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首页> 外文期刊>International journal of structural integrity >Corrosion damage evolution of the aircraft aluminum alloy 2024 T3
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Corrosion damage evolution of the aircraft aluminum alloy 2024 T3

机译:飞机铝合金2024 T3的腐蚀损伤演变

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摘要

Purpose - The purpose of this paper is to quantify the corrosion damage evolution that has occurred on the aircraft aluminum alloy 2024 after the exposure to Exfoliation Corrosion Test (EXCO) solution. Moreover, the effect of the evolving corrosion damage on the materials mechanical properties has been assessed. The relevance of the corrosion damage induced by the exposure to the laboratory EXCO for linking it to the damage developed after the exposure of the material on several outdoor corrosive environments or in service is discussed. Design/methodology/approach - To induce corrosion damage the EXCO has been used. For the quantification of corrosion damage the metallographic features considered have been pit depth, diameter, pitting density and pit shape. The effect of the evolving corrosion damage on the materials mechanical properties has been assessed by means of tensile tests on pre corroded specimens. Findings - The results have shown that corrosion damage starts from pitting and evolves to exfoliation, after the development of intergranular corrosion. This evolution is expressed by the increase of the depth of attack, as well as through the significant growth of the diameter of the damaged areas. The results of the tensile tests performed on pre corroded material made an appreciable decrease of the materials tensile properties evident. The decrease of the tensile ductility may become dramatic and increases on severity with increasing corrosion exposure time. SEM fractography revealed a quasi-cleavage zone beneath the depth of corrosion attack. Originality/value - The results underline the impact of corrosion damage on the mechanical behavior of the aluminum alloy 2024 T3 and demonstrate the need for further investigation of the corrosion effect on the structural integrity of the material. This work provides an experimental database concerning the quantification of corrosion damage evolution and the loss of material properties due to corrosion.
机译:目的-本文的目的是量化暴露于剥落腐蚀试验(EXCO)溶液后,飞机铝合金2024所发生的腐蚀破坏演变。此外,已经评估了不断发展的腐蚀破坏对材料机械性能的影响。讨论了由于暴露于实验室EXCO所引起的腐蚀破坏的相关性,以将其与在几种室外腐蚀性环境中或在使用中暴露于该材料后所产生的破坏联系起来。设计/方法/方法-为了引起腐蚀损坏,已使用EXCO。为了量化腐蚀损伤,所考虑的金相特征是凹坑深度,直径,凹坑密度和凹坑形状。腐蚀腐蚀对材料机械性能的影响已通过对预腐蚀试样的拉伸试验进行了评估。研究结果-结果表明,在晶间腐蚀发生后,腐蚀破坏从点蚀开始并发展为剥落。这种演变表现为攻击深度的增加以及受损区域直径的显着增长。对预腐蚀材料进行的拉伸试验结果使材料的拉伸性能明显下降。拉伸延展性的下降可能变得显着,并且随着腐蚀暴露时间的增加,其严重性会增加。 SEM断层扫描显示腐蚀侵蚀深度以下的准裂解带。原创性/价值-结果强调了腐蚀破坏对2024 T3铝合金力学性能的影响,并表明需要进一步研究腐蚀对材料结构完整性的影响。这项工作提供了一个实验数据库,该数据库涉及腐蚀损伤演变的量化以及由于腐蚀导致的材料性能损失。

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