K in air. The corrosion of the alloy was characterized by an initial incubation stage with a relatively low corrosion rate and a later stage with rapid material degradation, accompanied with quite different impedance features. In the initial stage, the alloy formed a protective Cr-rich oxide scale, and the corresponding impedance spectra were composed of two capacitive loops. With extended exposure, the electrochemical impedance spectra showed the typical characteristics of a diffusion-controlled reaction, which-was associated with the degradation of Cr-rich scale and the formation of a no-protective mixed scale of oxides and sulfides owing to fluxing of oxide scale as well as internal sulfidation of Cr. Two equivalent circuits were proposed to fit the impedance spectra in two stages. Based on the transport of molecular O-2 in the melt, Warburg impedance was introduced to calculate the product (C-O2 root D-O2) of solubility and diffusion coefficient for oxygen in the melt, and the main reduction reaction was also discussed. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/34014]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | C. L. Zeng,J. Li,G. M. Liu. Characterization of hot corrosion of Fe-20Cr coated with a fused (Na,K)(2)SO4 film by electrochemical impedance spectroscopy[J]. High Temperature Materials and Processes,2007,26(3):167-176. |
| APA | C. L. Zeng,J. Li,&G. M. Liu.(2007).Characterization of hot corrosion of Fe-20Cr coated with a fused (Na,K)(2)SO4 film by electrochemical impedance spectroscopy.High Temperature Materials and Processes,26(3),167-176. |
| MLA | C. L. Zeng,et al."Characterization of hot corrosion of Fe-20Cr coated with a fused (Na,K)(2)SO4 film by electrochemical impedance spectroscopy".High Temperature Materials and Processes 26.3(2007):167-176. |
入库方式： OAI收割
来源：金属研究所
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