Adsorption, thermodynamic, and quantum chemical investigations of an ionic liquid that inhibits corrosion of carbon steel in chloride solutions

Abstract

The purpose of this work lies in the use of ionic liquids as corrosion inhibitors due to the difficulty in some oil fields with the solubility of corrosion inhibitors and these materials can be miscible with water and thus provide a solution to such problems in the industry. The second purpose is concerned with the lower toxicity of these compounds compared with the most common corrosion inhibitors. The study covered the corrosion inhibition performance of the ionic liquid 1-butyl-3-methylimidazolium trifluoromethyl sulfonate ([BMIm]TfO) for carbon steel in 3.5% NaCl solutions. The study comprised electrochemical, adsorption, and quantum chemical investigations. The results manifested that [BMIm]TfO can be considered a promising corrosion inhibitor and the inhibition efficacy intensifies as the concentration rises. The observed inhibitive effect can be correlated to the adsorption of the ionic liquid species and the creation of protecting films on the surface. The mode of adsorption follows the Langmuir adsorption isotherm. The polarization results showed that the ionic liquid [BMIm]TfO functions as a mixed inhibitor. Reliance of the corrosion influence on the temperature in the existence and absence of [BMIm]TfO was demonstrated in the temperature range of 303–333 K using polarization data. Activation parameters were determined and discussed. The observed inhibition performance of [BMIm]TfO was correlated with the electronic properties of the ionic liquid using a quantum chemical study.

Vicia faba peel extracts bearing fatty acids moieties as a cost-effective and green corrosion inhibitor for mild steel in marine water: computational and electrochemical studies

“…Pure metals undergo an electrochemical reaction when exposed to a salty media, which results in the formation of chemically more stable compounds such as oxide, hydroxide, or sulfide [16][17][18][19] . This makes the process thermodynamically plausible and since it is useful in a wide variety of technical applications, mild steel is used in many different industries, including the automotive, aerospace, petroleum production and refining, maritime application, chemical, and military sectors 20 . In a solution containing 3.5% NaCl, the metal loss is rather considerable in a short amount of time, and we can gravimetrically assess very fast whether or not an inhibitor effect is there 21 .…”

Cost-effective and green additives of pozzolanic material derived from the waste of alum sludge for successful replacement of portland cement

“…Along with the inherent properties of these combinations, in which the pH values were recorded at the neutral level, which decreased the corrosive influence of the surrounding mild steel medium since the water content of cement will decrease with time, which will result in a reduction in the corrosion rates by diminishing the direct contact between the mild steel surface and the surrounding environment. Both factors will contribute to a reduction in the overall corrosion rates [65][66][67] . The presence of mild steel in this medium makes it less corrosive than it otherwise would be as a result, the pace at which corrosion occurs slows down; this was proved by the gained results that were provided earlier in the discussion.…”

In-Depth Insight into Corrosion Inhibition Performance of Sweet Potato Leaf Extract as a Green and Efficient Inhibitor for 6N01 Al Alloy in the Seawater: Experimental and Theoretical Perspectives

“…Compared to the Freundlich and Temkin adsorption isotherms (Figure S3), Langmuir adsorption isotherm has a higher R 2 value (>0.9999) (Table ). This means that the adsorption process of SPL on the Al alloy surface belongs to the Langmuir adsorption isotherm model, , in which the SPL forms the monolayer adsorption without lateral interaction between each other . In addition, from the intercept of Figure , the K ads value can be obtained as listed in Table .…”

“…This means that the adsorption process of SPL on the Al alloy surface belongs to the Langmuir adsorption isotherm model, 46,47 in which the SPL forms the monolayer adsorption without lateral interaction between each other. 48 In addition, from the intercept of Figure 7, the K ads value can be obtained as listed in Table 3. The K ads value of SPL at 25 and 45 °C is 221 and 108 L g −1 , respectively, which reflects that the adsorption activity of SPL decreases at high temperatures.…”