Abstract Pitting behaviors of a low-alloy high strength steel in neutral 3.5 wt% NaCl solution were investigated by in situ laser confocal microscopy and scanning electron microscopy observations. The detailed pitting morphology evolutions with time are presented. Pitting initiation sites at the oxide, sulfide, and composite inclusions and pitting growing morphologies were observed. The relationship between the pit diameter, inclusion type, and area is illustrated. A mathematical model of the pitting growth kinetics surface was established based on the in situ measurements, and the changes in the pitting shape are well simulated. Finally, pitting initiation mechanisms for the three types of inclusions and a model for pitting process are proposed.

中文翻译：

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基于原位观察的低合金高强度钢在中性 3.5 wt% NaCl 溶液中的点蚀行为

摘要 通过原位激光共聚焦显微镜和扫描电子显微镜观察研究了低合金高强度钢在3.5 wt% NaCl中性溶液中的点蚀行为。详细的点蚀形态随时间演变。观察到氧化物、硫化物和复合夹杂物处的点蚀起始点和点蚀生长形态。说明了凹坑直径、夹杂物类型和面积之间的关系。基于原位测量建立了点蚀生长动力学表面的数学模型，并很好地模拟了点蚀形状的变化。最后，提出了三种夹杂物的点蚀引发机制和点蚀过程模型。