Imidazolium-Based Ionic Liquid as Efficient Corrosion Inhibitor for AA 6061 Alloy in HCl Solution

Abstract

The corrosion inhibition performance of an imidazolium-based ionic liquid (IL), 1-butyl-3-methylimidazolium thiocyanate (BMIm), was studied on AA 6061 alloy in 1 M HCl solution at 303 K, 333 K, and 363 K by gravimetric tests, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) analysis. Scanning electron microscopy with energy dispersive X-ray (SEM-EDX) and X-ray photoelectron spectroscopy (XPS) were used to detect the surface morphologies and chemical composition of the surface films. The results indicate that this IL inhibits AA 6061 corrosion in acid with maximum inhibition efficiencies of 98.2%, 86.6%, and 41.2% obtained at 303 K, 333 K, and 363 K respectively. Inhibition efficiency generally decreased with increasing immersion time; the major exception was at 303 K, whereby the inhibition efficiency was detected to increase with immersion time from 30 to 90 min and then decrease slightly beyond 90 min. The results indicate that BMIm is a mixed-type inhibitor with a predominant effect on cathodic reactions. Surface morphology analyses by SEM revealed less surface damage in the presence of the inhibitor. XPS analysis established the development of a protective film on the AA 6061 surface which was hydrophobic in nature.

Performance and Mechanism of Alkylimidazolium Ionic Liquids as Corrosion Inhibitors for Copper in Sulfuric Acid Solution

“…[14,15]. Ionic liquids are popularly used as sustainable and green corrosion inhibitors for metal [5,7,12,[15][16][17][18]. Many researchers used electrochemical tests and surface investigations to obtain the inhibition efficiency and found that the adsorption process of an inhibitor can be described by Langmuir adsorption [19,20].…”

“…They found that the most effective inhibitors have π-systems or multiple bonds, and organic compounds containing O, P, N, or S atoms have a good corrosion performance [20]. But it is very difficult to choose the favorite ILs as effective corrosion inhibitors for a specific application since there are about 10 18 kinds of ionic liquids that can be formed with the present available cations and anions. Fortunately, with the development of computer technology and related theory, in recent years, Savaş et al further applied the quantum chemical study and molecular dynamics (MD) to explore corrosion inhibition mechanisms and corrosion inhibition performance [21].…”

2-Aminobenzothiazole as an efficient corrosion inhibitor of AA6061-T6 in 0.5 M HCl medium: electrochemical, surface morphological, and theoretical study

“…Some of the other reported inhibitors [61,62] showed slightly higher % IE than ABT but at a very low concentration of HCl medium (0.01 and 0.1 M HCl). However, ABT exhibited a lower % IE than two other reported inhibitors [63,64].…”

Inhibition Mechanism of Some Vinylalkylimidazolium-Based Polymeric Ionic Liquids against Acid Corrosion of API 5L X60 Steel: Electrochemical and Surface Studies

“…The N 1s spectrum of the sample evaluated in the presence of PILs (Figure ) reveals the presence of the >CNH + – species at 401.6–402.0 eV. These peaks are attributed to the presence of the imidazolium ring of PILs. ,, The N–H and/or N–Fe bond(s) detected at 399.9 eV ,− is associated with the presence of the amide group of the monomers in the three PILs and/or N–Fe coordination bond(s), respectively. The characteristic C 1s signals of the sample are observed in Figure .…”

“…These peaks are attributed to the presence of the imidazolium ring of PILs. 73 , 75 , 79 The N–H and/or N–Fe bond(s) detected at 399.9 eV 74 , 80 − 84 is associated with the presence of the amide group of the monomers in the three PILs and/or N–Fe coordination bond(s), respectively. The characteristic C 1s signals of the sample are observed in Figure 12 .…”