Corrosion Behavior of 3A21 Aluminum Alloy in Ethylene Glycol-water Solution

The electrochemical corrosion behaviors of 3A21 aluminum alloy in ethylene glycol-water solutions at different temperatures, concentrations and immersion times were studied by electrochemical methods. The surface characteristics and corrosion products were examined by scanning electron microscopy (SEM). It was found that with increasing the ethylene glycol concentration, the corrosion rate of the aluminum alloy decreased, and with increasing the temperature, the corrosion rate of the alloy increased. With increasing the immersion time, the formation and dissolution of oxide film on the alloy achieved dynamic equilibrium, and pitting appeared at the weak areas on the oxide film. The development of pitting was accompanied by pitting self-healing and pitting aggravation.