Scanning electrochemical cell microscopy is a useful technique for determining variations in corrosion behavior across a surface. However, the numerous options for experimental parameters and little understanding of their effect on the corroding system render comparisons of results between studies difficult. Herein, we explore changes in corrosion behavior of two martensitic stainless steels, a cast CA6NM and a wrought S41500, as a result of the chosen experimental parameters, including scan rate, approach potential, surface oil immersion, and tip aperture diameter. The study demonstrates that these experimental parameters can be controlled to probe oxide passivation kinetics and single pitting events by changing the surface state and cathodic currents. We measured the pitting and repassivation kinetics of a single pit and determined the compositional change of the Al₂O₃ inclusion site initiation point. Hundreds of data points were measured within 17 h of experimental time on the stainless steel samples, allowing statistical averages of corrosion and pitting values. This work will open new avenues for fine-tuning various corrosion aspects at the microscale, thereby contributing to a deeper understanding of the corrosion processes and mechanisms of diverse materials.

中文翻译：

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使用扫描电化学电池显微镜选择性引发不锈钢中的腐蚀坑


扫描电化学电池显微镜是确定整个表面腐蚀行为变化的有用技术。然而，实验参数的众多选择以及对其对腐蚀系统的影响知之甚少，使得研究之间的结果比较变得困难。在此，我们探讨了两种马氏体不锈钢（铸造 CA6NM 和锻造 S41500）的腐蚀行为因所选实验参数（包括扫描速率、接近电位、表面油浸度和尖端孔径直径）而发生的变化。研究表明，可以通过改变表面状态和阴极电流来控制这些实验参数，以探测氧化物钝化动力学和单点蚀事件。我们测量了单个凹坑的点蚀和再钝化动力学，并确定了 Al ₂ O ₃ 夹杂物位点起始点的成分变化。在 17 小时的实验时间内，对不锈钢样品测量了数百个数据点，从而获得了腐蚀和点蚀值的统计平均值。这项工作将为在微观尺度上微调各种腐蚀方面开辟新途径，从而有助于更深入地了解不同材料的腐蚀过程和机制。