2012•Hangkong cailiao xuebaoOpen access
Effect of Enhanced-Solid-Solution on Intergranular Corrosion and Exfoliation Corrosion Properties of 7085 Type Aluminum Alloy Containing Strontium
Wu Yao
Open full text 3 citations
Abstract
The effect of enhanced-solid-solution treatment on the hardness,electrical conductivity,intergranular corrosion and exfoliation corrosion properties of strontium(Sr) microalloyed 7085 type aluminum alloy(Al-7.95Zn-1.80Mg-1.59Cu-0.15Zr-0.024Sr) was investigated by using microhardness testing,electrical conductivity testing,intergranular/exfoliation corrosion experiments,and optical and scanning electron microscopy observation.The results show that compared with the conventional solid-solution treatment(470(C/2 h),the enhanced-solid-solution treatment(470 ℃/2 h+480 ℃/2h+490 ℃/2 h) advances the dissolution of coarse second phases.After being treated by the conventional T6(121 ℃/2 h) ageing,relative to the conventional solid-solution treated alloy,the enhanced-solid-solution alloy exhibites a slightly lower hardness,slightly higher electrical conductivity,and a considerable improvement in intergranular corrosion and exfoliation corrosion resistances.The present experimental results demonstrate that the enhanced-solid-solution treatment is an effective tool to improve the anti-corrosion,especially the anti-exfoliation corrosion properties of Sr microalloyed 7085 type aluminum alloy.