Ionic liquid as an effective green inhibitor for acid corrosion of aluminum composite: experimental and theoretical considerations

Abstract

Results of anticorrosive performance of ionic liquid 1-methyl-1-propyl-piperidinium bromide (MPPB) on corrosion of 6061Al-10vol% SiC composite (Al-MMC) in 0.05 M HCl solution. Electrochemical techniques were adopted to study corrosion and corrosion inhibition rates. Experiments were conducted in the temperature range of 308–323 K by varying concentrations of MPPB. Conditions were standardized to accomplish maximum inhibition efficiency. Kinetic parameters were evaluated. Results were fitted into various adsorption isotherm models and they fitted best into the Langmuir adsorption isotherm. Using data from adsorption isotherms, thermodynamic parameters were calculated. The surface morphology was examined by energy-dispersive X-ray spectroscopy (EDAX), atomic force microscope (AFM), and scanning electron microscope (SEM). FTIR–spectra and X-ray diffraction (XRD) studies were performed to reaffirm the adsorption of MPPB. Adsorption of the inhibitor and mechanistic aspects of corrosion inhibition were supported and supplemented by quantum chemical calculations using density functional theory (DFT). The investigation revealed that percentage inhibition efficiency (% IE) improved with the increase in the concentration of MPPB, while it decreased with a rise in temperature. Maximum efficiency of 60% was observed with 400 ppm MPPB at 308 K. MPPB acted as a mixed inhibitor, obeyed the Langmuir adsorption model, and the mode of adsorption was physisorption. Quantum chemical calculations validated the results of the adsorption study. Graphical abstract

Synthesis of a resorcinol-based derivative as a corrosion inhibitor for low-carbon steel in 0.5 mol L−1 HCl medium: chemical, electrochemical, and theoretical aspects

“…Therefore, water molecules are effectively displaced by DMIH molecules, and the latter are physically adsorbed onto the steel surface. 4 The lower hardness value (0.096) indicates that the DMIH compound is readily absorbed at the steel surface. 5 Another indication that DMIH is an effective corrosion inhibitor is its high global softness value (10.410).…”

“…2,3 It is possible to prevent, or at least minimize, corrosion by using appropriate materials, changing the corrosive environment, using inhibitors, using superior designs, applying coatings, and using cathodic and anodic protection techniques. 4 Low-carbon steel (LCS) is the principal engineering material used to build oil and gas production systems, vessels, and pipelines for transporting water, chemicals, and petroleum products. It is frequently used because of its excellent mechanical characteristics and reasonable price.…”

“… 2,3 It is possible to prevent, or at least minimize, corrosion by using appropriate materials, changing the corrosive environment, using inhibitors, using superior designs, applying coatings, and using cathodic and anodic protection techniques. 4 …”

An electrochemical, and surface studies of synthesized Gemini ionic liquid as corrosion inhibitor for carbon steel in petroleum field

“…8b, representing the optimal configuration carbon steel with 200 ppm of IL-H, exhibit the emergence of the N peak from the ionic liquid inhibitor molecules. This implies that a layer of protective inhibitor has been applied to the surface of the carbon steel, which possesses the ability to effectively protect against the process of metal corrosion 52 . In addition, there was an observed decline in the peaks associated with O and Cl, coupled with increased levels of Fe content.…”