Corrosion Behavior of 20# Steel in Alkanolamine Solution Mixed with Ionic Liquid Containing Saturated CO2

doi:10.11902/1005.4537.2019.095

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (4): 309-316 DOI: 10.11902/1005.4537.2019.095

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Corrosion Behavior of 20# Steel in Alkanolamine Solution Mixed with Ionic Liquid Containing Saturated CO₂

HE San¹(

), SUN Yinjuan², ZHANG Zhihao², CHENG Jie², QIU Yunpeng¹, GAO Chaoyang¹

1. Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China
2. Xi'an Changqing Technology Engineering Co. Ltd. , Xi'an 710000, China

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Abstract

The corrosion behavior of 20# steel in CO₂ saturated mixture liquor of alkanolamine solution with ionic liquid ([Bmim]BF₄) was studied by means of weight loss measurement, electrochemical impedance spectroscopy (EIS) and SEM equipped with EDS. The results showed that monoethanolamine (MEA) was easy to degrade with CO₂, and the formed degradation products would lead to severe corrosion of 20# steel in experimental conditions. When the [Bmim]BF₄ was added, the corrosion of 20# steel was inhibited and hence its uniform corrosion rate was reduced. Besides, due to the existence of BF₄^- in [Bmim]BF₄, the range of passivation zone is narrowed, which is an important cause for pitting corrosion of 20# steel.

Key words: CO₂ capture 20# steel MEA solution [Bmim]BF₄ uniform corrosion pitting corrosion

Received: 28 June 2019

ZTFLH:

TG174

Fund: National Science and Technology Major Project(2016ZX05016-003)

Corresponding Authors: HE San E-mail: hesan@126.com

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	San HE
	Yinjuan SUN
	Zhihao ZHANG
	Jie CHENG
	Yunpeng QIU
	Chaoyang GAO

Cite this article:

HE San, SUN Yinjuan, ZHANG Zhihao, CHENG Jie, QIU Yunpeng, GAO Chaoyang. Corrosion Behavior of 20# Steel in Alkanolamine Solution Mixed with Ionic Liquid Containing Saturated CO₂. Journal of Chinese Society for Corrosion and protection, 2020, 40(4): 309-316.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.095 OR https://www.jcscp.org/EN/Y2020/V40/I4/309

Table 1 Addition amounts of NaBF₄

Fig.1 Variations of uniform corrosion rate of 20# carbon steel with the concentration of [Bmim]BF₄ at 30 and 70 ℃

Fig.2 SEM images of corrosion product films formed on 20# steel after immersion in the mixed solutions with different concentrations of [Bmim]BF₄: (a) 30% MEA+0%[Bmim]BF₄, (b) 30%MEA+5%[Bmim]BF₄, (c) 30%MEA+10%[Bmim]BF₄, (d) 30%MEA+20%[Bmim]BF₄

Fig.3 SEM images of 20# carbon steel after removal of corrosion product films formed during immersion in the mixed solutions with different concentrations of [Bmim]BF₄: (a) 30%MEA+0%[Bmim]BF₄, (b) 30%MEA+20%[Bmim]BF₄

Fig.4 EDS results of the outer layers of corrosion product films formed on 20# steel during immersion in the mixed solutions with different concentrations of [Bmim]BF₄: (a) area I in Fig.2a, (b) area II in Fig.2b, (c) area III in Fig.2c, (d) area IV in Fig.2d

Table 2 EDS analysis results of Fe

Fig.5 Polarization curves of 20# carbon steel in the mixed solutions with different concentrations of [Bmim]BF₄ at 30 ℃ (a) and 70 ℃ (b)

Fig.6 Polarization curves of 20# carbon steel in the solutions containing the same molar mass of BF₄^-: (a) 30%MEA+5%[Bmim]BF₄ (or 2.43%NaBF₄), (b) 30%MEA+10%[Bmim]BF₄ (or 4.86%NaBF₄), (c) 30%MEA+20%[Bmim]BF₄ (or 9.72%NaBF₄)

Fig.7 EIS curves of 20# steel immersed in the mixed solution for 0.5 h at 30 ℃ (a) and 70 ℃ (b)

Fig.8 Equivalent circuits for fitting EIS of 20# steel immersed in the mixed solutions without (a) and with (b) [Bmim]BF₄ for 0.5 h

Table 3 Fitting impedance parameters of 20# carbon steel in the mixed solutions with different concentrations of [Bmim]BF₄ for 0.5 h at 30 and 70 ℃

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