Anticorrosion performance of grape seed proanthocyanidins extract and Tween-80 for mild steel in hydrochloric acid medium

Grape seed proanthocyanidins extract (GSPE) is extracted from grape seeds, the waste of the grape consumption, based on a three-level three-factor response surface methodology (RSM). An eco-friendly corrosion inhibitor composed of GSPE and Tween-80 has been developed for mild steel in 1 M hydrochloric acid, whose inhibition performance is evaluated by using weight loss test, electrochemical investigations, and surface morphology analysis. The mixture of GSPE and Tween-80 mixture improves the corrosion inhibition of mild steel compared to individual inhibitors (i.e., 96.48% versus 77.68%/88.57%), reflecting a synergistic action between GSPE and Tween-80. Adsorption isotherm and kinetic parameters indicate that the adsorption follows Langmuir isotherm, and involves both physisorption and chemisorption. Potentiodynamic polarization (PDP) study shows that the GSPE-Tween-80 mixture acts as a mixed type inhibitor and mainly inhibits the anodic process. Surface morphology by scanning electron microscope (SEM), energy dispersive x-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) help to confirm the presence of the GSPE-Tween-80 mixture on the mild steel surface. Quantum chemical (QC) calculation and molecular dynamics (MD) simulations studies further supported the experimental results. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The mixture of GSPE and Tween-80 as an eco-friendly corrosion inhibitor shows excellent inhibition performance for mild steel in 1M hydrochloric acid, with the inhibitory effect verified through various experimental methods. The study found that this mixture can enhance the corrosion inhibition of mild steel, achieving an inhibition rate of 96.48%, and the mechanism of action was determined through adsorption isotherms and surface analysis.