Arbaj Khan, Sushma Singh, Shagufta Parveen, Harish Chandra Prajapati and Shailendra Yadav
Abstract
This study explores the green synthesis, characterization, and corrosion inhibition properties of two novel heterocyclic compounds, 8-((2-(3-hydroxybenzyl) hydrazineyl)methyl)-4-methyl-2H-chromen-7-ol (HHMC) and 7-(3-hydroxybenzyl)-4-methyl-8,9-dihydropyrano[2,3-e]indazol-2(7H)-one (HBPI). HHMC was synthesized via microwave-assisted reaction while HBPI by cyclization and characterized using elemental analysis, IR, H¹ NMR, and C¹³ NMR spectroscopy. The corrosion inhibition efficiencies of HHMC and HBPI for mild steel in 1N H2SO4 were evaluated using weight loss measurements, scanning electron microscopy (SEM), and potentiostatic polarization techniques. Weight loss studies revealed that both inhibitors significantly reduced corrosion rates, with HBPI demonstrating superior inhibition efficiency. SEM analysis confirmed the formation of protective films on the steel surface, with HBPI forming a more robust and effective layer. Polarization studies indicated that both compounds acted as mixed-type inhibitors, suppressing cathodic and anodic reactions, with inhibition efficiency improving with increasing inhibitor concentration.