Corrosion Inhibition of Q235 Steel in HCl Solution by Brönsted Acid Ionic Liquid

doi:10.11902/1005.4537.2014.181

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (5): 400-406 DOI: 10.11902/1005.4537.2014.181

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Corrosion Inhibition of Q235 Steel in HCl Solution by Brönsted Acid Ionic Liquid

Mingli LI^1,²,Dan LIU²,Shuyun CAO²,Kun PENG¹,Ping LIANG³,Yanhua SHI³,Jianzhou GUI^1,²(

),Feng LIU³

1. Division of Chemistry, Chemical Engineering and Environment, Liaoning Shihua University, Fushun 113001, China
2. School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
3. College of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China

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Abstract

The inhibition effect of Brönsted acid ionic liquids (BAIL) 1-methyl-3-(4-sulfonic acid) butyl imidazolium hydrogen sulfate ([(CH₂)₄SO₃HMIm][HSO₄]) on the corrosion of Q235 steel in 0.5 mol/L HCl solution was investigated by electrochemical measurements. The results showed that the BAIL could suppress the corrosion process of Q235 steel in HCl solution at 25 ℃ through adsorption. The inhibition efficiency increased with the increasing concentration of BAIL in the range 0~14 mmol/L, but decreased with the increasing concentration of BAIL in the range 14~16 mmol/L. The best inhibition efficiency was 80.7% for the solution with 14 mmol/L BAIL. The potentiodynamic polarization curves revealed that the BAIL could act as a mixed-type inhibitor. SEM observation of Q235 surface showed that the adsorption of inhibitor molecules on Q235 surface could form a film of BAIL, and which could prevent both the hydrogen evolution and iron dissolution. This inhibition mechanism was proved further by the results of XPS analysis.

Key words: inhibitor electrochemical measurement Brönsted acid ionic liquid Q235 steel

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	Mingli LI
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	Kun PENG
	Ping LIANG
	Yanhua SHI
	Jianzhou GUI
	Feng LIU

Cite this article:

Mingli LI, Dan LIU, Shuyun CAO, Kun PENG, Ping LIANG, Yanhua SHI, Jianzhou GUI, Feng LIU. Corrosion Inhibition of Q235 Steel in HCl Solution by Brönsted Acid Ionic Liquid. Journal of Chinese Society for Corrosion and protection, 2015, 35(5): 400-406.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.181 OR https://www.jcscp.org/EN/Y2015/V35/I5/400

Fig.1 Molecular structure of IL

Fig.2 Nyquist plots of Q235 steel in 0.5 mol/L HCl solutions containing different concentrations of IL

Fig.3 Electrochemical equivalent circuit model for

fitting the impedance spectroscopies

Table 1 Electrochemical parameters obtained from Nyquist plots

Fig.4 Potentiodynamic polarization curves for Q235 steel in 0.5 mol/L HCl solutions containing different concentrations of IL

Table 2 Electrochemical parameters obtained from the potentiodynamic polarization curves

Fig.5 SEM images of the surface of Q235 steel before (a) and after immersion in 0.5 mol/L HCl solution (b) and 0.5 mol/L HCl+14 mmol/L IL solution (c)

Fig.6 XPS spectra of the surface of Q235 steel samples immersed in 0.5 mol/L HCl soultion without (a) and with (b) 14 mmol/L IL solution

Fig.7 XPS spectra of Fe2p (a), O1s (b), Cl2p (c), C1s (e), N1s (e) and S2p (f) for Q235 steel after immersion in 0.5 mol/L HCl soultions with and without IL

Fig.8 Corrosion inhibition mechanism of IL on Q235 steel surface

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