Ionic liquids with two typical hydrophobic anions as acidic corrosion inhibitors

In this study, imidazole derivative-based new ionic liquids were investigated as corrosion inhibitors. These new ionic liquids (ILs) are 1,3-dipropyl-2-(2-propoxyphenyl)-4,5-diphenylimidazole iodide (IL1) and 1,3-dibutyl-2-(2-butoxyphenyl)-4,5-diphenylimidazole iodide (IL2). The corrosion inhibition effects of two new ILs were observed on carbon steel in brackish water media (1% NaCl solution). Carbon steel coupons were exposed to 1% NaCl solution with various concentrations of ILs. Corrosion inhibition effects were tested by the electrochemical impedance spectroscopy (EIS) method and the Tafel method at various temperatures ranging from 25 °C to 55 °C. The results showed that ILs have potential as corrosion inhibitors and the adsorption mechanisms of IL1 and IL2 on carbon steel surfaces were also determined, which followed the Langmuir adsorption isotherm model. Acquisition of ∆Gads values of IL1 and IL2 were −35.04 and −34.04 kJ/mol, respectively. The thermodynamic data of the ILs show that semi-chemical and or physical adsorptions occurred on carbon steel surfaces.

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Role of Ionic Liquids as Green and Ecological Corrosion Inhibitors

Encyclopedia of Ionic Liquids ◽

10.1007/978-981-10-6739-6_92-1 ◽

2019 ◽

pp. 1-6

Author(s):

Yujie Qiang ◽

Liping Wang

Keyword(s):

Ionic Liquids ◽

Corrosion Inhibitors

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Tribological and corrosive properties of ionic liquids containing triazole functional groups

Industrial Lubrication and Tribology ◽

10.1108/ilt-04-2013-0045 ◽

2015 ◽

Vol 67 (3) ◽

pp. 210-215 ◽

Cited By ~ 8

Author(s):

Jinlong Li ◽

Dongmei Li ◽

Feng Zhou ◽

Dapeng Feng ◽

Yanqiu Xia ◽

...

Keyword(s):

Ionic Liquids ◽

Friction Coefficient ◽

Corrosion Inhibitors ◽

Elevated Temperatures ◽

Single Component ◽

Wear Volume ◽

Wear Property ◽

Content Type ◽

Base Oils ◽

Sulfur Containing

Purpose – The aim of this paper was to inhibit the serious corrosion of conventional ionic liquids, a series of new ionic liquids (ILs) containing the triazole functionality, as the anti-corrosion groups were synthesized in this work. Design/methodology/approach – It is well known that nitrogen and sulfur containing organic compounds have been traditionally used as corrosion inhibitors. Among them, triazole derivatives are most often used as corrosion inhibitors. To alleviate the corrosion of the ILs and further improve the anti-wear property, the authors prepared a series of imidazolium ILs modified with the triazole functionality in the present study. Findings – The corrosion behavior of the ILs was evaluated with the iron disk corrosion test and their tribological properties were investigated on an Optimol SRV IV oscillating friction and wear tester at elevated temperatures. The results showed that the ILs with the triazole functionality could effectively reduce the corrosion and exhibit a smaller friction coefficient and wear volume than the unmodified counterpart. The ILs containing the triazole functionality can be used as the single component anti-corrosion base oils even at elevated temperatures. Originality/value – The results showed that the ILs with the triazole functionality could effectively reduce the corrosion and exhibit a smaller friction coefficient and wear volume than the unmodified counterpart. The ILs containing the triazole functionality can be used as the single component anti-corrosion base oils even at elevated temperatures.

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Cation Effect in the Corrosion Inhibition Properties of Coumarate Ionic Liquids and Acrylic UV-Coatings

Polymers ◽

10.3390/polym12112611 ◽

2020 ◽

Vol 12 (11) ◽

pp. 2611

Author(s):

Esther Udabe ◽

Anthony Sommers ◽

Maria Forsyth ◽

David Mecerreyes

Keyword(s):

Ionic Liquid ◽

Ionic Liquids ◽

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Mild Steel ◽

Corrosion Inhibition ◽

Polymer Coating ◽

Corrosion Inhibitors ◽

Electrochemical Impedance ◽

Polymer Coatings

Chromate free corrosion inhibitors are searched for to mitigate the economic loss caused by mid-steel corrosion. Here, we show metal-free organic inhibitors having free coumarate anions that can be used either as direct corrosion inhibitors or incorporated into a polymer coating obtained by UV-curing. Four different ionic liquid monomers and polymer coatings with hexoxycoumarate anion and different polymerizable counter cations were investigated. Potentiodynamic polarization, electrochemical impedance spectroscopy, and surface analyses have verified their corrosion inhibition performance on a mild steel AS1020 surface. In the case of the coumarate ionic liquid monomers, the most promising inhibitor is the one coupled with the ammonium cation, showing an inhibition efficiency of 99.1% in solution followed by the imidazolium, pyridinium, and anilinium. Next, the ionic liquid monomers were covalently integrated into an acrylic polymer coating by UV-photopolymerization. In this case, the barrier effect of the polymer coating is combined with the corrosion inhibitor effect of the pendant coumarate anion. Here, the best polymer coatings are those containing 20% imidazolium and pyridinium cations, presenting a greater impedance in the EIS (Electrochemical Impedance Spectroscopy) measurements and less evidence of corrosion in the scribe tests. This article shows that the cationic moiety of coumarate based ionic liquids and poly(ionic liquid)s has a significant effect on their excellent corrosion inhibition properties for a mild steel surface exposed to aqueous chloride solutions.

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