Butt welded samples of various high molybdenum iron-base and nickel-base alloys which are candidates as materials of construction in SO2 scrubbers were exposed in a dynamically simulated calcium-base SO2 scrubber environment having 25000 mg/L chloride, 5000 mg/L fluoride at 60°C with the pH alternately cycled between 4.5 and 1.5 for 30 days and between 6.0 and 1.5 for an additional 30 days. Sulfur dioxide was bubbled continuously so as to produce fresh sulfurous acid. The base metal, welds and heat affected zones were examined after exposure, and even under these conditions show only modest attack for all alloys having 4% or more molybdenum. Cycling to higher pH induced scale deposition on the surface and increased attack on the samples.

Subject
Pits, Weld attack, Materials, Slurry, Metal surfaces, Molybdenum alloys, Scrubbers, Acidity, Base metals, Commercial alloys, Corrosion attacks, Pitting, Weld metal
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1984
Association for Materials Protection and Performance (AMPP)
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