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High Temperature Materials and Processes

Editor-in-Chief: Fukuyama, Hiroyuki

Editorial Board: Waseda, Yoshio / Fecht, Hans-Jörg / Reddy, Ramana G. / Manna, Indranil / Nakajima, Hideo / Nakamura, Takashi / Okabe, Toru / Ostrovski, Oleg / Pericleous, Koulis / Seetharaman, Seshadri / Straumal, Boris / Suzuki, Shigeru / Tanaka, Toshihiro / Terzieff, Peter / Uda, Satoshi / Urban, Knut / Baron, Michel / Besterci, Michael / Byakova, Alexandra V. / Gao, Wei / Glaeser, Andreas / Gzesik, Z. / Hosson, Jeff / Masanori, Iwase / Jacob, Kallarackel Thomas / Kipouros, Georges / Kuznezov, Fedor


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Open Access
Online
ISSN
2191-0324
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Volume 30, Issue 1-2

Issues

Electrochemical-Impedance-Spectroscopy Study of Corrosion of the Alloy NF616 with Molten ZnCl2-KCl Coating in Air at 673 K

T. J. Pan
  • Corresponding author
  • School of Materials Science and Engineering, and Key Laboratory of Advanced Metallic Materials of Changzhou City, Changzhou University, China
  • Wei Hua Precision Alloy Co., Ltd. Jiangsu, Lu Town Industrial Park, Danyang City, China
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  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ W. L. Xue
  • School of Materials Science and Engineering, and Key Laboratory of Advanced Metallic Materials of Changzhou City, Changzhou University, China
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  • De Gruyter OnlineGoogle Scholar
/ D. G. Chen
  • School of Materials Science and Engineering, and Key Laboratory of Advanced Metallic Materials of Changzhou City, Changzhou University, China
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ J. Hu
  • School of Materials Science and Engineering, and Key Laboratory of Advanced Metallic Materials of Changzhou City, Changzhou University, China
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Published Online: 2011-04-19 | DOI: https://doi.org/10.1515/htmp.2011.009

Abstract

The corrosion behavior of the alloy NF616 covered with a film of molten 0.55ZnCl2-0.45KCl (mole fraction), similar to that found in waste incineration plants, was examined in air at 673 K by the electrochemical-impedance spectroscopy (EIS) technique. For comparison, the corrosion of the same material immersed in the deep salt was also studied. The electrochemical impedance spectra for the corrosion of NF616 beneath a film of fused salt consisted of a semi-circle at high-frequency port and a line at low-frequency port indicating a diffusion-controlled reaction. Contrary to the corrosion beneath salt film, the corrosion of the alloy in deep molten salt presented the characteristics of two capacitive loops during all the duration of the experimental test. This different EIS features under two corrosion conditions may be related to the different supply of oxygen amount. In this paper, suitable equivalent circuits representing the corrosion of the alloy under the two different corrosion conditions are proposed to fit the corresponding impedance spectra and electrochemical parameters in the equivalent circuits are also calculated.

Keywords.: NF616; ZnCl2-KCl; impedance models; electrochemical impedance

About the article

Corresponding author: T. J. Pan, School of Materials Science and Engineering, Changzhou University, Changzhou City, 213164, China


Received: 2010-08-02

Accepted: 2010-08-27

Published Online: 2011-04-19

Published in Print: 2011-04-01


Citation Information: High Temperature Materials and Processes, Volume 30, Issue 1-2, Pages 71–75, ISSN (Online) 2191-0324, ISSN (Print) 0334-6455, DOI: https://doi.org/10.1515/htmp.2011.009.

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