Corrosion Behavior of Aluminum Alloys in Aqueous Solution Containing Ethylene Glycol and NaCl

Abstract

The corrosion test of aluminum alloys has been made in water-ethylene glycol mixture containing NaCl at temperature 40 and 80°C. In aqueous solution without ethylene glycol the pitting corrosion decreases with increase of temperature, while in water-ethylene glycol mixture the maximum depth of the pitting corrosion increases with temperature. In water-ethylene glycol mixture the hydrated oxide film on aluminum alloys becomes relatevely thin and porous. If comparing the pitting corrosion between in aqueous solution and water-ethylene glycol mixture, the ethylene glycol accelerates the glowth of pitting, probably because of its heterogeneous adsorption on the aluminum alloys.