Corrosion Behavior of Metallic Materials in Acidic-Functionalized Ionic Liquids

Abstract

This paper describes the influence of temperature, water content, and anionic type of acidic-functionalized ionic liquids (ILs), 1-(4-sulfobutyl)-3-methylimidazolium hydrogen sulfate ([BsMIM][HSO 4 ]) and 1-(4-sulfobutyl)-3-methylimidazolium toluenesulfonate ([BsMIM][OTs]), on the corrosion behavior of Fe, Ni, and 304 stainless steel (304SS). Electrochemical methods including electrochemical impedance spectroscopy (EIS) and Tafel plots were used to investigate it. Also, scanning electron microscopy (SEM) was used to characterize the nature of the corrosion morphology. The obtained electrochemical results indicated that increasing temperature accelerates the corrosion, while decreasing IL concentration retards the corrosion. The corrosion process is controlled by charge transfer. Moreover, the bisulfate anion (HSO 4 −) has an effect on the corrosion rate more significantly than the p-toluenesulfonate anion (OTs − ) does. The SEM spectrum showed that the corrosion situation of Fe is more serious than Ni and 304SS performed in IL-based solutions, especially in [BsMIM][HSO 4 ]. Also, the protective layer formed on the 304SS surface is more uniform. On the basis of these consistent finds, the corrosion mechanism is assumed.

Efficient Thiolation of Alcohols Catalyzed by Long Chained Acid‐Functionalized Ionic Liquids under Mild Conditions

“…[32] Among them, acidic ionic liquids have been widely used in alkylation, oxidation, esterification and so on and long chained ionic liquids would exhibit surface activity and have certain promoted effect on reactions. [33] In our continuing effort on developing acidic ionic liquids catalyzed reactions, [23,24,[34][35][36][37] we synthesized a series of multifunctionalized ionic liquids derived from pyrrolidine and applied them for the thiolation of alcohols ( Figure 2). Delightedly, the ionic liquids based on pyrrolidine exhibited more efficiency than general ionic liquids based on imidazole, providing up to 99 % yield with [BsCtP][OTf ] as the catalyst at room temperature for 0.25 h (Scheme 1).…”

Enhancing the Corrosion Resistance of Epoxy Coatings by Impregnation with a Reduced Graphene Oxide‐Hydrophobic Ionic Liquid Composite

“…Besides, one of applications for ionic liquid was corrosion inhibition of metals in acid environments. This was because most of efficient inhibitors have heteroatoms such as N, O, S and multiple bonds in their molecules through which they are adsorbed on the metal surface . Therefore, ionic liquids and graphene‐based nano composites were both expected to be promising in anti‐corrosive applications.…”

Green Brönsted acid ionic liquids as novel corrosion inhibitors for carbon steel in acidic medium

“…How about the BAILs? The corrosion behaviour of some BAILs to various metal or alloys is quite different from conventional acid e.g., HCl, H 2 SO 4 13 . We have studied the corrosion behaviour of mild steel in the BAIL 3-methyl-1-(4-sulfonic acid) butyl imidazolium bisulphate previously, and interestingly nice electrochemical passivation to mild steel could be obtained in spite of the acidity of the BAIL 14 .…”