Abstract
Environmental pollution is a current global concern. Cleaning of petroleum pipes involve 15% hydrochloric acid (HCl) treatment. Metal corrosion because of acid treatment is a common problem in petroleum industry. Chemical anticorrosive agent can be used but trigger environmental concerns. Therefore, use of waste material as green anticorrosive agent is a preferable solution to corrosion of petroleum grade steel. In current study waste from Punica granatum fruit peel was used to prevent corrosion of stainless steel 410 (SS-410) in presence of 15% HCl. Potentiodynamic polarization study revealed maximum 91.79 % corrosion inhibition efficiency of Punica granatum fruit peel extract at 4 g/L in 15% HCl solution. P. granatum peel extract showed anodic type of inhibition. The adsorption of the peel extract of P. granatum on the SS-410 surface was evident from scanning electron microscopy, atomic force microscopy and X-rays diffraction studies. The P. granatum peel extract formed a monolayer on the surface of SS-410 as it followed Langmuir adsorption isotherm. Theoretical and computational studies confirmed that Quercetin was main phytochemical responsible for the anti-corrosive effect. The interaction between Quercetin and SS-410 surface interactions was studied by Molecular simulation studies. Overall P. granatum peel extract possessed anti-corrosive behaviour against SS-410 surface in 15% hydrochloric acid.
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