Corrosion Inhibition of Octyl Isoquinolinium Bromide on Q235 Carbon Steel in HCl Solution

doi:10.11902/1005.4537.2015.123

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (3): 245-252 DOI: 10.11902/1005.4537.2015.123

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Corrosion Inhibition of Octyl Isoquinolinium Bromide on Q235 Carbon Steel in HCl Solution

Chunxia WANG,Jingping CHEN,Xiaohong ZHANG,Chengyin WANG(

)

College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China

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Abstract

The corrosion inhibition of octyl isoquinolinium bromide on Q235 carbon steel in HCl solution was studied by means of mass loss test, potentiodynamic polarization curves and electrochemical impedance spectroscopy. The results show that octyl isoquinolinium bromide is a mix-type inhibitor which can inhibit the anodic- and cathodic-reactions. The inhibition efficiency increases with the concentration of inhibitor and decreases with temperature. The adsorption of octyl isoquinolinium bromide on Q235 carbon steel surface accords with Laugmuir isothermal adsorption. The adsorption equilibrium constant K_ads is big, which can explain the strong adsorption ability of inhibitor for the steel.

Key words: carbon steel inhibitor octyl isoquinolinium bromide corrosion rate inhibitionefficiency adsorption

Received: 20 July 2015

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Cite this article:

Chunxia WANG,Jingping CHEN,Xiaohong ZHANG,Chengyin WANG. Corrosion Inhibition of Octyl Isoquinolinium Bromide on Q235 Carbon Steel in HCl Solution. Journal of Chinese Society for Corrosion and protection, 2016, 36(3): 245-252.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.123 OR https://www.jcscp.org/EN/Y2016/V36/I3/245

Fig.1 Molecular structure of octyl isoquinoliniumbromide

Fig.2 Changes of corrosion rate and inhibition efficiencywith the content of inhibitor [C₈iQuin]Br

Fig.3 Corrosion rate and inhibition efficiency as a functionof temperature

Fig.4 Relationship between C/θ and C at different temperatures

Table 1 Thermodynamic parameters of inhibitor [C₈iQuin]Br on the surface of Q235 mild steel at differenttemperatures

Fig.5 Relationship between ?G_ads and T

Fig.6 Arrhenius corrosion curves of Q235 mild steel in 1.00 molL^-1 HCl in the absence and presence ofdifferent concentrations of inhibitor [C₈iQuin]Br

Table 2 E_a and A of corrosion reaction with differentconcentrations of inhibitor [C₈iQuin]Br

Fig.7 Polarization curves for Q235 mild steel in 1.00 molL^-1 HCl in the presence and absence of different concentrations of inhibitor [C₈iQuin]Br

Table 3 Polarization parameters and corresponding inhibition efficiencies for Q235 mild steel in 1.00 molL^-1 HClwithout and with additions of inhibitor [C₈iQuin]Br

Fig.8 Nyquist plots of Q235 mild steel in 1.00 molL^-1 HCl in the presence and absence of different concentrations of inhibitor [C₈iQuin]Br

Fig.9 Equivalent circuit model used to fit the EIS experimental data

Table 4 Impedance date of Q235 mild steel in 1.00 molL^-1 HCl in the presence and absence of different concentrations of inhibitor [C₈iQuin]Br

Fig.10 Surface morphologies of Q235 mild steel immersed for 5 h in 1.00 molL^-1 HCl solutions without (a) and with inhibitor [C₈iQuin]Br (b)

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