Corrosion Behavior of Aluminum Cold Plate in Ethylene Glycol Coolant

In a simulated cooling system, the pH value and aluminum ion concentration of the coolant were monitored, and the corrosion morphology and corrosion products of the cold plate were analyzed, the corrosion behavior of cold plate made by 6063 aluminum alloy in ethylene glycol coolant and the effect of chemical conductive oxidation on the corrosion of 6063 aluminum alloy cold plate were investigated. As a result, the coolant pH value increased during the experiment period, but increased significantly at the early stage, then increased slowly and tended to be stable. Aluminum ions produced by the aluminum matrix corrosion reached a dynamic balance between solubility and precipitation. Moreover, pitting corrosion was the main corrosion form of aluminum cold plate in ethylene glycol coolant, and the corrosion rate decreased with the increase of experiment time, while the corrosion rate of 6063-CCO (chemically oxidated 6063 aluminum alloy) cold plate was lower at the beginning of the experiment, and higher at the later experiment period.