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Potentiodynamic Corrosion Testing

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使用扫描电化学细胞显微镜在不钢中选择性启动腐蚀坑

Lindsay Grandy¹, Sarah R Yassine¹, Robert Lacasse²

¹Department of Chemistry, McGill University, 845 Sherbrooke St W, Montréal, Québec H3A 0G4,Canada.

Analytical chemistry

|May 2, 2024

概括

扫描电化学细胞显微镜 (SECCM) 揭示了实验参数如何影响不钢腐蚀. 控制SECCM参数允许详细研究被动化和坑,增强对腐蚀机制的理解.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
腐蚀科学腐蚀科学

背景情况:

扫描电化学细胞显微镜 (SECCM) 对表面腐蚀分析非常有价值.
在SECCM实验参数的变化阻碍了研究间结果的比较.
了解对腐蚀系统的参数影响对于可靠的数据至关重要.

研究的目的:

调查SECCM实验参数如何影响马氏体不钢的腐蚀行为.
使用SECCM探索氧化物被动化动力学和单个坑事件的控制.
为了确定 Al2O3 入启动地点的组成变化.

主要方法:

使用扫描电化学细胞显微镜 (SECCM) 在造CA6NM和造S41500马氏体不钢上.
多种实验参数:扫描速率,接近潜力,表面油浸和尖端光圈直径.
测量了个别坑的插入和复原动力学,并分析了初始点的组成变化.

主要成果:

证明 SECCM 的参数可以调整为探测氧化物被动化和化.
在表面状态和阴极电流中发现的变化影响了腐蚀行为.
收集了大量的数据 (在17小时内收集了数百个点) 用于对腐蚀和孔值进行统计分析.

结论:

在SECCM中的实验参数显著影响了不钢的观察到的腐蚀行为.
经过控制的SECCM实验,可以对被动化和孔机制进行细致的微观分析.
这项工作促进了对腐蚀研究的微调,促进了对材料降解过程的理解.

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