硫脲基咪唑啉季铵盐缓蚀剂对X80管线钢腐蚀的影响

doi:10.11902/1005.4537.2020.015

中国腐蚀与防护学报

2021, Vol. 41

Issue (1): 60-70 DOI: 10.11902/1005.4537.2020.015

研究报告

本期目录 | 过刊浏览

硫脲基咪唑啉季铵盐缓蚀剂对X80管线钢腐蚀的影响

白云龙¹^,², 沈国良², 覃清钰¹, 韦博鑫¹, 于长坤¹, 许进¹(

), 孙成¹

^1.中国科学院金属研究所辽宁沈阳土壤大气环境材料腐蚀国家野外科学观测研究站沈阳 110016
^2.沈阳工业大学石油化工学院辽阳 110870

Effect of Thiourea Imidazoline Quaternary Ammonium Salt Corrosion Inhibitor on Corrosion of X80 Pipeline Steel

BAI Yunlong¹^,², SHEN Guoliang², QIN Qingyu¹, WEI Boxin¹, YU Changkun¹, XU Jin¹(

), SUN Cheng¹

^1.Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Petrochemical Engineering, Shenyang University of Technology, Liaoyang 110870, China

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摘要:

考察硫脲基咪唑啉季铵盐 (IM-S1) 缓蚀剂对X80管线钢在3种不同pH的模拟油田水溶液中的缓蚀性能。采用电化学极化曲线、电化学阻抗分析、SVET、表面形貌分析等方法，研究缓蚀剂在不同pH、不同温度的模拟油田水溶液对X80管线钢的缓蚀性能。极化曲线测试显示，pH7.2环境中的腐蚀电流密度最小，其次是pH10.5，在pH3.5环境中的腐蚀电流密度最大；并随温度升高，腐蚀电流密度均有所升高。电化学阻抗的测试表明，在pH7.2模拟溶液条件下，所显示的容抗弧直径最大，且拟合结果中R_ct明显高于其他两种测试条件。SVET分析显示，在pH7.2的测试条件下，管线钢表面吸附成膜性要优于其他两种测试条件；且离子电流密度随时间呈下降趋势，说明缓蚀剂粒子更适宜在此pH值条件下吸附成膜。根据SEM分析，可以明显看出，IM-S1缓蚀剂在中性条件的缓蚀效果要优于pH3.5和pH10.5条件的缓蚀作用效果。IM-S1缓蚀剂更适宜在中性条件下使用，并且在中低温 (40~60 ℃) 条件下具有良好的缓蚀效果。该类缓蚀剂在中性溶液条件的吸附成膜性要优于酸性和碱性条件的成膜性，并且吸附成膜降低离子电流密度，从而有效降低腐蚀反应速率。

关键词 ：硫脲基咪唑啉季铵盐, 缓蚀剂, 模拟油田水溶液, X80管线钢, 电化学, SVET

Abstract：

The effect of the thiourea base imidazoline quaternary ammonium salt corrosion inhibitor on the corrosion performance of X80 pipeline steel in three simulated oil-field waters with different pH was assessed by means of polarization curve measurement, electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET) as well as characterization of corrosion morphology and corrosion products. Polarization curve measurement showed that the corrosion current density was the lowest in the water of pH7.2, followed by pH10.5, while the corrosion current density was the highest in the water of pH3.5，and as the temperature increased, the corrosion current density also increased. The EIS results showed that the diameter of capacitive reactance arc was the largest in the water of pH7.2, accordingly, the R_ct in the fitting result was significantly higher than those in the other two waters. The SVET analysis revealed that the adsorption film formation on the surface of pipeline steel in the water of pH7.2 was better than in the other two waters, while the ion current density decreased with time, indicating that the corrosion inhibitor molecule is more suitable for the case in the water of pH7.2. The film formation by adsorption reduces the ion current density, thereby effectively reduces the corrosion reaction rate. In conclusion, the corrosion inhibitor is much suitable for use in neutral waters and it has good corrosion inhibition effect in the temperature range of 40~60 ℃.

Key words： IM-S1 corrosion inhibitor simulated oil-field water X80 pipeline steel electrochemistry SVET

收稿日期: 2020-01-15

ZTFLH:

TQ252.3

基金资助:国家自然科学基金(51771213)

通讯作者: 许进 E-mail: xujin@imr.ac.cn

Corresponding author: XU Jin E-mail: xujin@imr.ac.cn

作者简介: 白云龙，男，1990年生，硕士

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引用本文:

白云龙, 沈国良, 覃清钰, 韦博鑫, 于长坤, 许进, 孙成. 硫脲基咪唑啉季铵盐缓蚀剂对X80管线钢腐蚀的影响[J]. 中国腐蚀与防护学报, 2021, 41(1): 60-70.
Yunlong BAI, Guoliang SHEN, Qingyu QIN, Boxin WEI, Changkun YU, Jin XU, Cheng SUN. Effect of Thiourea Imidazoline Quaternary Ammonium Salt Corrosion Inhibitor on Corrosion of X80 Pipeline Steel. Journal of Chinese Society for Corrosion and protection, 2021, 41(1): 60-70.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.015 或 https://www.jcscp.org/CN/Y2021/V41/I1/60

图1 硫脲基咪唑啉季铵盐的红外光谱图

图2 IM-S1分子结构图

图3 不同pH值和温度条件下X80管线钢在有无缓蚀剂的模拟油田水溶液中的失重结果

图4 不同pH值条件下X80管线钢在模拟油田水溶液中的缓蚀效率

图5 不同pH条件下X80管线钢在有无缓蚀剂的模拟油田水溶液中的极化曲线

表1 不同pH条件下X80管线钢在有无缓蚀剂的模拟油田水溶液中极化曲线参数

图6 不同pH条件下X80管线钢在有无缓蚀剂的模拟油田水溶液中的Nyquist图

图7等效电路图

Inhibitor	T ℃	pH	R_s Ω·cm²	CPE_dl, Y_o S·sⁿ·cm^-2	n	R_ct Ω·cm²	η %
Blank	25	3.5	3.73	3.534 $×$ 10^-4	0.7723	350.1	---
		7.2	6.65	1.506 $×$ 10^-4	0.8511	412.4	---
		10.5	7.42	5.596 $×$ 10^-3	0.7686	723.6	---
	40	3.5	3.31	5.878 $×$ 10^-4	0.6887	134.5	---
		7.2	3.68	5.649 $×$ 10^-4	0.7662	299.3	---
		10.5	5.32	2.44 $×$ 10^-3	0.6243	604.6	---
	60	3.5	3.92	4.98 $×$ 10^-4	0.7303	118.5	---
		7.2	3.64	5.475 $×$ 10^-4	0.7932	257.0	---
		10.5	5.53	3.738 $×$ 10^-3	0.5908	372.2	---
80 mg/L	25	3.5	11.78	6.006 $×$ 10^-4	0.8291	2645	86.8
		7.2	14.00	3.136 $×$ 10^-4	0.7605	4670	91.2
		10.5	14.04	1.553 $×$ 10^-3	0.6660	1859	61.1
	40	3.5	13.45	3.83 $×$ 10^-4	0.7210	1343	90.0
		7.2	17.01	3.141 $×$ 10^-4	0.7932	4478	93.3
		10.5	7.659	3.979 $×$ 10^-3	0.6378	1334	54.7
	60	3.5	13.11	8.772 $×$ 10^-4	0.7998	555.7	78.7
		7.2	12.96	6.584 $×$ 10^-4	0.8127	2322	88.9
		10.5	9.211	2.97 $×$ 10^-3	0.6461	729.8	49.0

表2 不同pH条件下X80管线钢在有无缓蚀剂的模拟油田水溶液中的电化学阻抗谱拟合参数

图8 X80管线钢在模拟油田水溶液中的腐蚀产物形貌图

图9 X80管线钢在模拟油田水溶液中的清洗腐蚀产物后腐蚀表面形貌图

图10 X80管线钢没有添加缓蚀剂的25 ℃模拟油田水溶液中的SVET图像

表3 X80管线钢在油田模拟水溶液中的离子电流密度值 (mA·cm-2)

图11 X80管线钢在含有80 mg/L缓蚀剂的25 ℃模拟油田水溶液中的SVET图像

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