Effects of Sodium Phosphate and Sodium Nitrite on the Pitting Corrosion Process of X70 Carbon Steel in Sodium Chloride Solution

被引：5

作者：

Zhu, Yongyan ^{[1
]}

Ding, Jiayi ^{[1
]}

Zhang, Jianli ^{[2
]}

Li, Liang ^{[1
]}

机构：

[1] Jiangsu Normal Univ, Sch Chem & Mat Sci, Jiangsu Key Lab Green Synthet Chem Funct Mat, Xuzhou 221116, Jiangsu, Peoples R China

[2] Jiangsu Zhongneng Silicon Ind Technol Dev Co Ltd, Xuzhou 221116, Jiangsu, Peoples R China

来源：

MATERIALS | 2020年 / 13卷 / 23期

基金：

中国国家自然科学基金;

关键词：

corrosion inhibitor; pitting corrosion; anodic dissolution; scanning electrochemical microscope (SECM); carbon steel; MILD-STEEL; LOCALIZED CORROSION; STAINLESS-STEEL; INHIBITION; MOLYBDATE; ANIONS; IRON; IONS; PROPAGATION; PASSIVITY;

D O I：

10.3390/ma13235392

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this paper, effects of sodium phosphate (Na3PO4) and sodium nitrite (NaNO2) on the pitting corrosion of X70 carbon steel in 0.10 mol/L NaCl solution were investigated by potentiodynamic polarization technique, electrochemical impedance spectroscopy (EIS) method, scanning electron microscope (SEM) and scanning electrochemical microscope (SECM). The SECM equipment was used to observe the dynamic processes of the pitting corrosion in situ. Na3PO4 or NaNO2 in the sodium chloride solution decreased the local anodic dissolution and increased the pitting resistance of the specimen. By analysis and comparison, it can be concluded that the inhibition effect of Na3PO4 is mainly due to the formation of a salt film, while the corrosion inhibition of NaNO2 is principally attributed to a protective oxide film on the electrode surface.

引用

页码：1 / 15

页数：15

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