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Corrosion Product Identification by Micro-Raman and Mossbauer Spectroscopy

Published online by Cambridge University Press:  02 July 2020

F. Adar ,
B. Lenain ,
D. C. Cook  and
S. J. Oh
F. Adar
Affiliation:
Instruments S.A. Inc., Edison, New Jersey, 08820U.S.A.
B. Lenain
Affiliation:
Instruments S.A. Inc., Edison, New Jersey, 08820U.S.A.
D. C. Cook
Affiliation:
Department of Physics, Old Dominion University, Norfolk, Virginia, 23529U.S.A.
S. J. Oh
Affiliation:
Department of Physics, Old Dominion University, Norfolk, Virginia, 23529U.S.A.
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Extract

Micro-Raman spectrometry and Mossbauer spectroscopy have been used to identify the corrosion products on a steel coupon exposed in an industrial environment for 16 years. The Raman analysis was performed on a polished metallographic cross-section in order to map the oxides across the thickness of the coating. The spectra were recorded using a LabRam Micro-Raman spectrograph incorporating a 17 mW HeNe laser (attenuated to 1 mW to prevent oxide transformation), focused to 1 μm spot size, and 1800 g/mm grating. The confocal line-scan imaging enabled 100 spectra to be recorded in one scan at 0.5 um intervals across the thickness of the coating. The Mossbauer analysis was performed using in-situ scattering Mossbauer spectroscopy on the attached corrosion coating and transmission Mossbauer spectroscopy at 300K and 77K on the removed coating, to measure the fraction of each oxide present. Micro-Raman spectrometry showed that the corrosion products had formed in distinct layers as shown in Figure 1.

Type
Microscopy and Microanalysis in the “Real World”
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 506 - 507
Copyright
Copyright © Microscopy Society of America

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References

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