醋酸对X70管线钢CO<sub>2</sub>湿气顶部腐蚀行为影响

doi:10.11902/1005.4537.2015.058

中国腐蚀与防护学报

2016, Vol. 36

Issue (3): 231-237 DOI: 10.11902/1005.4537.2015.058

研究报告

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醋酸对X70管线钢CO₂湿气顶部腐蚀行为影响

赵书振¹,许立宁¹(

),窦娟娟¹,常炜²,路民旭¹

1. 北京科技大学新材料技术研究院北京 100083
2. 中海石油研究总院北京 100027

Influence of Acetic Acid on Top Localized Corrosion of X70 Steel Pipeline in CO₂ Containing Wet Gas

Shuzhen ZHAO¹,Lining XU¹(

),Juanjuan DOU¹,Wei CHANG²,Minxu LU¹

1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2. CNOOC Research Center, Beijing 100027, China

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摘要:

采用动电位极化曲线和电化学阻抗法研究了X70管线钢在含不同浓度醋酸 (HAc) 饱和CO₂溶液中的电化学腐蚀行为,并用高温高压冷凝釜研究了HAc对X70钢顶部腐蚀行为的影响。结果表明,在饱和CO₂条件下,X70钢一直处于活化状态,随着HAc浓度的升高,其腐蚀电位正向偏移,腐蚀电流密度增大,这与H⁺浓度升高,促进了阴极反应有关。此外,HAc会破坏顶部试样表面沉积性保护膜,使产物膜变得疏松易脱落,直至局部基体裸露,加剧了局部腐蚀。同时,在实验和理论的基础上建立了HAc引起点蚀的机理模型,详细阐述了HAc对点蚀坑形成与发展的影响。

关键词 ： X70管线钢, 醋酸, 顶部腐蚀, 局部腐蚀, 湿气

Abstract：

The electrochemical corrosion behavior of X70 steel in CO₂ saturated solution with various concentrations of acetic acid was studied by means of potentiodynamic polarization measurement and EIS. Whilst the influence of acetic acid on the top localized corrosion (TLC) of X70 steel pipelines was examined in a set of high temperature and high pressure autoclave. The results showed that in the CO₂ saturated solution, the X70 steel was inactive state. While the free corrosion potential of X70 steel shifted positively and its corrosion current density increased with the increasing concentration of acetic acid, which may be related to the rising H⁺ concentration, so that the cathodic reaction was promoted. In addition, because of the presence of acetic acid, the corrosion scale become loose and easy to detach from the substrate. Finally a pitting corrosion model was proposed to describe the initiation and evolution of the pitting process.

Key words： X70 pipeline steel acetic acid top of pipeline localized corrosion wet gas

收稿日期: 2015-05-26

基金资助:国家科技重大专项项目 (2011ZX05056) 资助

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引用本文:

赵书振,许立宁,窦娟娟,常炜,路民旭. 醋酸对X70管线钢CO₂湿气顶部腐蚀行为影响[J]. 中国腐蚀与防护学报, 2016, 36(3): 231-237.
Shuzhen ZHAO, Lining XU, Juanjuan DOU, Wei CHANG, Minxu LU. Influence of Acetic Acid on Top Localized Corrosion of X70 Steel Pipeline in CO₂ Containing Wet Gas. Journal of Chinese Society for Corrosion and protection, 2016, 36(3): 231-237.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.058 或 https://www.jcscp.org/CN/Y2016/V36/I3/231

图1 高温高压冷凝反应釜结构示意图

图2 X70钢在含不同浓度HAc饱和CO2溶液中的动电位极化曲线

图3 X70钢在含不同浓度HAc的饱和CO2溶液中的EIS谱和等效拟合电路图

表1 X70钢在含不同浓度HAc的饱和CO2溶液中的EIS等效电路拟合结果

图4 X70钢在含不同浓度HAc的CO2饱和溶液中的腐蚀速率

图5 X70钢经含不同浓度HAc的饱和CO2溶液腐蚀后酸洗前后的宏观形貌

图6 X70钢在含不同浓度HAc的饱和CO2溶液中腐蚀后的表面SEM像

图7 X70钢表面腐蚀产物的EDS结果

图8 试样表面腐蚀产物的XRD谱

图9 X70钢最深点蚀坑的三维形貌

表2 不同HAc浓度下X70钢的点蚀坑深度

图10 HAc引发点蚀形成机制示意图

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