Journal
CORROSION SCIENCE
Volume 76, Issue -, Pages 390-402Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2013.07.012
Keywords
Superalloys; Molten salts; EIS; Polarization; SEM; Hot corrosion
Funding
- National Energy Technology Laboratory's Coal Utilization Science program [DE-FE0005717]
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Our newly developed high temperature electrochemical sensor was applied to study the effect of SO2 in flue gas on thin film coal ash corrosion of Inconel 740 superalloy at 750 degrees C. The response of electrochemical noise (EN), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP) test data from the sensor is compared with the results from a weight loss test. There is a good correlation between the electrochemical data and the actual degradation processes. The current noise analysis in time and frequency domains for the quantitative determination of hot corrosion rate in service is discussed. (C) 2013 Elsevier Ltd. All rights reserved.
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