温度对X70钢在含CO<sub>2</sub>地层水中腐蚀行为影响

doi:10.11902/1005.4537.2020.049

中国腐蚀与防护学报

2021, Vol. 41

Issue (2): 233-240 DOI: 10.11902/1005.4537.2020.049

研究报告

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温度对X70钢在含CO₂地层水中腐蚀行为影响

明男希, 王岐山, 何川, 郑平, 陈旭(

)

辽宁石油化工大学石油天然气工程学院抚顺 113001

Effect of Temperature on Corrosion Behavior of X70 Steel in an Artificial CO₂-containing Formation Water

MING Nanxi, WANG Qishan, HE Chuan, ZHENG Ping, CHEN Xu(

)

School of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China

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摘要:

利用高温高压反应釜，采用失重、SEM、XRD、EDS和电化学方法研究了不同温度下X70管线钢在含CO₂地层水中的腐蚀行为。讨论了X70钢CO₂腐蚀机理的热力学和动力学机制。结果表明：温度通过影响FeCO₃过饱和度、晶粒形核率和长大速率，进而影响X70钢腐蚀速率。在温度为30 ℃时，FeCO₃的过饱和度较小，不能在X70钢表面连续析出，难以形成保护性产物膜，X70钢腐蚀速率较高。温度为60~90 ℃时，FeCO₃的形核速率大于生长速率，X70钢表面形成致密的FeCO₃膜，腐蚀速率开始下降。继续升温至120和150 ℃，FeCO₃的形核速率小于生长速率，X70钢表面不能形成完整的具有保护性的FeCO₃膜，或膜内应力增大导致膜破裂。FeCO₃膜与基体金属形成电偶电池，发生局部腐蚀。

关键词 ： X70管线钢, 地层水, 温度, CO₂腐蚀, 过饱和度, 形核速率

Abstract：

The corrosion behaviour of X70 pipeline steel in an artificial CO₂-containing formation water at various temperatures was studied in a high-temperature, high-pressure reaction kettle via mass loss measurements, scanning electron microscopy, energy dispersive spectroscopy, X-ray diffractometer, and electrochemical methods. Thermodynamic and kinetic factors related to the CO₂ corrosion mechanism of X70 steel were assessed. The results show that the temperature influenced the corrosion rate of X70 steel by affecting the supersaturation, nucleation rate, and grain growth rate of FeCO₃. The corrosion product scale could not form on the surface of X70 steel at 30 ℃ because of the lower FeCO₃ supersaturation. A dense FeCO₃ scale formed at 60 and 90 ℃, resulting in a decrease in the corrosion rate. When the temperature was higher than 120 ℃, the nucleation rate of FeCO₃ was less than its growth rate, consequently, a complete protective FeCO₃ scale could not form on the X70 steel surface, while the stress accumulation inside the scale led to the rupture of the scale, which may be the cause leading to the formation of a galvanic cell consisting of the FeCO₃ film and matrix metal, which resulted in local corrosion.

Key words： X70 pipeline steel formation water temperature CO₂ corrosion supersaturation nucleation rate

收稿日期: 2020-01-08

ZTFLH:

TG174

基金资助:教育部“春晖”国际合作计划项目和辽宁省教育厅重点;项目(L2017LZD004)

通讯作者: 陈旭 E-mail: cx0402@sina.com

Corresponding author: CHEN Xu E-mail: cx0402@sina.com

作者简介: 明男希，男，1995年生，硕士生

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引用本文:

明男希, 王岐山, 何川, 郑平, 陈旭. 温度对X70钢在含CO₂地层水中腐蚀行为影响[J]. 中国腐蚀与防护学报, 2021, 41(2): 233-240.
Nanxi MING, Qishan WANG, Chuan HE, Ping ZHENG, Xu CHEN. Effect of Temperature on Corrosion Behavior of X70 Steel in an Artificial CO₂-containing Formation Water. Journal of Chinese Society for Corrosion and protection, 2021, 41(2): 233-240.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.049 或 https://www.jcscp.org/CN/Y2021/V41/I2/233

图1 X70钢的显微组织

图2 X70钢在不同温度含CO2地层水中腐蚀速率

图3 X70钢在不同温度含CO2地层水中腐蚀产物的XRD谱

图4 X70钢在不同温度含CO2地层水中的SEM像和EDS结果

图5 X70钢在不同温度含CO2地层水中去除腐蚀产物后的SEM像

图6 X70钢在不同温度含CO2地层水中动电位极化曲线

图7 X70钢在不同温度含CO2地层水中电化学阻抗谱

图8 不同温度下X70钢电化学阻抗谱等效电路

表1 不同温度下X70钢电化学阻抗图谱拟合结果

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