Three different approaches were applied to obtain textured superhydrophobic surfaces on Al6082 aluminium alloys (boiling water, HF/ HCl and HNO3/HCl concentrated solution etching). Afterwards, a octadecylsilane thin film was deposited on all as-treated surfaces to reduce theirs surface energy. The morphological analysis showed that a specific dual nano/micro-roughness structure was obtained for each pre-treated surface. All samples evidenced a superhydrophobic behaviour, with water contact angle (WCA) in the range 160°-180°. The adhesion force between the water droplets and superhydrophobic surfaces were evaluated. The results evidenced that HF/ HCl etched samples showed the lowest adhesion and highest WCA. Furthermore, the relationship among hydrophobic behaviour, corrosion resistance and surface morphology was discussed comprehensively.
Superhydrophobic behaviour of modified AA6082 alloy surfaces
Calabrese L.Writing – Original Draft Preparation
;Proverbio E.Supervision
;Khaskhoussi A.Formal Analysis
2019-01-01
Abstract
Three different approaches were applied to obtain textured superhydrophobic surfaces on Al6082 aluminium alloys (boiling water, HF/ HCl and HNO3/HCl concentrated solution etching). Afterwards, a octadecylsilane thin film was deposited on all as-treated surfaces to reduce theirs surface energy. The morphological analysis showed that a specific dual nano/micro-roughness structure was obtained for each pre-treated surface. All samples evidenced a superhydrophobic behaviour, with water contact angle (WCA) in the range 160°-180°. The adhesion force between the water droplets and superhydrophobic surfaces were evaluated. The results evidenced that HF/ HCl etched samples showed the lowest adhesion and highest WCA. Furthermore, the relationship among hydrophobic behaviour, corrosion resistance and surface morphology was discussed comprehensively.Pubblicazioni consigliate
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