材料科学
铈
硝酸铈
润湿
接触角
能量色散X射线光谱学
扫描电子显微镜
冶金
铝
镁
复合材料
化学工程
工程类
作者
Guillermo Guerrero‐Vaca,Miguel A. Rodríguez‐Valverde,Pedro Castilla-Montilla,Francisco Alguacil-Salamanca,Óscar Rodríguez‐Alabanda,Pablo E. Romero,Esther Molero-Romero,Francisco Ruiz‐Cabello
出处
期刊:Coatings
[MDPI AG]
日期:2019-11-20
卷期号:9 (12): 774-774
被引量:2
标识
DOI:10.3390/coatings9120774
摘要
Aluminum-magnesium (Al-Mg) alloy and aluminum-coated steel (aluminized steel) are typically used for the manufacturing of baking trays and molds. For these applications, these materials must be modified to develop release and hydrophobic properties. With this aim, the bare substrates are typically coated with low-surface energy materials such as fluoropolymers, elastomers, or sol-gel layers. In this work, some alternative strategies to prepare these functional surfaces are presented. We used three-step processes involving (i) micro-texturing, (ii) nano layer deposition through immersion and electrodeposition, and (iii) hydrophobization. The raw substrates were sanded or sandblasted at the micro scale, accordingly. Texturization at the nano scale was achieved with a cerium layer formed by electrodeposition or solution immersion. The cerium layers were hydrophobized with fatty acids. The wetting properties of the samples were studied with tilting-plate and bouncing drop methods. We measured the surface roughness of the samples by contact profiling and analyzed their surface morphology using a field emission scanning electron microscope (FESEM). The elemental chemical composition of the samples was analyzed by energy-dispersive X-ray spectroscopy (EDX). The wettability results indicated that the best performance for the Al-Mg substrates was reached by sandblasting and later immersion in a cerium nitrate solution. For aluminized steel substrates, the best results were obtained with both electrodeposition and immersion methods using a cerium chloride solution.
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