Investigating the effect of pomegranate peels extract as a corrosion inhibitor in columns and beams of reinforced concrete

Chloride-induced corrosion of embedded steel greatly reduces the longevity of reinforced concrete structures. Under harsh saline conditions, this study examines the efficacy of a sustainable green corrosion inhibitor made from pomegranate peel extract (PPE) in contrast to a traditional organic inhibitor (sodium benzoate). The Soxhlet extraction method was used to obtain PPE, and both inhibitors were added to concrete mixtures at 2% and 4% by weight of cement. Electrochemical methods, including linear polarisation measurements, were used to assess the corrosion behaviour of reinforced steel in concrete beams and columns subjected to 2% and 4% NaCl solutions. The addition of PPE significantly reduced the corrosion rate and corrosion current density (Icorr), especially at higher concentrations, according to the data. Because PPE contains polyphenolic chemicals that can adsorb onto the steel surface and form a protective barrier layer, it showed better inhibitory performance than sodium benzoate. Additionally, because of matrix densification and enhanced microstructural integrity, PPE helped to slightly increase compressive strength. The development of a durable protective layer on the steel surface and a decrease in chloride penetration were verified by microstructural analysis (SEM/EDS). The results show that PPE functions as an effective, economical and environmentally friendly mixed-type corrosion inhibitor.