Corrosion Inhibition of Poly N-vinyl Imidazole for Q235 Steel in HCl Solution

doi:10.11902/1005.4537.2014.202

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (1): 55-60 DOI: 10.11902/1005.4537.2014.202

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Corrosion Inhibition of Poly N-vinyl Imidazole for Q235 Steel in HCl Solution

DING Qichen, CHEN Shang(

)

College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China

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Abstract

Poly N-vinylimidazole (PVI) was synthesized using N-vinyl imidazole as monomer and azodiisobutyronitrile (AIBN) as initiator in a solvent of benzene. Its corrosion inhibition for Q235 carbon steel in HCl solution were investigated by means of mass loss method, Tafel polarization measurement and electrochemical impedance spectroscopy (EIS). Results indicate that inhibition efficiency of PVI can reach 90.1% in 1 molL^-¹ hydrochloride acidwith 2 mgL^-¹ PVI at 298 K, and it can reach above 84% at high temperature (328 K) in solution of high acidity (2 molL^-¹). The electrochemical measurements suggest that PVI is a kind of mixed type inhibitor, the adsorption of PVI on the surface of metal obeys the Langmuir adsorption isotherm, free energies of adsorption calculated indicate that PVI exhibits strong tendency of adsorption on metal via chemical adsorption.

Key words: poly N-vinyl imidazole corrosive inhibitor Q235 carbon steel

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Cite this article:

DING Qichen, CHEN Shang. Corrosion Inhibition of Poly N-vinyl Imidazole for Q235 Steel in HCl Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(1): 55-60.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.202 OR https://www.jcscp.org/EN/Y2015/V35/I1/55

Fig.1 FTIR spectrum of PVI

Table 1 Mass loss results of Q235 steel in HCl solution containing different concentrations of PVI at 298 K

Fig.2 Tafel polarization curves of Q235 steel in 1 molL^-¹ HCl solution containing different concentrations of PVI at 298 K

Table 2 Polarization parameters for Q235 steel in 1 molL^-¹ HCl containing different concentrations of PVI at 298 K

Fig.3 Nyquist plots of Q235 steel in 1 molL^-¹ HCl solution containing different concentrations of PVI at 298 K

Fig.4 Equivalent circuit fitted for Q235 steel in 1 molL^-¹ HCl solution containing different concentrations of PVI at 298 K

Table 3 Impedance parameters of Q235 steel in 1 molL^-¹ HCl solution with different concentrations of PVI at 298 K

Fig.5 Langmuir adsorption isotherm of Q235 steel in 1 molL^-¹ HCl solution containing different concentrations of PVI at 298 K

Table 4 Thermodynamic parameters for adsorption of 8 mgL^-¹ PVI in 1 molL^-¹ HCl on Q235 steel at different temperatures

Fig.6 SEM images of Q235 steel samples before corrosion (a), after corrosion for 24 h in 1 molL^-¹ HCl solutions without (b) and with (c) 8 mgL^-¹ PVI

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