硫酸银对氯离子环境下Alloy690缓蚀特性的电化学分析

doi:10.3969/j.issn.0438-1157.2014.10.037

化工学报 ›› 2014, Vol. 65 ›› Issue (10): 4032-4038.DOI: 10.3969/j.issn.0438-1157.2014.10.037

硫酸银对氯离子环境下Alloy690缓蚀特性的电化学分析

胡军¹, 王赟¹, 余历军¹, 郑茂盛^1,2, 赵渊^1,2

1 西北大学化工学院, 陕西西安 710069;
2 西北大学载能技术与应用研究所, 陕西西安 710069

收稿日期:2014-01-22 修回日期:2014-03-25 出版日期:2014-10-05 发布日期:2014-10-05
通讯作者: 胡军
基金资助:
国家自然科学基金项目（51301132）；高等学校博士点基金项目（20136101120009）。

Electrochemical analysis of inhibition by silver sulfate for Alloy690 in chloride solution

HU Jun¹, WANG Yun¹, YU Lijun¹, ZHENG Maosheng^1,2, ZHAO Yuan^1,2

1 School of Chemical Engineering, Northwest University, Xi'an 710069, Shaanxi, China;
2 Institute of Energy Technology and Application, Northwest University, Xi'an 710069, Shaanxi, China

Received:2014-01-22 Revised:2014-03-25 Online:2014-10-05 Published:2014-10-05
Supported by:
supported by the National Natural Science Foundation of China (51301132) and the Research Fund for the Doctoral Program of Higher Education of China (20136101120009).

摘要/Abstract

摘要： 针对Alloy690在局部腐蚀过程中氯离子的自催化腐蚀作用，提出了利用Ag₂SO₄作为缓蚀剂防止氯离子对Alloy690的局部腐蚀。首先利用Tafel极化曲线和电化学阻抗谱，分析了将不同浓度的Ag₂SO₄加入到0.005 mol·L^-1的NaCl 溶液对Alloy690的缓蚀效率和表面结构的影响；然后通过X射线光电子能谱（XPS）对样品表面钝化膜的组成进行了分析，并与电化学阻抗谱分析结果进行了对比。研究结果表明：在Ag₂SO₄浓度较低时，它与氯离子形成络合物可有效降低腐蚀溶液中氯离子的活动性，并且这些络合物会覆盖在Alloy690表面，抑制了Alloy 690的阳极氧化过程，改变了电极表面双电层结构，有良好的缓蚀效果。

关键词: Alloy690, 腐蚀, 电解质, 界面, 缓蚀剂

Abstract: According to the self-catalytic effect of chloride ion in corrosion process, a new method based on Ag₂SO₄ as corrosion inhibitor was developed to reduce local corrosion. The corrosion inhibition effect of Ag₂SO₄ on Alloy690 was studied in 0.005 mol·L^-1 NaCl solution by using Tafel polarization curves, electrochemical impedance spectroscopy(EIS) and X-ray photoelectron spectroscopy(XPS). The corrosion current density was greatly decreased. This indicated that (AgCl₂)^- or (AgCl₃)^2- between silver ion and chloride ion were formed to decrease activity of chlorine ion in corrosion solution. The adsorption of the complex compound would change the double-layer structure from two layers to three layers, inhibiting the anodic oxidation process of Alloy690. With the increase of concentration of Ag₂SO₄, equilibrium potential would rise, and capacitance of the solid/liquid interface would decrease. Better inhibition effect than other cases could be achieved when the concentration of silver sulfate and sodium chloride ratio equaled to 0.2. Therefore, silver sulfate is a good corrosion inhibition for Alloy690 in chloride solution.

Key words: Alloy690, corrosion, electrolytes, interface, inhibitor

中图分类号:

TG174.3

胡军, 王赟, 余历军, 郑茂盛, 赵渊. 硫酸银对氯离子环境下Alloy690缓蚀特性的电化学分析[J]. 化工学报, 2014, 65(10): 4032-4038.

HU Jun, WANG Yun, YU Lijun, ZHENG Maosheng, ZHAO Yuan. Electrochemical analysis of inhibition by silver sulfate for Alloy690 in chloride solution[J]. CIESC Journal, 2014, 65(10): 4032-4038.

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硫酸银对氯离子环境下Alloy690缓蚀特性的电化学分析

Electrochemical analysis of inhibition by silver sulfate for Alloy690 in chloride solution

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