CORROSION RESISTANCE OF DIFFERENT ALUMINUM ALLOYS IN ETHANOL

摘要

The aim of this work is to study the corrosion behavior ofrnAluminum alloys with silicon and magnesium, byrnpotentiodynamic polarization tests and ElectrochemicalrnImpedance Spectroscopy in bioethanol solution (92º - 96º), roomrntemperature and pH 6.5, evaluating the effects of the addition ofrnCH_3COOK and ClO_4Li as supported electrolytes. The resultsrnshow that adding ClO_4Li to the alcoholic solution induces pittingrncorrosion, possibly reducing ClO_4~- to Cl~-. Whereas that,rnCH_3COOK causes inhibition of the corrosion, and increasing ofrnpassivation of the metal, a phenomenon which is attributable tornthe generation of corrosion products.