| Electrochemical impedance models for molten salt corrosion | |
| C. L. Zeng; W. Wang; W. T. Wu | |
| 2001 | |
| Source Publication | Corrosion Science
 |
| ISSN | 0010-938X |
| Volume | 43Issue:4Pages:787-801 |
| Abstract | Taking into account the chemical stability and scaling features of metals, four electrochemical impedance models were proposed to represent their electrochemical impedance responses in molten-salt systems at the open-circuit potential. Electrochemical charge transfer for the non-active metals is the rate-limiting process. For the active metals, the transfer of ions in the scale and the diffusion of oxidants in melts become increasingly important as compared with the electrochemical process. When a non-protective scale forms on the metal surface, the impedance diagram may present the characteristics typical of a diffusion-controlled reaction. i.e.. a semi-circle at high frequency and a line at low frequency. When a protective scale forms on the metal surface, the Nyquist plot is composed of double capacitance loops, and the transfer of ions in the scale is rate limiting. An equivalent circuit of double layer capacitance in series with oxide capacitance can be used to represent this kind of impedance response. In the case of localized corrosion, the Nyquist plot also consists of double capacitance loops, which can be described by an equivalent circuit of double layer capacitance parallel to oxide capacitance. Impedance measurements of Pt. Ni3Al and FeAl intermetallics in molten-salt systems were conducted to verify the proposed impedance models. (C) 2001 Elsevier Science Ltd. All rights reserved. |
| description.department | chinese acad sci, inst corros & protect met, state key lab corros & protect, shenyang 110015, peoples r china.;zeng, cl (reprint author), chinese acad sci, inst corros & protect met, state key lab corros & protect, wencui rd 62, shenyang 110015, peoples r china |
| Keyword | Electrochemical Impedance Pt Molten-salt Corrosion Ni3al Feal Electrode Ni |
| URL | 查看原文 |
| WOS ID | WOS:000168028900013 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/36894 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | C. L. Zeng,W. Wang,W. T. Wu. Electrochemical impedance models for molten salt corrosion[J]. Corrosion Science,2001,43(4):787-801. |
| APA | C. L. Zeng,W. Wang,&W. T. Wu.(2001).Electrochemical impedance models for molten salt corrosion.Corrosion Science,43(4),787-801. |
| MLA | C. L. Zeng,et al."Electrochemical impedance models for molten salt corrosion".Corrosion Science 43.4(2001):787-801. |
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