Effect of Soil Solution of Al madina Al monawara Area on the Corrosion of Aluminum in Acidic media

Aisha M. Turkustani

Volume : VI, Issue : II, February - 2016

Effect of Soil Solution of Al madina Al monawara Area on the Corrosion of Aluminum in Acidic media

Aisha M. Turkustani

Abstract :

 The effect of Soil Solution of Al madina Al monawara Area (SSAA) on the corrosion inhibition of aluminum in 0.5M hydrochloric acid (HCl) was investigated by weight–loss experiments at 30 and 60ºC and electrochemically at 30ºC. The results indicate that SSAA acts as an inhibitor especially at low concentrations in HCl solution. It is found that, the percentage inhibition decreased with increasing the concentration of the inhibitor SSAA until 20%v/v, then it increases with increasing concentration. Potentiodynamic polarization curves indicated that the SSAA behaves as mixed type inhibitor. EIS measurements showed that the dissolution process occurs under activation control. At a concentration of 5%v/v, the percentage inhibition reached about 75.54% at 30ºC and 43.16% at 60ºC, respectively, and at 50%v/v the percentage inhibition equals 70.24% at 30ºC and 52.75% at 60ºC, respectively. The percentage inhibition decreased with the increase of temperature. The thermodynamic parameters for the adsorption of this inhibitor on the metal surface were calculated using the Freundlich adsorption isotherm and physical adsorption mechanism is proposed. SSAA was found to be an excellent potential corrosion inhibitor because of the high content of water, mineral salts such as silicon, aluminum silicate, magnesium silicate, carbonates, aldehydes, sulfides and different iron oxides.