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Crevice corrosion of some ferritic stainless steels of low-interstitial content containing 2 percent molybdenum and chromium from 20 to 28 percent, and of 25Cr steels containing up to 5 percent molybdenum was studied using the potentiostatic polarization technique and a special cell developed at the laboratory. The crevice corrosion resistance in chloride containing media increased with increased chromium content at the same molybdenum level and with increased molybdenum content at the same chromium level. The 26Cr-1Mo steel was immune to crevice corrosion at room temperature. As the molybdenum content was increased, the immunity to crevice corrosion was extended to higher temperatures (up to 60 C), and also, as the chromium content was increased from 25 to 28 percent for the 2 percent molybdenum level, the immunity to crevice corrosion extended from room temperature to higher temperatures (up to 50 C).
corrosion, crevice corrosion, polarization, ferritic stainless steel, molybdenum, chromium, corrosion tests
Senior research associate, Climax Molybdenum Company of MichiganAmerican Metal Climax, Inc., Ann Arbor, Mich.