Relationship between Structure of Imidazoline Derivates with Corrosion Inhibition Performance in CO2/H2S Environment

doi:10.11902/1005.4537.2016.010

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (2): 142-147 DOI: 10.11902/1005.4537.2016.010

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Relationship between Structure of Imidazoline Derivates with Corrosion Inhibition Performance in CO₂/H₂S Environment

Jingmao ZHAO^1,²(

),Qifeng ZHAO¹,Riujing JIANG^1,²

1 College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2 Beijing University of Chemical Technology, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing 100029, China

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Abstract

Four oleic acid-based imidazoline derivates with different hydrophilic groups were synthesized in this work. The performance of the synthesized products, such as the hydrophobicity and hydrophily, the adsorption and corrosion inhibition on the 20# carbon steel in flow CO₂/H₂S environment were assessed by means of measurements of contact angle, AFM force curve and mass loss, as well as molecular dynamics simulation. The results showed that under static conditions the imidazoline derivate with two amino ethylene units processes the best inhibition efficiency of 86.8% for the dosage of 100 mg/L, while under high flow rate (5.5 m/s), the inhibition efficiency of imidazoline with three amino ethylene units was the highest, i.e. 73.6% for the dosage of 100 mg/L. The hydrophobicity, adhesion force and adsorption energy of imidazolines were enhanced gradually with the increase of the number of amino ethylene unit.

Key words: CO₂/H₂S imidazoline derivate hydrophilic group flow velocity contact angle AFM MD

Received: 10 January 2016

Fund: Supported by National Natural Science Foundation of China (51171013)

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Cite this article:

Jingmao ZHAO,Qifeng ZHAO,Riujing JIANG. Relationship between Structure of Imidazoline Derivates with Corrosion Inhibition Performance in CO₂/H₂S Environment. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 142-147.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.010 OR https://www.jcscp.org/EN/Y2017/V37/I2/142

Fig.1 Molecular structures of the four imidazoline derivatives

Table 1 Contact angles of H₂O on the samples adsorpted by imidazoline derivates

Fig.2 Force curves of the surfaces of the samples adsorpted by imidazoline derivates

Fig.3 Corrosion rates of 20# carbon steel at different flow rates

Fig.4 Inhibition efficiencies of four imidazoline derivatives at different flow rates

Fig.5 Variations of the inhibition efficiencies of imidazoline derivatives with contact angle (a) and adhesion force (b) at different flow velocities

Fig.6 Equilibrium adsorption configurations of four imidazoline derivatives: (a) IM, (b) IM-2, (c) IM-3, (d) IM-4

Table 2 Adsorption energies of four imidazoline derivatives on Fe

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