浸泡腐蚀对泡沫铝-环氧树脂复合材料弯曲性能的影响

Effect of Soaking Corrosion on Flexural Properties of Foam Aluminum-Epoxy Composites

制备了两种泡沫铝孔径的泡沫铝-环氧树脂复合材料。将试件分别浸泡于蒸馏水和海水中,得出了其吸湿率与浸泡时间的关系曲线。通过三点弯曲实验研究了浸泡腐蚀对复合材料弯曲强度和弯曲刚度等力学性能的影响。研究结果表明:泡沫铝-环氧树脂复合材料的吸湿率随浸泡时间的延长而逐渐增大,且试件在海水中浸泡的吸湿率大于在蒸馏水中的吸湿率。浸泡腐蚀大幅度地降低了泡沫铝-环氧树脂复合材料的弯曲力学性能。添加偶联剂的试件的弯曲强度和弯曲刚度均比无偶联剂试件的值更大,特别是对于泡沫铝孔径为2mm的复合材料试件,添加偶联剂使得其弯曲强度和弯曲刚度分别提高了51.7%和65.4%。另外,1mm孔径泡沫铝复合材料试件的弯曲强度和弯曲刚度均比2mm孔径泡沫铝复合材料试件的值更大。

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.