Investigation on anodized 5052 aluminum alloy and its corrosion resistance in simulated acid rain
Junming Gu, Xinying Zhang, Liying Yu
Abstract
5052 Al alloy commonly used for construction structures was anodized from the mixed acid electrolyte of citric acid and sulfuric acid to further improve the durability of Al alloy construction components. Different anodized aluminum alloys were prepared by changing the concentration of citric acid in the electrolyte. The surface morphology, structure, thickness and corrosion resistance of the anodized aluminum alloys were characterized and analyzed. The results show that adding appropriate amount of citric acid has a certain corrosion inhibition effect, which reduces the corrosion dissolution degree of the anodized aluminum alloy. At the same time, adding appropriate amount of citric acid in the electrolyte is beneficial to increase the thickness of anodized aluminum alloy, resulting in the enhancement of corrosion resistance in simulated acid rain. When the concentration of citric acid in the electrolyte is 70 g/L, the anodized aluminum alloy is uniform with higher thickness and better corrosion resistance in simulated acid rain.