Corrosion inhibition of the new quaternary ammonium salts derivative with 8-Hydroxyquinoline on copper in 0.5M H2SO4 solution

Lei Zulei; TAN Bochuan; QIN Zhongjian; JIANG Lu; XIANG Bin

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Corrosion inhibition of the new quaternary ammonium salts derivative with 8-Hydroxyquinoline on copper in 0.5M H2SO4 solution

Lei Zulei 1,TAN Bochuan 2,QIN Zhongjian 2,JIANG Lu 2,XIANG Bin 2 *

1.College of Chemistry and Chemical Engineering, ChongQing University, ChongQing 401331, PR China;College of Chemistry and Chemical Engineering, ChongQing University, ChongQing 401331, PR China;College of Chemistry and Chemical Engineering, ChongQing University, ChongQing 401331, PR China;College of Chemistry and Chemical Engineering, ChongQing University, ChongQing 401331, PR China;College of Chemistry and Chemical Engineering, ChongQing University, ChongQing 401331, PR China

2.College of Chemistry and Chemical Engineering, ChongQing University, ChongQing 401331, PR China

*Correspondence author

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Funding: none

Opened online: 9 May 2018

Accepted by: none

Citation: Lei Zulei,TAN Bochuan,QIN Zhongjian.Corrosion inhibition of the new quaternary ammonium salts derivative with 8-Hydroxyquinoline on copper in 0.5M H2SO4 solution[OL]. [ 9 May 2018] http://en.paper.edu.cn/en_releasepaper/content/4744754

In this study, four kinds of ionic liquids (ILs) with different carbon chain lengths based on 8-Hydroxyquinoline have been synthesized and used as the corrosion inhibitions for copper in 0.5 M sulfuric acid solution. The data of impedance spectroscopy, polarization curves and scanning electron microscope (SEM) show a positive correlation relationship between inhibitor concentration and inhibition efficiency. Besides, the introduction of alkyl groups in the molecular structure contributes to slow down the corrosion of copper, and inhibition efficiency rises firstly and then declines with the incremental alkyl chain length. The theoretical calculation result is consistent with the abovementioned experiments results. Furthermore, the adsorption of the investigated inhibitors on the copper surface obeys the Langmuir adsorption isotherm.

Keywords:ionic liquids; copper; corrosion inhibitor; Electrochemistry; theoretical calculations

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