N‐methyl‐2‐hydroxyethylammonium oleate ionic liquid performance as corrosion inhibitor for mild steel in hydrochloric acid medium

Abstract

The aim of the present study is to evaluate the performance of N-methyl-2hydroxyethylammonium oleate ([m-2HEA][Ol]) as a corrosion inhibitor for mild steel in a 0.1-mol/L hydrochloric acid solution and also investigate the role of chloride in the inhibition mechanism. This protic ionic liquid (PIL) has formerly shown a high efficiency as a corrosion inhibitor in a neutral chloride medium. Electrochemical and weight loss measurements, surface contact angle determination, scanning electron microscopy, and Raman spectroscopy were used to understand the factors that influence the response of the studied inhibitor. Results revealed that [m-2HEA][Ol] behaves as a mixed-type adsorption inhibitor, by blocking cathodic sites and by modifying the activation energy of the anodic reaction, and it can reach up to 94-97% of inhibition efficiency. PIL adsorption was enhanced by the excess of positive charge of the mild steel. The effect of inhibitor molecule has been discussed to propose a mechanism that explains the inhibitory action of the corrosion inhibitor, pointing out the role of chloride in the inhibition mechanism.

Experimental Study of Poly(1‐Acetamide‐3‐vinylimidazolium Bromide) as a Corrosion Inhibitor for N80 Carbon Steel in HCl

“…[43] In Table 2, the anodic (β a ) Tafel slopes, associated with the N80-CS dissolution (Fe!Fe 2 + + 2e À ), decreases markedly, suggesting that the N80-CS dissolution process is modified by the PCVIB adsorption, as similar to those reported in previous literature. [6,11,31,44] The reduction in β a may be ascribed to PCVIB that possess the nitrogen-hetercycle with the lone pair electron and the aromatic character, favoring the formation of Fe(II)-PCVIB complex. [6] By contrast, the cathodic (β c ) Tafel slopes could be considered to maintain constant to some extent, when the concentration is varied, proving that the reaction (2H + + 2e À !…”

Next-Generation Lubricity in Deep Drawing: The Synergistic Benefits of PIL and Talc on Water-Based Lubricants

“…Our research group has previously found that PIL m-2HEAOL is an effective lubricant in its pure state [23] and in water-based formulations with talc and bentonite lubricating particles [24,25]. PIL m-2HEAOL also improves corrosion inhibition [26][27][28] and has low toxicity [29]. Despite these positive attributes, this molecule has yet to undergo testing for mechanical forming applications such as stamping.…”

Investigation of the Inhibition Mechanism of Organic Corrosion Inhibitors on the Copper Surface by DFT study and MD simulations

“…[15] There are several ideas concerning the mechanism of corrosion inhibitors, including the soft and hard acid-base theory, passivation theory, and adsorption theory. [16] Furthermore, organic corrosion inhibitors may evenly passivate the metal surface, providing the metal with the best possible protection, whereas inorganic corrosion inhibitors generate a passivating coating that is extremely fractured and porous, causing local corrosion on the metal surface. [17] As a result, organic corrosion inhibitor research has been a popular issue in recent studies.…”