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采用拉伸测试、晶间腐蚀测试、剥落腐蚀测试和透射电镜分析等方法研究了不同时效状态对新型高强铝合金型材力学和腐蚀性能的影响。结果表明,合金型材在峰时效状态下具有最高的强度,在过时效状态下具有最优的抗腐蚀性能,在欠时效状态下合金的伸长率最高。合金晶间腐蚀和剥落腐蚀敏感性由大到小的顺序为:欠时效>峰时效>过时效。这主要是因为过时效处理后,晶内沉淀相的大量析出提高了基体的电极电位,晶界沉淀相的不连续分布和晶界无析出带(PFZ)结构有效阻断了腐蚀的阳极通道。
Tensile test, intergranular corrosion test, exfoliation corrosion test and transmission electron microscopy analysis were used to study the effect of different aging conditions on the mechanical and corrosion properties of the new high-strength aluminum alloy profiles. The results show that the alloy profiles have the highest strength under peak aging condition and the best corrosion resistance under over aging condition. The elongation of the alloy under the aging condition is the highest. Alloy intergranular corrosion and exfoliation corrosion sensitivity in descending order: under-aging> peak aging> over-aging. This is mainly due to the large amount of precipitation of precipitated phase in the crystal, which increases the electrode potential of the matrix after aging treatment. The discontinuous distribution of grain boundary precipitates and the PFZ structure effectively block the corroded anode channel.