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

journal contribution
posted on 2009-01-01, 00:00 authored by J Han, N Nam, Y Jang, J Kim
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.

History

Journal

Journal of Korean Institute of Metals and Materials

Volume

47

Issue

9

Pagination

558 - 566

Publisher

Daehan Geumsog Jae'lyo Haghoe

Location

Seoul, Republic of Korea

ISSN

1738-8228

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2009, The Korean Institute of Metals and Materials

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