Abstract
A novel technique has been developed to examine the details of the slurry erosion–corrosion behaviour of stainless steel in aqueous silica slurry using a modified slurry erosion rig with a two-electrode system. Measurement of current transients of 304L stainless steel in chloride solution shows the propagation of metastable pits immediately after a short duration of erosive particle impingement below the pitting potential. Metastable pit events after the particle impingement are more numerous than those under non-erosive conditions. Erosive impact by solid particles thus stimulates pitting corrosion of stainless steel in chloride solution by nucleation of more metastable pits. It is argued that the effect arises both from exposure of fresh active sites during erosion as well as by altering their geometry.
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