Combining anodising and anaphoresis to enhance the chemical protection of Al alloys

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-09-27 DOI:10.1016/j.surfcoat.2025.132737

M.Belen García-Blanco , Maddalen Puyadena , Nicolás Ramos , Elixabete Espinosa , Alba Arias , Hans Jürgen Grande , Janet Hope , Peter Hope , Amaya Garcia-Casas

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Abstract

Aluminum alloys are promising alternatives to stainless steel in industrial applications due to their superior thermal conductivity and low weight. However, their use in the Food and Beverage industry requires effective surface treatments to withstand aggressive cleaning agents. This study evaluates the chemical resistance of polyurethane anaphoretic e-coatings on AA6082 alloy, examining the influence of curing temperature and the application of a prior anodic layer. Chemical resistance was assessed through immersion tests based on the Ecolab standard and electrochemical impedance spectroscopy. The results indicate that e-coatings cured at 180 °C exhibit superior barrier properties compared to those cured at standard conditions (120 °C) due to higher crosslinked network. Additionally, a thin anodic layer enhances the overall chemical protection by preventing e-coating swelling, as it limits reactions at the metal/coating interface.

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将阳极氧化与回渗相结合，提高铝合金的化学防护性能

铝合金由于其优越的导热性和重量轻，在工业应用中是不锈钢的有希望的替代品。然而，它们在食品和饮料行业的使用需要有效的表面处理，以承受咄咄逼人的清洁剂。研究了在AA6082合金上制备的聚氨酯电泳涂层的耐化学性，考察了固化温度和阳极层的应用对涂层耐化学性的影响。通过基于艺康标准和电化学阻抗谱的浸泡试验来评估耐化学性。结果表明，与在标准条件下（120°C）固化的电子涂层相比，在180°C下固化的电子涂层由于具有更高的交联网络而表现出更好的阻隔性能。此外，由于薄阳极层限制了金属/涂层界面的反应，因此可以防止电子涂层膨胀，从而增强整体化学防护。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.