Corrosion Behavior of Aluminum Alloy in Simulated Cooling Fluid Composed of Ethylene Glycol and Water

The corrosion behavior of AA6061 aluminum alloy in simulated cooling fluid composed of ethylene glycol-water was investigated by using weight loss test,electrochemical impedance spectroscopy and polarization curve measurement.It was found that the Al alloy experienced two stages of corrosion in the simulated cooling fluid.The Al alloy had a relatively small corrosion rate in the early stage of corrosion,but its corrosion rate rose in follow-up stage of corrosion.In the early stage of corrosion,the adsorption of ethylene glycol on the surface of Al alloy inhibited the corrosion.However,with increasing immersion time,ethylene glycol accelerated the corrosion of the Al alloy.Glycolic acid,one of the decomposed products of ethylene glycol at elevated temperature,contributed to increasing corrosion susceptivity of Al alloy in the simulated cooling fluid.