The resistance of commercial and laboratory produced stainless steels to crevice corrosion was evaluated by a 60 day exposure in filtered seawater at 25°C. The results in seawater were compared to laboratory tests in 10% FeCl3. Austenitic ferritic, and duplex stainless steels containing a minimum of 25%Cr-5%Mo, 27%Cr-3.4%Mo and 25%Cr-3.2%Mo, respectively, were found to be resistant to crevice corrosion in 25°C seawater. The austenitic stainless steels also required a minimum of 0.2%N. Significant reductions in either the chromium or molybdenum content resulted in substantial amounts of attack. There was a good correlation between the laboratory tests in 10% FeCl3 and the seawater test for the ferritic and duplex stainless steels but not for the austenitic grades.

Subject
Molybdenum, Chromium, Seawater, Crevices, Corrosion attacks, Nitrogen, Crevice corrosion, Steel, Corrosion resistance, Duplex stainless steel, Stainless steel, Ferrite, Austenite
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1985
Association for Materials Protection and Performance (AMPP)
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