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Article

Imidazolium-Based Ionic Liquid as Efficient Corrosion Inhibitor for AA 6061 Alloy in HCl Solution

1
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
2
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(20), 4672; https://doi.org/10.3390/ma13204672
Received: 14 August 2020 / Revised: 14 October 2020 / Accepted: 16 October 2020 / Published: 20 October 2020
(This article belongs to the Special Issue Corrosion of Nonferrous Metals and Their Alloys)
The corrosion inhibition performance of an imidazolium-based ionic liquid (IL), 1-butyl-3-methylimidazolium thiocyanate (BMIm), was studied on AA 6061 alloy in 1 M HCl solution at 303 K, 333 K, and 363 K by gravimetric tests, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) analysis. Scanning electron microscopy with energy dispersive X-ray (SEM-EDX) and X-ray photoelectron spectroscopy (XPS) were used to detect the surface morphologies and chemical composition of the surface films. The results indicate that this IL inhibits AA 6061 corrosion in acid with maximum inhibition efficiencies of 98.2%, 86.6%, and 41.2% obtained at 303 K, 333 K, and 363 K respectively. Inhibition efficiency generally decreased with increasing immersion time; the major exception was at 303 K, whereby the inhibition efficiency was detected to increase with immersion time from 30 to 90 min and then decrease slightly beyond 90 min. The results indicate that BMIm is a mixed-type inhibitor with a predominant effect on cathodic reactions. Surface morphology analyses by SEM revealed less surface damage in the presence of the inhibitor. XPS analysis established the development of a protective film on the AA 6061 surface which was hydrophobic in nature. View Full-Text
Keywords: corrosion inhibition; ionic liquid; AA 6061; XPS corrosion inhibition; ionic liquid; AA 6061; XPS
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MDPI and ACS Style

Wang, X.; Huang, A.; Lin, D.; Talha, M.; Liu, H.; Lin, Y. Imidazolium-Based Ionic Liquid as Efficient Corrosion Inhibitor for AA 6061 Alloy in HCl Solution. Materials 2020, 13, 4672. https://doi.org/10.3390/ma13204672

AMA Style

Wang X, Huang A, Lin D, Talha M, Liu H, Lin Y. Imidazolium-Based Ionic Liquid as Efficient Corrosion Inhibitor for AA 6061 Alloy in HCl Solution. Materials. 2020; 13(20):4672. https://doi.org/10.3390/ma13204672

Chicago/Turabian Style

Wang, Xiaohong, Ailing Huang, Dongquan Lin, Mohd Talha, Hao Liu, and Yuanhua Lin. 2020. "Imidazolium-Based Ionic Liquid as Efficient Corrosion Inhibitor for AA 6061 Alloy in HCl Solution" Materials 13, no. 20: 4672. https://doi.org/10.3390/ma13204672

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