Crevice pit propagation studies were conducted on nickel alloys 825, 904L, and 625 in a simulated SO2 scrubber environment at pH 5 and 57 °C (135 °F) involving exposures to 360 days. Plate specimens with alloy 625 composition welds were evaluated with crevices produced by fluorocarbon o-rings. At low chloride levels, near the minimum chloride content for crevice pit initiation for each alloy, crevice pits which initiated, failed to propagate further with additional exposure time. The critical chloride level necessary for continued propagation of crevice pits is far above the minimum chloride level for crevice pit initiation for each alloy.

Subject
Pits, Weld attack, Pit propagation, Nickel based alloys, Scrubbers, Corrosion initiation, Base metals, Commercial alloys, Crevices, Crevice corrosion, Specimen preparation, Alloys, Chlorides
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1986
Association for Materials Protection and Performance (AMPP)
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