1‐Vinyl‐3‐allyl Imidazolium Bromide as a New Corrosion Inhibitor for Carbon Steel in 1 M HCl Solution

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 À 1 to 71.98 kcal mol À 1. Liquid chromatographymass spectrometry (LC-MS) and UV-vis spectrum demonstrated that [VAIM][Br] and Fe atom can form stable complex (Fe 2 (VAIM) 2 Br 4), which hindered the corrosion of carbon steel.

Synthesis of 1,8-Naphthyridines by the Ionic Liquid-Catalyzed Friedlander Reaction and Application in Corrosion Inhibition

“…Perhaps, this was due to the competitive adsorption of inhibitor molecules on the metal surface. Compared to the previous literature, [1,8-Nap]­[CETSA] and other corrosion inhibitors, such as choline-based and imidazolium-based ILs, showed excellent corrosion inhibition ability at high concentration, but [1,8-Nap]­[CETSA] exhibited better inhibition efficiency when it was at low concentration. − This proves that [1,8-Nap]­[CETSA] ILs have significant application potential in the corrosion protection field.…”

“…Table lists a series of EIS measurement parameters such as the solution resistance ( R s ), charge-transfer resistance ( R ct ), electric double-layer capacitance ( C dl ), and inhibition efficiency (η). Because of inhibitor’s adsorption mode and the difference in surface roughness, a constant-phase element was employed rather than an ideal double-layer capacitor in order to gain a more accurate model . The values of inhibition efficiency and double-layer capacitance were computed from eqs and , respectively …”

“…Because of inhibitor's adsorption mode and the difference in surface roughness, a constant-phase element was employed rather than an ideal double-layer capacitor in order to gain a more accurate model. 42 The values of inhibition efficiency and double-layer capacitance were computed from eqs 5 and 6, respectively. 49…”