Laboratory tests were conducted to evaluate the performance of several inhibitors on the corrosion behavior of 1020 carbon steel, Type 316L stainless steel, alloy G-3 and Grade-2 titanium in a pilot flue gas desulfurization (FGD) limestone scrubber. Replicate coupon and U-bend specimens of the three passive alloys were exposed in the absorber; and replicate specimens of all four alloys were exposed in the outlet duct pre-reheat and postreheat test zones. In most cases, 1,000 ppm inhibitor was introduced into the slurry at the start of each test; however, in one case, inhibitor was also continuously injected directly into the outlet duct. The effects of inhibitors on corrosion behavior were evaluated in terms of mass loss for carbon steel and depths of bold surface pitting and crevice attack for the passive alloys. Electrochemical measurements were performed on all four alloys in the outlet duct condensate and slurry environments. Inhibitor effects on SO2 removal efficiency were also noted.

Subject
Inhibitor performance, Slurry, Stainless alloys, Flue gas desulfurization, Scrubbers, Condensates, Corrosion attacks, Amines, Crevice corrosion, Corrosion inhibitors, Titanium, Carbon steel, Stainless steel
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1987
Association for Materials Protection and Performance (AMPP)
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