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To investigate the effect of interaction between two single-Si 3 N 4  particle-impingements on the repassivation of 304 stainless steel in a simulated groundwater, the corrosion current peaks of the samples during the impingement were recorded, and the micro-hardness of the substrate around the crater was tested. The results indicated that significant interactions between the two impingements were observed only when the value of distance-diameter ratio ( L/d ) was less than 1.5. With  L/d  being less than 1.5, the corrosion current peaks and mass losses due to the second impingements were higher than those of the first ones, and the re-passivation rates of samples during the second impingements were lower than those of the first impingements. Simultaneously, the microhardness of the substrate between the two craters was higher than that of the surface around one single crater with the same distance-diameter ratio. The mechanisms of how the  L/d  ratio influenced the interaction between the two impingements are also discussed.

Effect of interaction between two single-particle-impingements on the repassivation behavior of 304 stainless steel in a simulated groundwater