Effect of Double Bonds in Hydrophobic Chains on Corrosion Inhibition Performance of Imidazoline Derivates in Dynamic H2S/CO2 Environment

doi:10.11902/1005.4537.2014.247

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (6): 505-509 DOI: 10.11902/1005.4537.2014.247

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Effect of Double Bonds in Hydrophobic Chains on Corrosion Inhibition Performance of Imidazoline Derivates in Dynamic H₂S/CO₂ Environment

Jingmao ZHAO^1,²(

),Xiong ZHAO¹,Ruijing JIANG^1,²

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

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Abstract

Four imidazoline derivates were synthesized using diethylenetriamine with stearic acid, oleic acid, n-docosanoic acid and erucic acid respectively as raw materials. Then the inhibition performance and adsorption capacity on the carbon steel surface and the ability of hydrophobic of the prepared derivates were studied in dynamic H₂S/CO₂ environment by means of dynamic weight loss test, SEM, AFM, contact angle measurement and molecular dynamics simulation. The measurememnt results for contact angle and AFM force showed that the hydrophobic effect is better and the adhesion force is bigger respectively for imidazoline derivatives with double bonds in their hydrophobic chains. The surface adsorption energy of the four imidazoline derivatives on the face of Fe (001) were calculated by using molecular dynamic simulation, the results indicated that the surface adsorption energy of imidazoline which has double bonds in hydrophobic chain was larger than that one without double bonds. The theoretical evaluation of corrosion inhibition performance of four imidazoline derivates accorded well with the experiment results.

Key words: H2S/CO2 environment imidazoline contact angle measurement molecular dynamics simulation

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Jingmao ZHAO,Xiong ZHAO,Ruijing JIANG. Effect of Double Bonds in Hydrophobic Chains on Corrosion Inhibition Performance of Imidazoline Derivates in Dynamic H₂S/CO₂ Environment. Journal of Chinese Society for Corrosion and protection, 2015, 35(6): 505-509.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.247 OR https://www.jcscp.org/EN/Y2015/V35/I6/505

Fig.1 IR spectra of four kinds of imidazoline derivative

Table 1 Corrosion rates of carbon steel after addingdifferent imidazolines in H₂S/CO₂ solution

Table 2 Contact angles of carbon steel adsorpted byimidazoline derivatives

Fig.2 Force curves measured by AFM on the surfaces of the samples with imidazoline inhibitors

Fig.3 SEM images of corrosion products formed in the solutions containing IM-17 (a), IM-17D (b), IM-21 (c) and IM-21D (d)

Fig.4 Adsorption conformations of IM-17 (a), IM-17D (b), IM-21 (c) and IM-21D (d) on Fe surface

Table 3 Adsorption energies of four imidazoline inhibitors on Fe (001)

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