A remote crevice assembly technique was employed to investigate the effects of environmental variations and alloy content on the crevice corrosion resistance of two austenitic and two ferritic stainless steels. Tests were conducted in pH=3 and pH=6 solutions containing 1,000 mg/L and 10,000 mg/L chloride at 30°C for a period of 40 days. Physically separated crevice members (anodes) of AISI Type 304, Type 316, Type 430 and 18Cr-2Mo stainless steel were electrically connected to larger cathode members of the respective alloys exposed to the same bulk environments. The selection of alloys allowed for comparisons between nickel-containing and nickel-free stainless steels having similar chromium and molybdenum contents. This test method allows for detection of changes in potential and current related to both initiation and subsequent propagation of crevice corrosion. Electrochemical data are compared with results obtained by more conventional methods. Scanning electron microscopy is used to describe differences in propagation behavior for the two classes of material.

Subject
Materials, Stainless alloys, Mass loss, Molybdenum alloys, Corrosion initiation, Crevices, Penetration, Corrosion propagation, Crevice corrosion, Stainless steel, Chlorides, Corrosion potential, Anodes
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1983
Association for Materials Protection and Performance (AMPP)
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