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冷变形及退火对5E06铝板晶间腐蚀性能的影响
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-08-25
采用晶间腐蚀性能测试及透射电镜研究冷变形及退火对5E06铝板晶间腐蚀性能的影响规律。
冷变形及退火对5E06铝板晶间腐蚀性能的影响Effect of cold deformation and annealing on intergranular
corrosion property of 5E06 aluminium alloy plates
采用晶间腐蚀性能测试及透射电镜研究冷变形及退火对5E06铝板晶间腐蚀性能的影响规律。结果发现：5E06铝板的晶间腐蚀性能与β相的分布、形貌和析出量密切相关。当冷变形量低于40%时，β相较易在晶界析出达到连续而使合金晶间腐蚀性能恶化；当变形量增加到55%以上时，经稳定化退火后β相在晶界不容易连续，5E06铝板晶间腐蚀性能良好。进一步的敏化试验表明，经55%~80%冷变形的5E06铝板在120
℃稳定化退火的效果并不理想，而220℃的稳定化退火由于获得了比较均匀的亚晶组织且β相在晶界/亚晶界断续分布并一定程度上降低基体中镁原子的过饱和度，可使稳定化退火态5E06铝板在长期使用过程中晶间腐蚀性能不发生明显退化。
The effects of cold deformation and annealing on the
intergranular corrosion property of 5E06 aluminium alloy plates were
investigated by intergranular corrosion property tests and transmission electron
microscope (TEM). The results show that the intergranular corrosion property of
5E06 aluminium alloy plates has close relationship with the distribution,
morphology and quantity of β phase. When the cold deformation is under 40%, β
phase is easy to precipitate continuously at grain boundaries which will worsen
the intergranular corrosion property. When the cold deformation exceeds 55%, β
phase is not easy to achieve succession after stabilizing annealing and the 5E06
aluminum alloy plates have favorable intergranular corrosion property.
Sensitization tests indicate that the effect of stabilizing at 120 ℃ is not
desirable for 5E06 aluminum alloy plates at cold deformation of 55%-80%, whereas
the aluminum alloy plates annealed at 220 ℃ can obtain homogeneous subgrains and
β phase distributes discretely at grain boundaries and subgrain boundaries which
can reduce the degree of supersaturation to some extent. Therefore, the
intergranular corrosion property of 5E06 aluminum alloy plates at stabilizing
annealing states won’t degenerate obviously in the long-term using
process.
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