Evaluation of corrosion behaviour of aluminum in different environment

Abstract

The corrosion behaviour of aluminum in hydrochloric, nitric, sulfuric and phosphoric acids was investigated using weight loss method. The results shows that the corrosion rate of aluminium in HCl, H₃PO₄, H<₂SO₄ and HNO₃ are 39.1200, 1.5000, 0.7111 and 0.6500 mg cm^-2h^-1 respectively. The corrosion rate was found to increase with increase in concentration and temperature. The thermodynamic and kinetic parameters were evaluated and enthalpy AH was found to be positive indicating the endothermic nature of the reactions. The study further reveals that the rate of corrosion in different environment follows the following order. HCl > H₃PO₄ > H<₂SO₄ > HNO₃

Keywords: aluminum, weight loss, corrosion rate, thermodynamic and kinetic parameters