Corrosion Inhibition Performance of Triazine-derived Quaternary Ammonium Salts for Q235 Carbon Steel in High Temperature and High Pressure CO2 Containing 3.5%NaCl Solution

doi:10.11902/1005.4537.2025.053

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (6): 1639-1648 DOI: 10.11902/1005.4537.2025.053

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Corrosion Inhibition Performance of Triazine-derived Quaternary Ammonium Salts for Q235 Carbon Steel in High Temperature and High Pressure CO₂Containing 3.5%NaCl Solution

WU Chunsheng¹, ZHANG Tianyong¹, LI Bin¹, YUAN Wenying¹, ZHANG Xiaoou¹, JIANG Shuang¹^,²(

), WANG Huaiyuan¹^,²(

)

1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300354, China
2 Ningbo Key Laboratory of Green Petrochemical Carbon Emission Reduction Technology and Equipment, Ningbo 315000, China

Cite this article:

WU Chunsheng, ZHANG Tianyong, LI Bin, YUAN Wenying, ZHANG Xiaoou, JIANG Shuang, WANG Huaiyuan. Corrosion Inhibition Performance of Triazine-derived Quaternary Ammonium Salts for Q235 Carbon Steel in High Temperature and High Pressure CO₂Containing 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1639-1648.

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Abstract

Amido-group triazine quaternary ammonium salt (CCDY) corrosion inhibitor was synthesized by nucleophilic substitution reaction and quaternary ammonium reaction with trichlorotriazine, dipropylamine and bromoacetamide as raw material. Then which was compounded with thiourea (TU) and sodium tungstate to acquire the complex inhibitor of optimal proportion, which was named CTLY. Next, the corrosion inhibition performance of the complex corrosion inhibitor CTLY for Q235 steel was assessed via static immersion test at 90 ^oC in 0.5 MPa CO₂ containing 3.5%NaCl solution, accord with an orthogonal test arrangement, as well as electrochemical tests, surface morphology analysis and quantum chemical calculations. The results show that the corrosion inhibition rate of CTLY for Q235 steel can reach 96.64%. CTLY conforms to the Langmuir adsorption isothermal formula on the surface of Q235 steel, and the standard adsorption Gibbs free energy (ΔG⁰) is between -20 and -40 kJ/mol, correspondingly which is a mixed adsorption dominated by chemical adsorption. Electrochemical tests showed that CTLY was a mixed inhibitory corrosion inhibitor, while mainly inhibiting the anode reaction. The Nyquist plot shows a single-half arc, and the charge transfer impedance increases significantly with the increase of CTLY concentration. The surface morphology analysis further showed that CTLY had a good corrosion inhibition effect.

Key words: triazine quaternary ammonium salt high temperature and high pressure orthogonal test method CO₂ corrosion inhibitor

Received: 18 February 2025 32134.14.1005.4537.2025.053

ZTFLH:

TG174

Fund: Ningbo Key Laboratory Open Fund(ZITJU2024-ZYDK037)

Corresponding Authors: JIANG Shuang, E-mail: shuangjiang@tju.edu.cnWANG Huaiyuan, E-mail: wanghyjiji@163.com

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	WU Chunsheng
	ZHANG Tianyong
	LI Bin
	YUAN Wenying
	ZHANG Xiaoou
	JIANG Shuang
	WANG Huaiyuan

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.053 OR https://www.jcscp.org/EN/Y2025/V45/I6/1639

Fig.1 Synthesis route of CCDY corrosion inhibitor

Fig.2 FTIR spectrum of CCDY

Fig.3 NMR spectra of CCDY: (a) ¹H, (b) ¹³C

Fig.4 Corrosion inhibition rate of CCDY as a function of its concentration

Fig.5 Corrosion inhibition rates of CCDY inhibitors with different concentrations of TU (a) and Na₂WO₄(b)

Table 1 Main influencing factors of corrosion inhibition performance and their levels (mg·L^-1)

Table 2 Results of L9 (3⁴) orthogonal experiment

Fig.6 Potentiodynamic polarization curves of Q235 steel in 0.5 MPa CO₂ saturated 3.5%NaCl solutions with the presences of CCDY and compound inhibitors at 80 ^oC

Table 3 Fitting results of potentiodynamic polarization curves in Fig.6

Fig.7 Nyquist (a), impedance module (b) and phase angle (c) plots of Q235 steel in 0.5 MPa CO₂saturated 3.5% NaCl solutions containing different concentrations of CTLY, and corresponding equivalent circuit model (d)

Table 4 Fitting parameters of EIS in Fig.7 for Q235 steel

Fig.8 Fitted lines of c/θ-c for CTLY

Table 5 Linear regression parameters of c/θ-c and adsorption thermodynamic parameters for CTLY

Fig.9 Surface SEM micrographs of Q235 steel before (a) and after (b, c) corrosion in 0.5 MPa CO₂ saturated 3.5%NaCl solutions without (b) and with (c) CTLY

Fig.10 3D-AFM surface micrographs of Q235 steel before (a) and after (b, c) corrosion in 0.5 MPa CO₂ saturated 3.5%NaCl solutions without (b) and with (c) CTLY

Table 6 AFM determined surface roughnesses of Q235 steel based on the results in Fig.10

Fig.11 XRD patterns of Q235 steel after corrosion in 0.5 MPa CO₂saturated 3.5%NaCl solutions with (a) and without (b) CTLY

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