摘要
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。
Effects of aging conditions on mechanical and corrosion properties of a new type high strength aluminum alloy profile was studied by tensile, intergranular corrosion, exfoliation corrosion test and transmission electron microscopy .The results show that the alloy has the maximum value of strength after peak-aged.The over-aged alloy has the best corrosion resistance , and the under-aged alloy has the best elongation.The sensitivities order of the intergranular corrosion and the exfoliation corrosion from high to low is under -aged,peak -aged and over-aged.This is because that after over-aging, the electrode potential of matrix is increased with a lot of precipitations precipitates from intragranular , meanwhile there are sparsely distributed precipitates and narrow precipitate free zone ( PFZ ) along grain boundaries , which decrease the anode channel of intergranular corrosion .
出处
《金属热处理》
CAS
CSCD
北大核心
2014年第9期1-5,共5页
Heat Treatment of Metals
关键词
时效状态
高强铝合金型材
力学性能
腐蚀性能
aging condition
high strength aluminum alloy profile
mechanical properties
corrosion properties
