X80管线钢在滨海滩涂土壤模拟液中的电化学腐蚀行为

doi:10.11902/1005.4537.2014.134

中国腐蚀与防护学报

2015, Vol. 35

Issue (4): 339-344 DOI: 10.11902/1005.4537.2014.134

本期目录 | 过刊浏览

X80管线钢在滨海滩涂土壤模拟液中的电化学腐蚀行为

张宁^1,²,孙虎元¹(

),孙立娟¹,刘栓^1,²

2. 中国科学院大学北京 100049

Electrochemical Corrosion Behavior of X80 Pipeline Steel in a Simulated Soil Solution for Coastal Tidal Flat Wetland

Ning ZHANG^1,²,Huyuan SUN¹(

),Lijuan SUN¹,Shuan LIU^1,²

1. Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences,Qingdao 266071, China
2. University of Chinese Academy of Sciences, Beijing 100049, China

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摘要:

应用EIS和动电位极化曲线测试技术,结合腐蚀形貌观察,研究了X80管线钢在滨海滩涂土壤模拟液中的电化学腐蚀行为。结果表明,X80管线钢在滨海滩涂土壤模拟液中的腐蚀行为随浸泡时间和腐蚀产物的变化而改变。分析EIS得出,其经历了先缓慢增大,到由于黑色锈层形成而迅速激增,再到锈层脱落而急剧减小的过程,说明X80管线钢的电化学腐蚀行为主要分3个阶段,即初期腐蚀产物膜未形成时腐蚀速率缓慢增大阶段；中期因保护性腐蚀产物膜形成,腐蚀速率迅速减小阶段；后期部分腐蚀产物脱落等因素导致腐蚀速率再次增大阶段。

关键词 ： X80管线钢, 滩涂, 土壤模拟液, 电化学腐蚀, 电化学阻抗谱

Abstract：

The electrochemical corrosion behavior of X80 pipeline steel in a simulated soil solution for coastal tidal flat wetland was studied by using the polarization curves, electrochemical impedance spectroscopy and corrosion morphology observation. The results indicated that immersion time and corrosion products had a significant impact on the corrosion behavior of X80 pipeline steel in the simulated soil solution. At the initial immersion, the impedance of X80 increased slowly. With the prolongation of immersion time and the formation of a black rust layer, the impedance of X80 increased sharply. And then, since the spallation of the rust layer, the impedance of X80 rapidly decreased. The electrochemical corrosion behavior of X80 pipeline steel can be divided into three phases. In the initial phase, the corrosion rate increases slowly before the formation of a corrosion product film. In the interim phase, the corrosion rate decreases rapidly due to the formation of a protective corrosion product film. In the later phase, the corrosion rate increases again due to the partial spallation of the protective film and other facts.

Key words： X80 pipeline steel coastal tidal flat wetland simulated soil solution electrochemical corrosion EIS

基金资助:国家自然科学基金项目 (41476067) 资助

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引用本文:

张宁,孙虎元,孙立娟,刘栓. X80管线钢在滨海滩涂土壤模拟液中的电化学腐蚀行为[J]. 中国腐蚀与防护学报, 2015, 35(4): 339-344.
Ning ZHANG, Huyuan SUN, Lijuan SUN, Shuan LIU. Electrochemical Corrosion Behavior of X80 Pipeline Steel in a Simulated Soil Solution for Coastal Tidal Flat Wetland. Journal of Chinese Society for Corrosion and protection, 2015, 35(4): 339-344.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.134 或 https://www.jcscp.org/CN/Y2015/V35/I4/339

图1 X80管线钢在滨海滩涂土壤模拟液中浸泡不同时间的EIS谱

图2 X80管线钢在滨海滩涂土壤模拟液中的等效电路图

表1 X80管线钢在滨海滩涂土壤模拟液中浸泡不同时间的EIS拟合参数

图3 锈层电阻 (Rr) 和总电阻 (Rs+Rr+Rct) 随浸泡时间的变化

图4 X80管线钢在滨海滩涂土壤模拟液中浸泡不同时间的动电位极化曲线

表2 X80管线钢在滨海滩涂土壤模拟液中浸泡不同时间的动电位极化曲线拟合参数

图5 X80管线钢在滨海滩涂土壤模拟液中浸泡前后的腐蚀形貌

图6 X80管线钢在滨海滩涂土壤模拟液中浸泡前后的SEM像

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