Abstract: Foam aluminum-epoxy composites with two types of foam aluminum pore size were prepared. The specimens were soaked in the distilled water and seawater respectively. The curves between moisture rate and soaking time were obtained. The effect on the flexural properties of specimens in soak corrosion were studied by three point bending experiment. It was found that the moisture rate of composites increased with the increase of soaking time, and the moisture rates of composites soaking in seawater were higher than that of composites soaking in distilled water. The flexural mechanical properties of foam aluminum-epoxy were greatly reduced by soaking corrosion. The flexural strength and stiffness of specimens with coupling agent were higher than that of specimens without coupling agent. Especially for the composites with foam aluminum pore size of 2 mm, the flexural strength and stiffness increased by 51.7% and 65.4%, respectively. Additionally, the flexural strength and stiffness of specimens with foam aluminum pore size of 1 mm are higher than that of specimens with foam aluminum pore size of 2 mm.
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