O<sub>2</sub>/CO<sub>2</sub>共存环境下缓蚀剂抑制碳钢腐蚀的机理研究

doi:10.11868/j.issn.1001-4381.2015.000439

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摘要

利用旋转圆盘电极（RDE）研究O₂/CO₂共存环境下，碳钢管线在不同浓度缓蚀剂中的腐蚀电化学行为。通过与CO₂环境中进行对比，研究得到O₂对缓蚀剂抑制碳钢CO₂腐蚀的影响。采用极化曲线测试不同浓度缓蚀剂下的缓蚀效率及阴、阳极行为，利用交流阻抗技术（EIS）监测缓蚀剂的吸附行为及腐蚀过程，并通过EIS拟合出的数据计算并绘制吸附等温线，利用扫描电镜观察含氧条件下的腐蚀形貌，利用XRD分析腐蚀产物膜的成分。结果表明：O₂导致缓蚀剂分子吸附能力减弱，在碳钢表面的吸附量减少，吸附膜覆盖度变小，缓蚀效率明显降低。同时，在有O₂环境下，腐蚀产物主要为疏松多孔的Fe₂O₃和FeO（OH）。由于含氧条件下腐蚀速率增大，腐蚀产物膜生成速率加快，导致缓蚀剂吸附能力进一步减弱，缓蚀剂有效作用时间变短。

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	王贝
	许立宁
	李东阳
	路民旭

关键词 ：碳钢, O₂/CO₂腐蚀, 缓蚀剂, 旋转圆盘电极, 吸附等温线, 腐蚀电化学

Abstract：

The electrochemical behavior of carbon steel pipeline in simulated solutions containing different concentrations of inhibitor saturated with O₂/CO₂ was studied by rotating disk electrode (RDE). After comparison with the results tested in CO₂ environment, the effect of O₂ on the inhibition performance of inhibitor A on the carbon steel was obtained.Potentiodynamic polarization was used to test the inhibition efficiency of inhibitor A. The EIS was used to study the adsorption behavior of the inhibitor and the corrosion process. The data calculated from the EIS fitting were used to study the adsorption behavior of the inhibitor. The morphology and the compositions of the corrosion product were observed by using SEM and XRD respectively. The results indicate that oxygen weakens the adsorption capacity of the inhibitor, which results in less adsorption film coverage ratio of the inhibitor on the steel surface and decreases corrosion inhibition efficiency. The corrosion products are loose and porous Fe₂O₃ and FeO(OH) in the environment of O₂ and CO₂ coexisting. The effective acting time of the inhibitor is shortened owing to the increasing corrosion rate and fast growth of the corrosion products in O₂/CO₂ environment, which results in more weakened adsorption capacity of the inhibitor.

Key words： carbon steel O₂/CO₂ corrosion inhibitor rotating disk electrode adsorption isotherm curve corrosion electrochemistry

收稿日期: 2015-04-20 出版日期: 2017-05-17

中图分类号:

TG174

基金资助:国家科技重大专项资助项目(2011ZX05056)

通讯作者: 许立宁 E-mail: xulining@ustb.edu.cn

作者简介: 许立宁(1976-), 男, 副教授, 博士, 研究方向为缓蚀剂, CO₂腐蚀及含Cr低合金钢的开发等, 联系地址:北京市海淀区学院路30号北京科技大学腐蚀楼208室(100083), E-mail:xulining@ustb.edu.cn

引用本文:

王贝, 许立宁, 李东阳, 路民旭. O₂/CO₂共存环境下缓蚀剂抑制碳钢腐蚀的机理研究[J]. 材料工程, 2017, 45(5): 38-45.
Bei WANG, Li-ning XU, Dong-yang LI, Min-xu LU. Corrosion Inhibition Mechanism of Carbon Steel in O₂/CO₂ Coexisting Environment. Journal of Materials Engineering, 2017, 45(5): 38-45.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.000439 或 http://jme.biam.ac.cn/CN/Y2017/V45/I5/38

Fig.1 缓蚀剂A主要成分

Table 1 X70钢的化学成分(质量分数/%)

Table 2 某气田采出液模拟溶液离子含量(mg·L^-1)

Fig.2 不同缓蚀剂浓度下的极化曲线 (a)CO₂环境；(b)O₂/CO₂环境

Table 3 纯CO₂及O₂/CO₂环境下自腐蚀电流密度和缓蚀效率

Fig.3 不同缓蚀剂浓度下的EIS结果 (a)CO₂环境；(b)O₂/CO₂环境

Table 4 CO₂环境下EIS结果拟合所得参数值

Table 5 O₂/CO₂环境下EIS结果拟合所得参数值

Fig.4 拟合EIS结果的等效电路图 (a)较低浓度缓蚀剂；(b)较高浓度缓蚀剂

Fig.5 缓蚀剂的吸附等温曲线

Fig.6 缓蚀剂分子吸附过程 (a), (b) CO₂环境；(c), (d) O₂/CO₂环境

Fig.7 不同时间下的EIS结果 (a)CO₂环境；(b)O₂/CO₂环境

Fig.8 O₂/CO₂环境下腐蚀产物膜XRD谱

Fig.9 O₂/CO₂环境下腐蚀产物膜微观形貌图 (a)截面形貌；(b)外层膜；(c)内层膜

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