Controlled exposures to actual operating environments ranging from 1.4 to 9 5 in pH up to 5500 ppm chlorides and 176°F with strong chlorine base oxidizers present were made on 38 specimens of each of 26 materials, in order to determine their overall resistance to these environments. It was found that 8 materials, the two titanium alloys, ASTELLOY alloy C276, G and G3, INCONEL alloy 625, Carpenter 20-Mo6, and AL-29-4 were resistant to the full range of conditions. The austenitic alloys with higher nickel content were substantially more resistant to localized corrosion at both the 3 and 6% Mo levels. The good reproducibility of the crevice corrosion data developed in this program provides a unique body of data for studying the relative resistance of these alloys to crevice corrosion under these environmental conditions. The order in which these alloys resist initiation and propagation of crevice corrosion agrees reasonably well with the order in which Oldfield (1,2) found them to resist initiation based on laboratory tests.

Subject
Materials, Corrosion resistant alloys, Nickel based alloys, Molybdenum alloys, Corrosion initiation, Crevices, Corrosion attacks, Crevice corrosion, Corrosion data, Corrosion resistance, Localized corrosion, Titanium alloys, Alloys
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1984
Association for Materials Protection and Performance (AMPP)
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