2025-04-01https://repository.covenantuniversity.edu.ng/handle/123456789/38827Studies have been made on the corrosion inhibition of aluminium alloy in 2M HCl and HNO3/Arachis hypogeae natural oil using gravimetric and potentiodynamic polarization techniques at 25oC. The results revealed that Arachis hypogeae oil in 2M HCl and HNO3-aluminium environment decreased the corrosion rate at various concentrations considered. Higher inhibitor efficiency (IE) of 83.48, 96.24 and 95.57% using potentiodynamic polarization methods were demonstrated in HCl solution at 20, 50 and 100%v/v Arachis hypogeae. While an IE of 99.03, 99.94 and 88.55% were recorded at 20, 50 and 100%v/v Arachis hypogeae respectively. The IE using the gravimetric method for both aluminium-HCl/HNO3-Arachis 20, 50 and 100%v/v Arachis hypogeae was significantly enhanced. The scanning electron microscope (SEM) surface morphology of as-corroded uninhibited condition showed severe damage and pits formation than as-corroded inhibited conditions. The additions of Arachis hypogeae as corrosion inhibitor indicate a high potential value, IE and polarization resistance with decreased in current density. The methods for the corrosion assessment of the aluminium were in agreement and a mixed-type corrosion exist which obeyed Langmuir adsorption isothermsapplication/pdfT Technology (General), TJ Mechanical engineering and machineryArticle