Abstract
This study focuses on investigating the effect of Terminalia chebula Ritz. extract (TCE) for corrosion inhibition of Al in phosphoric acid (H3PO4) using potentiodynamic polarization (PDP) technique. In this study, the effect of concentration of TCE extract, the concentration of H3PO4 acid medium, and temperature (T) was investigated on the corrosion current density (icorr) and inhibition efficiency (IE). The TCE was characterized by FTIR analysis, and the adsorption of TCE was justified with the help of kinetic, thermodynamic, adsorption isotherm parameters. The surface morphology study was done using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDXS), and atomic force microscopy (AFM). The study also focuses on identifying the optimum process parameters for obtaining the maximum IE by applying the response surface methodology (RSM) and desirability function approach. The maximum IE of 83.24% was achieved at a temperature of 30 ℃, the concentration of TCE extract of 500 ppm, and H3PO4 acid concentration of 0.5 M. Regression analysis, Pareto chart, normal chart, main effect, and interaction effect plots are employed to acquire an in-depth understanding of process variables on IE. The IE obtained from the experiments and the predicted model is in a close match and a high value of the coefficient of determination (R2 = 99.98%) displays that the generated model was able to estimate the IE accurately from the selected process variables.
Highlights
Mild steel and aluminum are the two most commonly used material as it is available and at a lower cost
The rate of corrosion of aluminum increased with an increase in the concentration of H3PO4 corrosive arrangement
Since the present examination targets finding the ideal concentration of inhibitor essential to acquire the highest possible inhibition efficiency (IE), the various concentrations of inhibitor have been utilized in the various concentration if corrosive medium instead of utilizing the same arrangement of inhibitor
Summary
Mild steel and aluminum are the two most commonly used material as it is available and at a lower cost. The legislations and environmental policies enforce restrictions and the installation of residual water treatment plants as a cause of toxic inhibitors, which cause an increment in costs for industries (Fernández 1989) Those circumstances motivate the increase in developing effective and low toxicity chemical substances(Galo et al 2020; Saxena et al 2020; Şahin et al 2020). TCE on the enhancement made to IE of Al in H3PO4 was considered using the central composite design (CCD), RSM, and DFA This methodology of optimization of process empowers the investigation of the impact of individual variables, builds up the connection among factors and operational settings, and forecasts the exhibition at the ideal levels. The working electrode used for the study is the commercially obtained aluminum with the following composition: 99.61% Al, 0.27% Fe, and 0.12% Si. The cylindrical test specimen molded in acrylic material was exposed to a corrosive medium with a surface area of 1.0 cm. The mix of the procedure factors that can achieve an ideal foreseen worth can be obtained
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