1986 · 15 citations · 19 references
Natural SciencesMaterials EngineeringMaterials ScienceCorrosion ScienceMetallic MaterialsMetallurgyCorrosion EvaluationCorrosion MechanismsCorrosion Of SteelsCorrosion TestingCorrosion-resistant MaterialsStainless SteelsActive CorrosionCorrosion BehaviorCorrosion PotentialCorrosion Potential AnalysisFerritic Stainless SteelsPh-dependent Corrosion BehaviorStainless Steel CorrosionTitanium Alloys
Abstract Highly alloyed stainless steels can corrode at accelerated rates in crevices formed with less alloyed stainless steels when exposed to environments that would not be expected to degrade the former type of alloy. Laboratory and field tests were devised to evaluate the behavior of high-chromium ferritic stainless, AISI 300 and 400 series stainless, 6 wt pct molybdenum austenitic stainless, nickel base and titanium alloys in dissimilar metal crevices. Corrosion in dissimilar metal crevices was found in many instances to be more severe than attack in standard metal-to-nonmeta1 crevices. This corrosion behavior was related to the depassivation pH, active corrosion potential, corrosion rates and galvanic interaction of various alloys. A new method for evaluting the tendency of alloys to corrode in crevices is described.
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