A new strategy to improve the anticorrosion performance of waterborne polyurethane coating on AA7075

Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control Pub Date : 2024-04-24 DOI:10.1177/1478422x241247943

Bing Lei, Jingjing Li, Ling Liu, Longjiang Lian, Simin Chen, Shanlin Zhang, Zhi-ming Feng, Guozhe Meng

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Abstract

In this study, Ce3+ functionalised halloysite nanotubes (HNTs) were prepared, and their impact on the anticorrosion properties of waterborne polyurethane (WPU) coating on 7075 aluminium alloy (AA7075) was investigated. HNTs were grafted by 3-aminopropyltriethoxysilane (APTES) to enhance Ce3+ loading, which was confirmed by X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectrum. The release behaviour of Ce3+ from HNTs was tested by inductively coupled plasma optical emission spectrometry (ICP-OES), and the inhibition effect of Ce3+-loaded HNTs for AA7075 was tested by polarization plots. The anticorrosion property of WPU doped with Ce3+-loaded HNTs was investigated by electrochemical impedance spectroscopy (EIS) and pull-off adhesion test. The results showed that APTES modification improved the Ce3+ loading amount on HNTs, and Ce3+ acts as an effective cathodic inhibitor for AA7075. After soaking for 40 days, the |Z|0.01Hz of Ce-HNTs/WPU was two orders of magnitude higher than that of pure WPU, while wet put-off adhesion was higher than pure WPU.

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提高 AA7075 水性聚氨酯涂层防腐性能的新策略

本研究制备了 Ce3+ 功能化的埃洛石纳米管 (HNT)，并研究了它们对 7075 铝合金 (AA7075) 上水性聚氨酯 (WPU) 涂层防腐性能的影响。通过 3-aminopropyltriethoxysilane (APTES) 接枝 HNTs 来提高 Ce3+ 的负载量，X 射线衍射 (XRD) 和傅立叶变换红外 (FT-IR) 光谱证实了这一点。通过电感耦合等离子体光发射光谱（ICP-OES）测试了 HNTs 中 Ce3+ 的释放行为，并通过极化图测试了 Ce3+ 负载 HNTs 对 AA7075 的抑制作用。通过电化学阻抗谱（EIS）和拉脱附着试验研究了掺杂了 Ce3+ 负载 HNTs 的 WPU 的防腐性能。结果表明，APTES 改性提高了 HNTs 上的 Ce3+ 负载量，Ce3+ 成为 AA7075 的有效阴极抑制剂。浸泡 40 天后，Ce-HNTs/WPU 的|Z|0.01Hz 比纯 WPU 高两个数量级，而湿放附着力则比纯 WPU 高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control

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