Corrosion of Aluminum and Iron in Different Aqueous Media

Abstract

In this research the corrosion behavior of some metals in different acid solutions using weightloss technique were studied. The magnitude of corrosion of these metals in (0.4, 0.6, 0.8, 1 M) solutions of NaCl, HCl, H2SO4, and HNO3 were investigated for an exposure period from3 to 9 days.Rate of corrosion in metals followed this order: iron >aluminum, while rate of corrosion in aqueous media followed this order: HNO3> H2SO4>HCl>NaCl. It has been observed that concentration increases lead to increase the rate of corrosion. Further study on the corrosion kinetics has revealed that the rate of reaction of the metals increases with increase in solution concentration, while the half life decreases with increase of solution concentration. The corrosion behavior of iron and aluminum in the 1M HNO3, 1M H2SO4,1MHCl and 1M NaCl solutions containing various weight of urea and acetanilide range (0.3, 0.5, 1, 1.5 g) at room temperature were investigated, using weight loss measurement, and atomic absorption analysis, to find the amounts of metal in acidic solutions in presence and absence of urea and acetanilide. It is found that the inhibition efficiency (IE) and the corrosion rate increased by increasing the weight of urea and acetanilide. Urea and acetanilide inhibitors acts as a cathodic inhibitor. The results showed that urea caused protection efficiency more than acetanilide because the main functional groups in urea molecule contains two amino groups