X80管线钢红壤腐蚀初期电化学行为

doi:10.11902/1005.4537.2014.171

中国腐蚀与防护学报

2014, Vol. 34

Issue (5): 472-476 DOI: 10.11902/1005.4537.2014.171

本期目录 | 过刊浏览

X80管线钢红壤腐蚀初期电化学行为

么惠平¹, 闫茂成²(

), 杨旭¹, 孙成²

1. 中国石油西南管道公司南宁输油气分公司南宁 530000
2. 中国科学院金属研究所国家金属腐蚀控制工程技术研究中心沈阳 110016

Electrochemical Behavior of X80 Pipeline Steel in the Initial Stage of Corrosion in an Acidic Red Soil

YAO Huiping¹, YAN Maocheng²(

), YANG Xu¹, SUN Cheng²

1. Nanning Oil and Gas Branch, Petrochina Southwest Pipeline Company, Nanning 53000, China
2. National Engineering Center for Corrosion Control, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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摘要:

通过室内土壤埋样实验,采用电化学阻抗谱 (EIS) 和极化技术研究了X80管线钢在红壤泥浆中的早期腐蚀行为。结果表明,X80管线钢在水饱和红壤中腐蚀初期 (15 d内) 的EIS具有两个时间常数特征,高频端呈现土壤介质特征容抗弧,10^-²~10⁴ Hz频区为腐蚀界面反应过程对应的容抗弧,低频区 (<10^-²) 为点蚀形核期产生的感抗弧；腐蚀30 d后电极反应过程受扩散过程控制。提出了红壤对管线钢的高腐蚀性与红壤铁氧化物间的关联。

关键词 ：土壤腐蚀, 管道钢, 酸性红壤, 红壤

Abstract：

Corrosion of X80 pipeline steel in an acidic red soil slurry was studied by means of electrochemical impedance spectroscopy (EIS) and polarization technique. The results show that in a water-saturated red soil, the EIS of X80 steel contains a capacitive arc at high frequency and a capacitive arc from the interface process in frequency region of 10^-²~10⁴ Hz as well as an inductive loop appears at low frequency exhibiting processes related with adsorption or pitting nucleation; the electrode process was controlled by diffusion process after 30 d exposure; iron oxides residing in the soil tend to enhance the corrosion process of the steel, correspondingly a corrosion mechanism has been proposed.

Key words： soil corrosion pipeline steel acidic soil red soil

ZTFLH:

TG174

基金资助:基金项目：国家自然科学基金项目 (51131001) 资助

作者简介: null

么惠平，男，1969年生，助理工程师，研究方向为长输管道的运营和管理

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引用本文:

么惠平, 闫茂成, 杨旭, 孙成. X80管线钢红壤腐蚀初期电化学行为[J]. 中国腐蚀与防护学报, 2014, 34(5): 472-476.
Huiping YAO, Maocheng YAN, Xu YANG, Cheng SUN. Electrochemical Behavior of X80 Pipeline Steel in the Initial Stage of Corrosion in an Acidic Red Soil. Journal of Chinese Society for Corrosion and protection, 2014, 34(5): 472-476.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.171 或 https://www.jcscp.org/CN/Y2014/V34/I5/472

图1 X80管线钢的显微组织结构

图2 X80管道钢在水饱和红壤中分别暴露1和60 d后的Tafel曲线

图3 X80管线钢在鹰潭红壤泥浆中埋样不同时间后的EIS谱

图4 X80钢在水饱和红壤泥浆中暴露10和60 d后试样的SEM像

图5 X80管线钢在红壤泥浆中测量的EIS的等效电路

表1 由等效电路 (CsRs) (QdlRct)拟合所得电化学参数

图6 由等效电路 (CsRs) (QdlRct) 拟合得到的Rs与Rct随埋样时间的变化

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