1‐Vinyl‐3‐allyl Imidazolium Bromide as a New Corrosion Inhibitor for Carbon Steel in 1 M HCl Solution. Issue 43 (16th November 2020)

• Record Type: Journal Article
• Authors: Li, Meng; Chen, Yun; Yang, Wenzhong
• Is Part Of: ChemistrySelect. Volume 5:Issue 43(2020)
• Page Start: 13511
• Page End: 13523
• Publication Date: 2020-11-16
• Subjects: Acid corrosion -- Carbon steel -- Inhibitor -- SEM -- XPS; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202000446
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: The performance of 1‐vinyl‐3‐allyl imidazolium bromide ([VAIM][Br]) for inhibiting the corrosion of carbon steel in 1 M HCl solution from 298 K to 338 K was assessed. Electrochemical impedance spectroscopy (EIS) measurements proved that the inhibition efficiency ( η ) of [VAIM][Br] was as high as 95 %, and after immersion of 144 h, η still kept more than 90 %. Polarization curve verified that [VAIM][Br] acted as a mixed‐type inhibitor and adsorption of [VAIM][Br] was found to obey Langmuir adsorption isotherm. Molecular dynamic simulations suggested that the addition of vinyl group increased interaction energy between [VAIM] + and (0 0 1) plane of Fe from 43.92 kcal mol −1 to 71.98 kcal mol −1 . Liquid chromatography‐mass spectrometry (LC‐MS) and UV‐vis spectrum demonstrated that [VAIM][Br] and Fe atom can form stable complex (Fe2 (VAIM)2 Br4 ), which hindered the corrosion of carbon steel. Abstract : The corrosion behavior of carbon steel in 1 M HCl solution was obviously inhibited when the concentration of the 1‐vinyl‐3‐allyl imidazolium bromide ionic liquid was only 5.0 mM, which was synthesized from 1‐vinylimidazole and allyl bromide in a green way. Experimental results and theoretical studies indicated 1‐vinyl‐3‐allyl imidazolium bromide could form an excellent suppression layer on the carbon steel surface, which was indeed due to the presence of vinyl group in the molecular structure.