Effect of High Temperature Treatment on Aqueous Corrosion of Low-Carbon Steel by
Electrochemical Impedance Spectroscopy
Copyright © 2011 SciRes. MSA
86
surface developments of low-carbon steels, and pre-
sumably on all structural steels, is more complex than the
simple expectation of increased porous surface oxide
formation. For example, Bautista et al. [11], in a recent
study of the corrosion behavior of sintered ferritic stain-
less steels after high temperature (800˚C) treatment, re-
ported that while high temperature exposures resulted in
an increase in the corrosion current density for 11.3 wt.%
Cr ferritic stainless steel, a similar treatment for a 16.7
wt.% Cr stainless steel sample resulted in a decrease in
the corrosion current density as compared to the un-
treated samples.
These results clearly demonstrate that the exact influ-
ence of elevated temperatures on the corrosion behavior
of structural steels is still not fully understood. Perhaps, a
full understanding of temperature effects on the corrosion
behavior of structural materials in general lies in the
nanostructure developments that accompany such tem-
perature treatments, and other extreme conditions such as
pressure, fluids dynamics, irradiation, etc. The study of
the relationships between nanostructure developments of
these materials under extreme environments and at dif-
ferent temporal scales, deserve additional research em-
phasis. Unfortunately, a major factor militating against
such efforts is the lack of appropriate in-situ experimen-
tal techniques and adequate nanoscale analytical capa-
bilities that could facilitate such nanoscale studies on
structural steel materials.
5. Acknowledgements
The authors would like to acknowledge the financial
support of the Department of Energy-National Nuclear
Security Administration (DOE-NNSA) under the Samuel
Massie Chair of Excellence program.
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