Quantitative analysis of the polarization behavior of iron in an aerated acidic solution using SECM

被引：12

作者：

Zhang, Qinhao ^{[1
]}

Liu, Pan ^{[1
]}

Zhu, Zejie ^{[1
]}

Ye, Zhenni ^{[1
]}

Zhang, Jianqing ^{[1
]}

Cao, Fahe ^{[1
]}

Li, Xiaogang ^{[2
]}

机构：

[1] Zhejiang Univ, Dept Chem, Hangzhou 310027, Zhejiang, Peoples R China

[2] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2018年 / 93卷

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

Polarization behavior; Iron; Acidic solution; SECM; SCANNING ELECTROCHEMICAL MICROSCOPY; LOCALIZED CORROSION; IMPEDANCE SPECTROSCOPY; ELECTRODE TECHNIQUE; ANODIC-DISSOLUTION; CHLORIDE SOLUTION; NOISE-ANALYSIS; SURFACE; STEEL; PH;

D O I：

10.1016/j.elecom.2018.07.007

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The apparent corrosion current of pure iron in aerated 5 mM HClO4 + 0.1 M NaClO4 solution was separated into Fe oxidation, proton reduction and oxygen reduction currents using SECM in a modified tip generation/substrate collection (TG/SC) mode. The oxidation current density of Fe was 1.11 x 10(-3) A/cm(2), equal to the sum of proton reduction and oxygen reduction current density, around 5.26 x 10(-4) and 5.84 x 10(-4) A/cm(2), respectively, implying that oxygen reduction and proton reduction are equally important at open circuit potential (OCP). Moreover, oxygen reduction was suppressed on the Fe electrode in the potential range between -0.7 and -1.1 V vs Ag/AgCl because of the inhibitory effect of the proton reduction reaction and a potential-dependent surface effect, then the suppression is weakened and oxygen reduction is enhanced. Finally, the Fe corrosion current was dominated by oxygen reduction and Fe oxidation at potentials more positive than -0.6 V.

引用

页码：143 / 147

页数：5

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