CO2 Corrosion Inhibition of Carbon Steel by Dodecylamine under Flow Conditions

doi:10.11902/1005.4537.2016.121

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (6): 645-651 DOI: 10.11902/1005.4537.2016.121

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CO₂ Corrosion Inhibition of Carbon Steel by Dodecylamine under Flow Conditions

Hongwei LIU¹,Fuping XIONG¹,Yalin LV¹,Chengxuan GE¹,Hongfang LIU^1,²(

),Yulong HU³

1. Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2. Shenzhen Institute of Huazhong University of Science and Technology, Shenzhen 518000, China
3. College of Science, Naval University of Engineering, Wuhan 430033, China

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Abstract

The corrosion inhibition of dodecylamine on carbon steel in NaCl solution with continuous aeration of CO₂ was studied by means of a rotating disk with electrochemical methods. Results show that the inhibition efficiency of dodecylamine can reach 93.44% with the inhibitor dose of 60 mg/L in the solution. In the blank NaCl solution without inhibitor, the corrosion rate of the steel increases with the increase of the rotation speed. In the solution with the inhibitor dose of 80 mg/L, the corrosion rate of the steel reaches the highest by rotation speed 500 r/min, and then the lowest by 2000 r/min. The corrosion behavior of carbon steel has changed obviously in the presence of inhibitor. The corrosion rate increases with the increase of inhibitor dose, and the inhibition efficiency can reach 87.93% in the presence of inhibitor dose of 80 mg/L by 1500 r/min.

Key words: CO₂ corrosion Q235 carbon steel inhibitor flow condition

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	Hongwei LIU
	Fuping XIONG
	Yalin LV
	Chengxuan GE
	Hongfang LIU
	Yulong HU

Cite this article:

Hongwei LIU,Fuping XIONG,Yalin LV,Chengxuan GE,Hongfang LIU,Yulong HU. CO₂ Corrosion Inhibition of Carbon Steel by Dodecylamine under Flow Conditions. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 645-651.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.121 OR https://www.jcscp.org/EN/Y2016/V36/I6/645

Fig.1 Molecular structure of dodecylamine

Fig.2 Contact angles of the solutions containing different concetrations of inhibitor on Q235 carbon steel: (a) 0 mg/L; (b) 25 mg/L; (c) 50 mg/L; (d), 100 mg/L; (e), 200 mg/L; (f), 400 mg/L; (g), 600 mg/L; (h), 800 mg/L

Fig.3 Variation of contact angle with the concentration of inhibitor

Fig.4 Polarization curves (a) and the fitted corrosion current density and calculated inhibition efficiency as a fuction of inhibitor concentration (b)

Fig.5 Polarization curves of Q235 steel in the solutions without (a) and with (b) inhibitor under the conditions of different rotation speeds

Fig.6 Corrosion current density vs rotation speed curves obtained by fitting polarization curves of Q235 in Fig.5

Fig.7 Polarization curves (a) and fitted results (b) of Q235 steel in the solution with different concentrations of inhibitor at the rotation speed of 1500 r/min

Fig.8 EIS of Q235 steel in the solutions without (a) and with (b) inhibitor at different rotation speeds

Fig.9 Equivalent circuits simulating experimental impedance diagrams in Fig. 8 with one time constant (a) and two time constants (b)

Fig.10 Fitted results of EIS for Q235 in 3%NaClsolutions with and without inhibitor

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