Synergistic Inhibition Effect of Imidazoline Ammonium Salt and Three Anionic Surfactants in CO2-saturatedBrine Solution

doi:10.11902.1005.4537.2014.157

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (6): 496-504 DOI: 10.11902.1005.4537.2014.157

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Synergistic Inhibition Effect of Imidazoline Ammonium Salt and Three Anionic Surfactants in CO₂-saturatedBrine Solution

Chen ZHANG¹,Jingmao ZHAO^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 University of Chemical Technology, Beijing 100029, China

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Abstract

： The synergistic inhibition effect of imidazoline ammonium salt (IAS) and three anionic surfactants on corrosion of Q235 carbon steel in CO₂ saturated brine solution was studied by using mass loss method, potentiodynamic polarization measurements and molecular dynamics (MD) simulation. It is found that in CO₂ saturated brine solution, there exists a good synergistic inhibition effect between IAS and sodium dodecyl sulfonate (SDSH), and the most significant synergistic inhibition with an inhibition efficiency of 88.5% occurs when the concentration ratio of them is 1:1. The synergism also occurs when using IAS together with sodium dodecyl benzene sulfonate (SDBS). However the antagonism occurs between IAS and sodium dodecyl sulfate (SDSL). Good corrosion inhibition on Q235 carbon steel is also found when only one of the three anionic surfactants is used. The factors affecting the synergism between IAS and the three surfactants were conjectured using molecular simulation.

Key words: CO2 corrosion adsorption synergism antagonism molecular simulation

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Chen ZHANG,Jingmao ZHAO. Synergistic Inhibition Effect of Imidazoline Ammonium Salt and Three Anionic Surfactants in CO₂-saturatedBrine Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(6): 496-504.

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https://www.jcscp.org/EN/10.11902.1005.4537.2014.157 OR https://www.jcscp.org/EN/Y2015/V35/I6/496

Fig.1 Molecular formula of IAS (a), SDBS (b), SDSH (c) and SDSL (d)

Fig.2 Diagrams of three models: (a) equilibrium adsorption configuration of single IAS and six anionic surfactant molecules on metal surface; (b) model for calculating the interaction of single IAS and single surfactant molecules; (c) model for calculating free volume fraction

Fig.3 η and S curves in CO₂-saturated 3.5%NaCl solutions with different concentrations of inhibitors: (a) IAS; (b)SDSH and IAS/SDSH; (c) SDBS and IAS/SDBS; (d) SDSL and IAS/SDSL

Fig.4 Polarization curves of Q235 steel in CO₂-saturated 3.5%NaCl solutions with different concentrations of inhibitors: (a) IAS, SDSH and IAS/SDSH; (b) IAS, SDBS and IAS/SDBS; (c) IAS, SDSL and IAS/SDSL

Table 1 Electrochemical parameters of Q235 steel in CO₂-saturated 3.5%NaCl solutions with differentconcentrations of inhibitors

Fig.5 Distribution diagrams of HOMO and LUMO orbits of SDSH (a), SDBS (b) and SDSL (c) (HOMO: blue and yellow; LUMO: green and red)

Table 2 E_HOMO, E_LUMO and △E of surfactant molecules

Table 3 FFV values in different systems

Fig.6 Equilibrium adsorption configurations on Fe (001) surface for single IAS and six SDBS (a), SDSH (b) and SDSL (c)

Fig.7 Concentration distribution curves of H₂O molecules on Fe (001) surface

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