The effects of Ca++, Mg++, SO3=⁠, SO4= and F- ions and of coal flyash on the initiation of localized corrosion on nickel alloys 825, 904L, G and 625 were determined in simulated SO2 scrubber environments at pH 5.0 and 57°C (135°F). Sheet specimens were evaluated with multiple crevices produced by TFE fluorocarbon washers. Ca++ and Ca++ plus Mg++ ions produced less corrosive environments than the Na+ cation. Sulfuric acid produced a less severe acid/chloride environment than did sulfurous acid. The SO4= ion retarded crevice corrosion. Additions of coal flyash were found to inhibit corrosion of nickel alloys.

Subject
Ions, Corrosion resistant alloys, Fluorides, Corrosion rate, Nickel based alloys, Molybdenum alloys, Scrubbers, Sodium chloride, Acidity, Crevices, Crevice corrosion, Corrosion data, Chlorides
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1984
Association for Materials Protection and Performance (AMPP)
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