乙二醇对X65钢在CO<sub>2</sub>饱和的3.5%NaCl溶液中腐蚀行为的影响研究

doi:10.11902/1005.4537.2016.065

中国腐蚀与防护学报

2017, Vol. 37

Issue (4): 375-381 DOI: 10.11902/1005.4537.2016.065

研究报告

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乙二醇对X65钢在CO₂饱和的3.5%NaCl溶液中腐蚀行为的影响研究

蒋秀¹(

), 宋晓良¹, 张全², 刘艳¹, 刘曦泽¹, 屈定荣¹

1 中国石油化工股份有限公司青岛安全工程研究院青岛 266071
2 中国海洋大学化学化工学院青岛 266100

Effect of Ethylene Glycol on Corrosion Behavior of X65 Mild Steel in CO₂-saturated 3.5%NaCl Solution

Xiu JIANG¹(

), Xiaoliang SONG¹, Quan ZHANG², Yan LIU¹, Xize LIU¹, Dingrong QU¹

1 SINOPEC Research Institute of Safety Engineering, Qingdao 266071, China
2 College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

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摘要:

采用接触角、pH值和粘度测量等方法研究了40% (质量分数) 乙二醇对CO₂饱和的3.5% (质量分数) NaCl溶液及其凝结液性质的影响,采用失重、电化学和扫描电镜等方法研究了40%乙二醇对X65钢管道顶部气相和管道底部液相腐蚀行为的影响。结果表明：在常压、35 ℃条件下,40%乙二醇增加了CO₂饱和的3.5%NaCl溶液及凝结液与X65钢表面的接触角、pH值及粘度;在3.5%NaCl溶液和3.5%NaCl+40%乙二醇溶液中,管道顶部的凝结液pH值均明显低于管道底部溶液;40%乙二醇加速了液相腐蚀产物膜的形成,降低了X65钢管道底部的均匀腐蚀速率,促进了管道底部发生小孔腐蚀;乙二醇对X65钢管道顶部的均匀腐蚀速率未造成明显影响,但加速了小孔腐蚀的发生。

关键词 ：乙二醇, 凝结液, CO₂, 顶部, 底部, 腐蚀

Abstract：

The effect of 40% (mass fraction) ethylene glycol on the performance of CO₂ saturated 3.5% (mass fraction) NaCl solution and relevant condensates was assessed by measurements of contact angle, pH and viscosity. Effect of 40% ethylene glycol on both top of line corrosion and bottom of line corrosion for X65 mild steel pipeline was investigated by means of weight loss, electrochemical method and scanning electron microscopy (SEM). Results indicated that contact angle, pH and viscosity of 3.5%NaCl solution saturated by CO₂ and relevant condensates were increased due to the incorporation of 40% ethylene glycol at 35 ℃ and 1 atm. In the presence of solution of 3.5%NaCl or 3.5%NaCl+40% ethylene glycol, the pH value of the condensates formed on the top of line was lower than that on the bottom of pipeline. Due to the addition of 40% ethylene glycol to 3.5%NaCl solution, the deposition of corrosion products and pitting corrosion were accelerated, while the general corrosion rate of the bottom of pipeline was decreased. In fact, the general corrosion rate of the top of line for X65 mild steel pipeline was not obviously affected by 40% ethylene glycol, but the pitting corrosion was speeded up.

Key words： ethylene glycol condensate CO₂ top of line bottom of line corrosion

收稿日期: 2016-05-20

ZTFLH:

TE988.2

作者简介:

作者简介蒋秀,女,1976年生,博士,高级工程师

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引用本文:

蒋秀, 宋晓良, 张全, 刘艳, 刘曦泽, 屈定荣. 乙二醇对X65钢在CO₂饱和的3.5%NaCl溶液中腐蚀行为的影响研究[J]. 中国腐蚀与防护学报, 2017, 37(4): 375-381.
Xiu JIANG, Xiaoliang SONG, Quan ZHANG, Yan LIU, Xize LIU, Dingrong QU. Effect of Ethylene Glycol on Corrosion Behavior of X65 Mild Steel in CO₂-saturated 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2017, 37(4): 375-381.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.065 或 https://www.jcscp.org/CN/Y2017/V37/I4/375

图1 测试系统结构示意图

图2 在35 ℃下3.5%NaCl和3.5%NaCl+40%乙二醇溶液的气相中暴露试样表面液滴的凝结

表1 3.5%NaCl溶液和3.5%NaCl+40%乙二醇溶液及其凝结液的pH值、粘度及与金属表面的接触角

图3 X65钢在35 ℃下3.5%NaCl溶液和3.5%NaCl+40%乙二醇溶液中的腐蚀速率随时间的变化

图4 X65钢在35 ℃下含不同浓度乙二醇的3.5%NaCl溶液气相和液相中的腐蚀速率

图5 X65钢在35 ℃下含不同浓度乙二醇的3.5%NaCl溶液气相中腐蚀24 h后的腐蚀形貌

图6 X65钢在35 ℃下含不同浓度的乙二醇的3.5%NaCl溶液液相中腐蚀24 h后的腐蚀形貌

表2 乙二醇影响因子随质量浓度的变化

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