Corrosion resistance and long-term antibacterial performance of ZnO-Al2O3 nanocomposite coatings on aluminum alloy

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2024-09-30 DOI:10.1016/j.coco.2024.102110

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Abstract

Anodic aluminum oxide-zinc (AAO-Zn) coatings were prepared on aluminum (Al) alloy substrates through anodization and nZnO deposition. Further heat treatment at various temperature is applied to the composite coatings. Among the samples, AZ-250 sample showed lower corrosion current density (1.127 × 10⁻⁸ A/cm²) and higher charge-transfer resistance (4.65 × 10⁵ Ω cm²) compared to the AZ-150 and AZ-350 samples. At 250 °C, a greater incorporation of nZnO into the AAO layer facilitated the fusion of ZnO with aluminum oxide, resulting in a denser and more protective coating. The antibacterial research revealed AZ-250 sample achieved a 100 % reduction of S. aureus and 97.9 % of E. coli within 2 h. Even after 40 days of air exposure, the AZ-250 sample maintained high antibacterial effectiveness due to ZnO attachment and sustained Zn²⁺ release from the nanoporous AAO structure. This nanocomposite is suitable for applications in heat exchangers, medical instrument casings, and transport structure.

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铝合金上的 ZnO-Al2O3 纳米复合涂层的耐腐蚀性和长期抗菌性能

通过阳极氧化和氧化锌沉积，在铝（Al）合金基底上制备了阳极氧化铝锌（AAO-Zn）涂层。然后在不同温度下对复合涂层进行热处理。与 AZ-150 和 AZ-350 样品相比，AZ-250 样品的腐蚀电流密度（1.127 × 10-8 A/cm2）更低，电荷转移电阻（4.65 × 105 Ω cm2）更高。在 250 ℃ 时，AAO 层中的氧化锌含量增加，促进了氧化锌与氧化铝的融合，从而形成了更致密、保护性更强的涂层。抗菌研究表明，在 2 小时内，AZ-250 样品可减少 100% 的金黄色葡萄球菌和 97.9% 的大肠杆菌。即使在空气中暴露 40 天后，由于 ZnO 的附着和纳米多孔 AAO 结构中 Zn2⁺ 的持续释放，AZ-250 样品仍能保持很高的抗菌效果。这种纳米复合材料适用于热交换器、医疗仪器外壳和运输结构。

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.