Effect of Oxygenated Additives on the Corrosion Behavior of Al-Si-Cu Alloy in Synthetic Condensed Automotive Solution

This work involves studying the effect of adding alcohols on corrosion behavior of al-si-cu alloy in synthetic condensed automotive solution (csas) at room temperature. alcohols used were methanol (meoh), ethanol (etoh), porpanol (propoh), butanol (butoh), and mixture of (meoh-etoh), (meoh-propoh) and (meoh-butoh). according to potentiodynamic polarization test, the results of corrosion resistance indicate that additive alcohols increase the resistance of al-si-cu alloy, except addition of ethanol to the csas and the resistance follows the sequence: meoh. > butoh > meohbutoh > meoh-propoh > propoh > meoh-etoh. cyclic polarization measurements were carried out to estimate the pitting resistance of al-si-cu alloy in csas in the absence and presence of alcohols, this test shows that the hysteresis loop appears only in cases of presence of ethanol and (meoh-etoh) mixture in csas indicating the disadvantage of adding ethanol and (meoh-etoh) mixture to automotive fuel.