X65管线钢在油水两相界面处的CO<sub>2</sub>腐蚀行为研究

doi:10.11902/1005.4537.2019.056

中国腐蚀与防护学报

2020, Vol. 40

Issue (3): 230-236 DOI: 10.11902/1005.4537.2019.056

研究报告

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X65管线钢在油水两相界面处的CO₂腐蚀行为研究

贾巧燕¹, 王贝¹, 王赟¹, 张雷¹(

), 王清², 姚海元², 李清平², 路民旭¹

1 北京科技大学新材料技术研究院北京 100083
2 中海油研究总院北京 100028

Corrosion Behavior of X65 Pipeline Steel at Oil-Water Interface Region in Hyperbaric CO₂ Environment

JIA Qiaoyan¹, WANG Bei¹, WANG Yun¹, ZHANG Lei¹(

), WANG Qing², YAO Haiyuan², LI Qingping², LU Minxu¹

1 Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2 China National Offshore Oil Corporation Research Institute, Beijing 100028, China

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摘要:

利用失重法、电化学极化法、电化学阻抗谱及腐蚀形貌观察和腐蚀产物物相分析，研究了油水分层介质中X65管线钢在油水两相界面处的腐蚀行为及不同缓蚀剂在油水界面处的作用效果。结果表明，在CO₂分压为0.9 MPa，温度为60 ℃，静止状态下的油水分层介质中，X65钢在油相区几乎不发生腐蚀，在油水两相界面处发生局部腐蚀，在水相区发生严重腐蚀。添加水溶性缓蚀剂十七烯基胺乙基咪唑啉季铵盐使得X65钢在该工况下的腐蚀速率降低，添加油溶性缓蚀剂癸硫醇反而使得X65钢在油水两相界面处的局部腐蚀加重，甚至出现了腐蚀沟槽。

关键词 ：油水界面, 电化学, CO₂腐蚀, 缓蚀剂

Abstract：

The corrosion behavior of X65 pipeline steel at oil-water interface region in hyperbaric CO₂ environment was studied by means of weight loss method, polarization curve, electrochemical impedance spectroscopy and other electrochemical analysis techniques, as well as corrosion morphology observation and corrosion products analysis. The results revealed that the X65 steel had little corrosion in the oil phase, local corrosion occurred at the interface region between oil and water, severe corrosion occurred in the aqueous region, where the oil-water stratified medium was under stationary state with CO₂ partial pressure of 0.9 MPa at 60 ℃. The addition of seventeen alkenyl amide ethyl imidazoline quaternary ammonium salt, which is water soluble rust inhibitor, could reduced the corrosion rate of X65 steel under this condition, while the addition of the decyl mercaptan, which is oil soluble rust inhibitor, could aggravated the local corrosion of X65 steel at the oil-water interface, whilst, groove corrosion was observed at the oil-water interface.

Key words： oil-water interface electrochemical method CO₂ corrosion corrosion inhibitor

收稿日期: 2019-05-10

ZTFLH:

TG172.9

基金资助:国家科技重大专项(2016ZX05028-004)

通讯作者: 张雷 E-mail: zhanglei@ustb.edu.cn

Corresponding author: ZHANG Lei E-mail: zhanglei@ustb.edu.cn

作者简介: 贾巧燕，女，1992年生，硕士

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引用本文:

贾巧燕, 王贝, 王赟, 张雷, 王清, 姚海元, 李清平, 路民旭. X65管线钢在油水两相界面处的CO₂腐蚀行为研究[J]. 中国腐蚀与防护学报, 2020, 40(3): 230-236.
Qiaoyan JIA, Bei WANG, Yun WANG, Lei ZHANG, Qing WANG, Haiyuan YAO, Qingping LI, Minxu LU. Corrosion Behavior of X65 Pipeline Steel at Oil-Water Interface Region in Hyperbaric CO₂ Environment. Journal of Chinese Society for Corrosion and protection, 2020, 40(3): 230-236.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.056 或 https://www.jcscp.org/CN/Y2020/V40/I3/230

图1 十七烯基胺乙基咪唑啉季铵盐和癸硫醇的结构

图2 X65钢在不同腐蚀介质中的腐蚀速率

图3 X65钢在不同介质中浸泡3 d后的宏观腐蚀形貌

图4 X65钢在加入100 mg/L癸硫醇的油水两相界面区域腐蚀沟槽形貌

图5 X65钢表面不同区域的微观形貌

图6 X65钢在水相中的腐蚀产物膜XRD谱

图7 X65钢在加入不同缓蚀剂的油水分层介质中的电化学测试结果

图8 X65钢在加入不同缓蚀剂的油水分层介质中的电化学阻抗谱

图9 EIS等效电路图

Condition		R_s / Ω·cm²	CPE_film		R_f / Ω·cm²	CPE_dl		R_ct / Ω·cm²	R_L / Ω·cm²	L / H
Variety	t / h	R_s / Ω·cm²	Y₁ / S· $s n 1$ ·cm^-2	n₁	R_f / Ω·cm²	Y₂ / S· $s n 2$ ·cm^-2	n₂	R_ct / Ω·cm²	R_L / Ω·cm²	L / H
Blank	1	4.005	767.1	0.778	28.30	4640	1.000	19.09	58.36	7.363
	3	4.575	1901	0.861	17.25	11710	1.000	7.534	52.77	5.754
	5	4.547	2723	0.868	13.99	13610	1.000	6.884	44.38	5.451
	7	4.619	4817	0.859	11.47	16610	1.000	6.958	36.31	5.549
	9	4.921	5061	0.962	8.265	34240	1.000	4.150	---	---
	11	4.808	5908	0.982	7.948	44920	1.000	4.112	---	---
10SH	1	4.934	1130	0.627	37.99	64360	1.000	5.764	76.59	70.98
	3	4.972	10330	0.659	21.53	54020	1.000	6.45	62.23	41.10
	5	4.964	9694	0.706	18.70	64510	1.000	6.884	44.38	5.451
	7	4.978	9276	0.766	15.42	62770	1.000	6.497	61.35	34.68
	9	5.039	9663	0.782	14.34	73720	0.963	11.08	61.49	35.19
	11	4.966	9095	0.825	13.73	59450	1.000	7.244	63.42	41.26
OAI	1	571.7	---	---	---	1.56	0.593	947.8	---	---
	3	398.6	---	---	---	1.50	0.592	864	---	---
	5	14.81	---	---	---	2.68	0.8	779.7	246	735.7
	7	13.58	---	---	---	4.44	0.8	529.7	1128	328.6
	9	5.423	127.1	0.520	18.81	3.49	0.596	686.4	1278	426.8
	11	5.51	118.8	0.523	19.01	3.34	0.606	680.7	1238	519.2

表1 等效电路各参数值

图10 EIS拟合结果所得Rp值

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