Evaluation of high Ni-Cr-Mo alloys for the construction of sulfur dioxide scrubber plants |
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Authors: | N Rajendran S Rajeswari |
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Affiliation: | (1) Department of Analytical Chemistry, University of Madras, Guindy Campus, 600 025 Madras, India |
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Abstract: | Corrosion in wet lime/limestone systems used for flue gas desulfurization in thermal power plants is of great concern. The
frequent variations in acidity and in chloride and fluoride ion concentrations experienced by such systems pose a serious
threat to the materials of construction. Currently used materials mostly type 316L stainless steel often fail to meet their
life expectancy. The present study evaluates the performance of advanced Ni- Cr- Mo alloys 59 and C- 276 in a simulated sulfur
dioxide scrubber environment. Accelerated tests showed that high Ni- Cr- Mo alloys have little tendency to leach metal ions
such as chromium, nickel, and molybdenum at different impressed potentials. Scanning electron microscopy was used to examine
the morphology of pitting attack. |
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Keywords: | accelerated leaching Alloy 59 Alloy C-276 flue gas desulfurization Ni-Cr-Mo alloys pitting corrosion |
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