Abstract

Microfabrication techniques and computational modeling were employed to examine the factors controlling the spatial distribution of crevice corrosion of 316L stainless steel in ferric chloride environments. Crevice fabrication consisted of a structural material surrounding a sacrificial material, the latter of which was selectively etched to form a rigorously defined hollow structure over the 316L substrate. For crevice gaps below 3 microns, the site of greatest attack down the crevice length was independent of gap size. A multivariable surface was used to model the variations in the electrochemical boundary condition as a function of chloride concentration. Modeling results predicted the location of greatest attack and that neither ohmic drop nor chemistry change models are suitable for austenitic stainless in acidic chloride environments. Instead, results showed that a chemistry dependent potential-current behavior is the factor that controls the spatial distribution of crevice corrosion attack in this system.

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