Corrosion Product Formation Monitored Using the Feedback Mode of Scanning Electrochemical Microscopy with Carbon Microelectrodes

被引：12

作者：

Dauphin-Ducharme, Philippe ^{[1
]}

Kuss, Christian ^{[1
]}

Rossouw, David ^{[2
,3
]}

Payne, Nicholas A. ^{[1
]}

Danis, Laurence ^{[1
]}

Botton, Gianluigi A. ^{[2
,3
]}

Mauzeroll, Janine ^{[1
]}

机构：

[1] McGill Univ, Lab Electrochem React Imaging & Detect Biol Syst, Montreal, PQ H3A 0B8, Canada

[2] McMaster Univ, Dept Mat Sci & Engn, Brockhouse Inst Mat Res, Hamilton, ON L8S 4M1, Canada

[3] McMaster Univ, Canadian Ctr Electron Microscopy, Hamilton, ON L8S 4M1, Canada

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2015年 / 162卷 / 12期

基金：

加拿大自然科学与工程研究理事会;

关键词：

MAGNESIUM ALLOYS; HYDROGEN; SECM; KINETICS; MG2+; RESISTANCE; PLATINUM; ALUMINUM; OXYGEN; FILM;

D O I：

10.1149/2.0701512jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

When studying magnesium alloy corrosion, the quantitative analysis of probe approach curves acquired in the feedback mode of scanning electrochemical microscopy is particularly challenging. The oxidation current of the ferrocenemethanol mediator recorded at conventional Pt microelectrodes is systematically plagued by parasitic faradaic contribution from the oxidation hydrogen. Herein we demonstrate the use of carbon microelectrodes to remove this unwanted faradaic contribution, allowing for in situ time lapse monitoring of the corrosion product layer growth. Applying a one-dimensional diffusion approximation, the extracted rate constants obtained by scanning electrochemical microscopy probe approach curves could be correlated to the corrosion product film thickness and porosity obtained by transmission electron microscopy. The Author(s) 2015. Published by ECS. All rights reserved.

引用

页码：C677 / C683

页数：7

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