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

doi:10.11902/1005.4537.2019.056

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

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

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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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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

Received: 10 May 2019

ZTFLH:

TG172.9

Fund: National Science and Technology Major Project(2016ZX05028-004)

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

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	Qiaoyan JIA
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	Qingping LI
	Minxu LU

Cite this article:

JIA Qiaoyan, WANG Bei, WANG Yun, ZHANG Lei, WANG Qing, YAO Haiyuan, LI Qingping, LU Minxu. 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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.056 OR https://www.jcscp.org/EN/Y2020/V40/I3/230

Fig.1 Structural of seventeen alkenyl amide ethyl imidazoline quaternary ammonium salt (a) and decyl mercaptan (b)

Fig.2 Corrosion rates of X65 steel in different corrosive medium

Fig.3 Macroscopic corrosion morphologies of X65 steel in different medium after immersion for 3 d: (a) water, before pickling; (b) water, after pickling; (c) water+ oil, before pickling; (d) water+oil, after pickling; (e) water+oil+100 mg/L 10SH, before pickling; (f) water+oil+100 mg/L 10SH, after pickling

Fig.4 Enlarged morphologies of corrosion groove of X65 steel in oil-water interface region with 100 mg/L decyl mercaptan: (a) macro corrosion morphology, (b) micro corrosion morphologies 3D profile, (c) depth curve of guttering corrosion

Fig.5 Micro morphologies of different areas of X65 steel: (a) 0 mg/L, in oil region; (b) 0 mg/L, at the oil-water interface; (c) 0 mg/L, in water region; (d) 100 mg/L, in oil region; (e) 100 mg/L, at the oil-water interface; (f) 100 mg/L, in water region

Fig.6 XRD spectra of corrosion product film of carbon steel in aqueous phase: (a) in oil-water stratified medium, (b) in the oil-water stratified medium with 100 mg/L decyl mercaptan

Fig.7 Electrochemical test results of X65 steel in oil-water stratified medium with different corrosion inhibitors: (a) potentiodynamic polarization curve, (b) corrosion inhibition efficiency

Fig.8 EIS results of X65 steel in oil-water stratified medium with different corrosion inhibitors: (a) oil-water stratified medium, (b) oil-water stratified medium with 300 mg/L decyl mercaptan, (c) oil-water stratified medium with 300 mg/L seventeen alkenyl amide ethyl imidazoline quaternary ammonium salt

Fig.9 Equivalent circuit used for fitting the EIS results: (a) single capacitive reactance, (b) double capacitive reactance, (c) capacitive reactance+inductive reactance+capacitive reactance

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

Table 1 Parameter values of the equivalent circuit

Fig.10 R_p values of EIS fitting result

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