Several nickel alloys were tested in actual SO2 scrubbers and in the laboratory. The alloys, including INCOLOY alloy 825, HUNTINGTON alloy 904L, HUNTINGTON alloy G, and INCONEL alloy 625, were exposed to scrubber slurries at pH 1 to 8, chloride concentrations up to 150,000 ppm, and temperatures from 125° to 175°F (50° to 80°C). Localized (crevice or pitting) corrosion, the primary mode of attack, was accelerated as temperatures and levels of chlorides increased. The most severe corrosion occurred at low pH and high levels of chlorides. Controlling the pH at 5 to 6 and maintaining the temperature at 135°F (55°C) in the absorber provided greater tolerance to "excursions" in chloride levels. The corrosion resistance of the nickel alloys was also related to the level of molybdenum they contain. Welding with high-Mo INCONEL Welding Electrode 112 did not adversely affect the corrosion resistance of the alloys in the various simulations of high-chloride scrubbers.

Subject
Slurry, Corrosion resistant alloys, Stainless alloys, Laboratory data, Nickel based alloys, Molybdenum alloys, Welding, Scrubbers, Commercial alloys, Environments, Corrosion resistance, Localized corrosion, Chlorides
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1982
Association for Materials Protection and Performance (AMPP)
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