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.

中文翻译：

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两种单粒子撞击之间的相互作用对304不锈钢在模拟地下水中的再钝化行为的影响

为了研究两种单硅3 N 4粒子撞击之间的相互作用对模拟地下水中304不锈钢的再钝化的影响，记录了撞击过程中样品的腐蚀电流峰值，以及基底的显微硬度。火山口周围已经过测试。结果表明，仅当距离直径比（L / d）小于1.5时，才观察到两个碰撞之间的显着相互作用。当L / d小于1.5时，第二次撞击导致的腐蚀电流峰值和质量损失高于第一次撞击，样品在第二次撞击中的再钝化率低于第一次撞击。同时，在相同的距离直径比的情况下，两个凹坑之间的基底的显微硬度高于一个凹坑周围的表面的显微硬度。还讨论了L / d比如何影响两个碰撞之间相互作用的机制。