Abstract
Fiber metal laminates (FMLs), a kind of lightweight material with excellent comprehensive performance, have been successfully applied in aerospace. FMLs reinforced with carbon fiber have better mechanical properties than those with glass or aramid fiber. However, carbon fiber binding metal may lead to galvanic corrosion which limits its application. In this paper, electrochemical methods, optical microscope and scanning electron microscope were used to analyze the corrosion evolution of carbon fiber reinforced aluminum laminate (CARALL) in corrosive environment and explore anti-corrosion ways to protect CARALL. The results show that the connection between carbon fiber and aluminum alloy changes electric potential, causing galvanic corrosion. The galvanic corrosion will obviously accelerate CARALL corroded in solution, leading to a 72.1% decrease in interlaminar shear strength, and the crevice corrosion has a greater impact on CARALL resulting in delamination. The reduction of interlaminar shear strength has a similar linear relationship with the corrosion time. In addition, the adhesive layers between carbon fiber and aluminum alloy cannot protect CARALL, while side edge protection can effectively slow down corrosion rate. Therefore, the exposed edges should be coated with anti-corrosion painting. CARALL has the potential to be used for aerospace components.
摘要
纤维金属层板是一种综合性能优异的轻量化材料, 已经成功地应用于航空航天领域。其中, 使 用碳纤维增强的纤维金属层板比采用玻璃纤维或芳纶纤维的层板具有更好的力学性能。然而, 碳纤维 与金属的结合容易引起电偶腐蚀, 极大地限制了其应用。本文采用电化学方法、光学显微镜和扫描电 子显微镜等分析了碳纤维增强铝合金层板在腐蚀环境中的腐蚀演变, 探讨了防止碳纤维增强铝合金层 板发生腐蚀的保护方法。结果表明, 碳纤维与铝合金的连接改变了电位从而引起电偶腐蚀, 电偶腐蚀 会明显导致碳纤维增强铝合金层板的腐蚀速度变快, 导致层间剪切强度下降达到72.1%; 同时, 缝隙 腐蚀也对层板的影响很大从而引起分层破坏。层间剪切强度的下降与腐蚀时间呈现出类似线性的关 系。此外, 碳纤维与铝合金之间的粘接层并不能起到保护作用, 而侧边保护却可以有效地减缓层板腐 蚀速度。因此, 碳纤维增强铝合金层板应该在裸露的边部涂上防腐涂料。该材料有潜力用于航空航天 部件。
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Project(51675538) supported by the National Natural Science Foundation of China
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The overarching research goals were developed by WU Xin-tong, ZHAN Li-hua and HUANG Ming-hui. WU Xin-tong and ZHAO Guo-qing measured and analyzed the data. The initial draft of the manuscript was written by WU Xin-tong and WANG Xun. ZHAO Xing edited the draft of manuscript. All authors replied to reviewers’ comments and revised the final version.
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WU Xin-tong, ZHAN Li-hua, HUANG Ming-hui, ZHAO Xing, WANG Xun and ZHAO Guo-qing declare that they have no conflict of interest.
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Wu, Xt., Zhan, Lh., Huang, Mh. et al. Corrosion damage evolution and mechanical properties of carbon fiber reinforced aluminum laminate. J. Cent. South Univ. 28, 657–668 (2021). https://doi.org/10.1007/s11771-021-4635-8
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DOI: https://doi.org/10.1007/s11771-021-4635-8
Key words
- carbon fiber reinforced aluminum laminate
- galvanic corrosion
- electrochemistry
- interlaminar shear strength
- aluminum alloy