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Comparative study of ni effect on the corrosion behavior of low alloy steels in FGD and acid rain environments

Han, J. H., Nam, N. D., Jang, Y. W. and Kim, J. G. 2009, Comparative study of ni effect on the corrosion behavior of low alloy steels in FGD and acid rain environments, Journal of Korean Institute of Metals and Materials, vol. 47, no. 9, pp. 558-566.

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Title Comparative study of ni effect on the corrosion behavior of low alloy steels in FGD and acid rain environments
Author(s) Han, J. H.
Nam, N. D.
Jang, Y. W.
Kim, J. G.
Journal name Journal of Korean Institute of Metals and Materials
Volume number 47
Issue number 9
Start page 558
End page 566
Total pages 9
Publisher Daehan Geumsog Jae'lyo Haghoe
Place of publication Seoul, Republic of Korea
Publication date 2009
ISSN 1738-8228
Keyword(s) acid rain environment
EIS
FGD environment
low alloy steel
Ni effect
potenticdynamic test
potentiostatic test
Summary The alloying effect of a small amount of nickel on low alloy steel for application to flue gas desulfurization(FGD) systems was studied. The structural characteristics of the rust layer were investigated by scanning electron microscopy(SEM). The electrochemical properties were examined by means of potentiostatic polarization test, potentiodynamic polarization test, and electrochemical impedance spectroscopy(EIS) in a modified green death solution of 16.9 vol.% H2SO4+0.35 vol.% HC1 at 60°C and an acid rain solution of 6.25 X 10-5 M H2S04+5.5 X 10-3 M NaCl at room temperature. It was found that as the amount of nickel increased, the corrosion rate increased in the modified green death solution, which seemed to result from micro-galvanic corrosion between NiS and alloy matrix. In acid rain solution, the corrosion rate decreased as the amount of nickel increased due to the repulsive force of NiFe204 rust against Cl-ions by electronegativity.
Language eng
Field of Research 099999 Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2009, The Korean Institute of Metals and Materials
Persistent URL http://hdl.handle.net/10536/DRO/DU:30048026

Document type: Journal Article
Collections: School of Engineering and Technology
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