Techniques presently exist for ranking of alloys for crevice corrosion resistance by determining their Critical Crevice Temperature (CCT) in 6 to 10% FeCl3 environments. Laboratory studies were conducted on nickel alloys to evaluate the effect of FeCl3 concentration and test procedure on CCT results. A modified test procedure was developed which yields more reproducible results with less data scatter than incurred with existing techniques. The severity of the environment increased with increasing FeCl3 content from 6 to 10%. CCT results correlated to alloy Cr, Mo, Cb and W content.

Subject
Materials, Corrosion resistant alloys, Stainless alloys, Nickel based alloys, Molybdenum alloys, Alloying elements, Commercial alloys, Crevices, Scatter, Crevice corrosion, Heat, Corrosion resistance, Chlorides
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1986
Association for Materials Protection and Performance (AMPP)
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