H<sub>2</sub>S/CO<sub>2</sub>对J55钢腐蚀的影响机制

doi:10.11902/1005.4537.2021.262

中国腐蚀与防护学报

2022, Vol. 42

Issue (5): 785-790 DOI: 10.11902/1005.4537.2021.262

研究报告

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H₂S/CO₂对J55钢腐蚀的影响机制

赵国仙¹, 王映超¹(

), 张思琦¹, 宋洋²

^1.西安石油大学材料科学与工程学院西安 710065
^2.西安摩尔石油工程实验室股份有限公司西安 710065

Influence Mechanism of H₂S/CO₂-charging on Corrosion of J55 Steel in an Artificial Solution

ZHAO Guoxian¹, WANG Yingchao¹(

), ZHANG Siqi¹, SONG Yang²

^1.School of Material Science and Technology, Xi'an Shiyou University, Xi'an 710065, China
^2.Xi'an Maurer Petroleum Engineering Laboratory, Co. Ltd., Xi'an 710065, China

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摘要:

通过浸泡腐蚀实验与高温高压电化学测试,研究了J55钢在1.0 MPa CO₂、0.3 MPa H₂S及1.0 MPa CO₂+0.3 MPa H₂S气体组分下的腐蚀特征,并采用XRD、SEM和EDS分析腐蚀产物膜组成与形貌。结果显示,溶液中气体组分为H₂S及CO₂+H₂S下的腐蚀速率相近,其表面产物为FeS。在只含H₂S气体时,J55钢的表面FeS产物膜致密；而在CO₂氛围下J55钢的腐蚀速率最高,其产物为疏松、覆盖率较低的FeCO₃。高温高压原位电化学测试显示,不含腐蚀气体时溶液介质对J55钢的腐蚀表现为阴极控制；加入H₂S使腐蚀转为阳极控制,腐蚀电位明显升高；而CO₂的加入能强化阴极控制效果,同时降低腐蚀电位；溶液中CO₂与H₂S共存时,CO₂使FeS的成膜电位增加。EIS图显示,J55钢在不含腐蚀性气体时极化电阻最大,仅含CO₂时极化电阻最小,仅含H₂S时出现高频容抗弧与低频容抗弧两个时间常数。

关键词 ： J55钢, H₂S腐蚀, CO₂腐蚀, 高温高压电化学

Abstract：

The corrosion characteristics of J55 steel in an artificial solution charged with 1.0 MPa CO₂, 0.3 MPa H₂S and 1.0 MPa CO₂+0.3 MPa H₂S respectively, in a high-temperature and high-pressure autoclave were studied via immersion corrosion test and electrochemical test, while the tested steels were characterized by means of XRD, SEM and EDS. The results show that in solutions charged with H₂S and CO₂+H₂S the J55 steel presents the similar corrosion rate, and in the solution charged with CO₂ the J55 steel exhibits the highest corrosion rate, accordingly, the formed corrosion product is the loose FeCO₃ with low coverage. Comparatively, the corrosion product formed in the H₂S charged solution is compact FeS, and the FeS generated in the CO₂+H₂S charged electrolyte is thinner and less compact. The in-situ electrochemical test at high temperature and high pressure showed that the corrosion process of J55 steel in the plain solution without charge of corrosive gas was controlled by the cathodic reaction. The charging H₂S could result in the transformation of the controlled step from the cathodic reaction into anodic reaction, correspondingly, the corrosion potential increased significantly. The charging CO₂ could strengthen the cathodic reaction control effect and reduce the corrosion potential. When CO₂ and H₂S coexisted, CO₂ could promote the increase of the formation potential of FeS film. EIS diagram shows that the polarization resistance of J55 steel is the largest in the plain solution without corrosive gas, while the polarization resistance is the smallest in the solution charged with CO₂ only, and two time-constants of high frequency capacitive arc and low frequency capacitive arc emerged for the J55 steel only in the H₂S charged solution.

Key words： J55 Steel H₂S corrosion CO₂corrosion high temperature and high pressure electrochemistry

收稿日期: 2021-09-27

ZTFLH:

TG174

通讯作者: 王映超 E-mail: 879795654@qq.com

Corresponding author: WANG Yingchao E-mail: 879795654@qq.com

作者简介: 赵国仙,女,1968年生,博士,教授

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引用本文:

赵国仙, 王映超, 张思琦, 宋洋. H₂S/CO₂对J55钢腐蚀的影响机制[J]. 中国腐蚀与防护学报, 2022, 42(5): 785-790.
Guoxian ZHAO, Yingchao WANG, Siqi ZHANG, Yang SONG. Influence Mechanism of H₂S/CO₂-charging on Corrosion of J55 Steel in an Artificial Solution. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 785-790.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.262 或 https://www.jcscp.org/CN/Y2022/V42/I5/785

图1 高温高压釜模拟腐蚀实验的结果

图2 J55钢在不同气体组分下的腐蚀形貌及腐蚀产物EDS分析

图3 在3种模拟环境中J55钢的腐蚀产物XRD图谱

图4 在4种实验环境中J55钢的极化曲线

表1 J55钢极化曲线Tafel拟合结果

图5 在4种实验环境中中J55钢的电化学阻抗图谱及等效电路

图6 在4种实验环境中J55钢的Bode图

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