Field tests using specimen racks were performed in six operating flue gas desulfurization (FGD) scrubber absorbers to determine the corrosion resistance of a 22Cr-5Ni duplex alloy, a 4% Mo-containing (Type 317LMN) stainless steel, and a 6% Mo-containing stainless steel. Type 316 stainless steel and alloy C-276 specimens served as highly-susceptible and highly-resistant controls, respectively. The chloride levels in the six absorber slurry environments ranged from ~9000 to ~70,000 ppm. The pH was typically ~5.5 with the slurry temperature in the 120 - 154°F (~49-68°C) range. Duplicate specimens were tested with “loose” and “tight” crevices for two exposure periods.

Subject
Slurry, Stainless alloys, Flue gas desulfurization, Crevices, Corrosion attacks, Corrosion scales, Crevice corrosion, Corrosion resistance, Localized corrosion, Stainless steel, Alloys, Chlorides, Test specimen
Keywords:
Stainless steels, alloy C-276, corrosion, FGD absorber, limestone slurry, field testing
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2000
Association for Materials Protection and Performance (AMPP)
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