超微电极
扫描电化学显微镜
电位滴定法
安培法
电解质
基质(水族馆)
化学
阳极
微电极
电极
电化学
分析化学(期刊)
腐蚀
材料科学
循环伏安法
色谱法
物理化学
海洋学
有机化学
地质学
作者
Zejie Zhu,Zhenni Ye,Qin-Hao Zhang,Jianqing Zhang,Fahe Cao
标识
DOI:10.1016/j.elecom.2018.01.018
摘要
Potentiometric Scanning Electrochemical Microscopy (SECM) allows the pH distribution at electrode/electrolyte interfaces to be mapped at the micrometer and submicrometer scale using ion-selective ultramicroelectrodes (UMEs) as scanning probes. However, this technique lacks precise control of the tip-to-substrate distance. Herein we propose a novel dual Pt-Pt/IrOx UME for local in situ pH visualization of 316L stainless steel (316L-SS) corrosion processes with precise tip–substrate distance control using both amperometric and potentiometric SECM modes. Simulations based on COMSOL and experimental approach curves obtained with this dual UME configuration are used to precisely establish the tip–substrate distance. Higher pH values were observed for smaller tip–substrate separations when this probe configuration is used with bulk electrolyte of the same pH. Furthermore, during the corrosion process local anodic and cathodic zones were observed to form, disappear and regenerate at a vertical tip–substrate distance of 12 μm as a result of the localized corrosion and repassivation of 316L-SS.
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