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The effect of microstructures on intergranular corrosion resistance of 6061 aluminum alloy extrusions

机译：微观结构对6061铝合金挤压晶间耐腐蚀性的影响

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Intergranular corrosion (IGC) behavior of 6061aluminum alloy extrusions was investigated. After IGC test inaccordance with ISO/DIS 11846 (method B), heavy IGC wasobserved and the corrosion reached about 300 pm deep from thesurface. However, it became clear that the IGC did not propagatemore than 300 i deep from the surface during IGC test for along period. It was considered that the IGC was caused by theexistence of PFZs because PFZs were clearly observed on thesurface layer of the extrusion but were not observed in the centerposition of the extrusion thickness. Furthermore, it was consideredthat the formation of PFZs was associated with the grainboundaries characteristics. That is, it was suggested that most ofthe grain boundaries had random high angle in the extrusionsurface, but had small angle in the center plane of the thickness. Toverify this hypothesis, the center plane which was cold rolled andrecrystallized was examined by the IGC test. As a result, heavy IGCwas observed because the center plane had random high angle boundaries and PFZs.
机译：研究了6061铝合金挤出的晶间腐蚀（IGC）行为。通过ISO / DIS 11846（方法B）确认IGC测试，重型IGC挥发性，腐蚀从Thesfrace深度达到约300μm。然而，很明显，IGC在IGC测试期间，IGC在表面沿着时期从表面深度繁殖。被认为IGC是由PFZ的重要性引起的，因为在挤出的胶质层上清楚地观察到PFZ，但在挤出厚度的中心位置未观察到。此外，它被认为是PFZ的形成与粒度特征有关。也就是说，有人建议大多数晶界在挤出表面中具有随机的高角度，但在厚度的中心平面中具有小的角度。富集该假设，通过IGC测试检查了冷轧和漂冲的中心平面。结果，由于中心平面具有随机的高角度边界和PFZ，因此观察到的重型IGW。

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