本文研究了8090Al—Li合金的点蚀、晶间腐蚀和剥落腐蚀性能,探讨了热处理制度对耐腐蚀性能的影响。结果表明:Al-2.79Li-1.3Cu-0.7Mg-0.12Zr合金自然时效态抗晶间腐蚀和剥落腐蚀性能最佳,峰时效状态耐腐蚀性能最差,欠时效比过时效略好。显微组织观察表明合金的耐蚀性能与显微组织密切相关,峰时效条件下,粗大T_2相连续分布于晶界上,它的电位比基体电位低因此晶界构成阳极通道,从而使合金耐蚀性能恶化。
The Al-2.79Li-1.3Cu-0.7Mg-0.12Zr(8090 Al-Li) alloy has excellent re-sistance to intergranular and exfoliation corrosion as naturally aged, worst as peakaged and rather better as underaged than as overaged. The corrosion behaviour ofthe alloy is closely dependent on its microstructure. Under the peak aging condition,the coarse T_2 phase, which is continuously distributed along grain boundary, has solow corrosion potential in comparison with matrix, that makes the corrosion resis-tance of the alloy to be deteriorated by anodic dissolution along grain boundary.
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