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Superhydrophobic aluminum alloy surfaces prepared by chemical etching process and their corrosion resistance properties

Huang Ying, Sarkar Dilip K. et Chen X-Grant. (2015). Superhydrophobic aluminum alloy surfaces prepared by chemical etching process and their corrosion resistance properties. Applied Surface Science, 356, p. 1012-1024.

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URL officielle: http://dx.doi.org/doi:10.1016/j.apsusc.2015.08.166

Résumé

Superhydrophobic aluminum alloy surfaces are obtained by chemical etching using 1 M NaOH solution followed by passivation using 0.01 M ethanolic stearic acid (SA) solution. The formation of low surface energy aluminum stearate takes place during the passivation process between stearic acid and hydroxyl group terminated aluminum alloy surfaces. A schematic model of the SA passivation process on the –OH terminated Al-surfaces is presented in this work. The flake-like micro-nanostructure morphology of the low surface energy aluminum stearate increases the water contact angle by more than 150°, demonstrating the superhydrophobic properties. The corrosion current density reduces and polarization resistance increase systematically with increasing passivation time. The polarization resistance, calculated from the Tafel curve of the superhydrophobic surfaces prepared by stearic acid passivation for 60 min, is determined to be 137 times larger than that of the as-received aluminum alloy substrate. Similarly, the modulus of impedance, as determined from electrochemical impedance spectroscopy (EIS), is found be 70 times larger for the superhydrophobic surfaces compared to the as-received aluminum alloy surface. These results demonstrate that the superhydrophobic aluminum alloy surfaces created by chemical etching followed by passivation have superior corrosion resistance properties than the as-receive aluminum alloy substrate.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:356
Pages:p. 1012-1024
Version évaluée par les pairs:Oui
Date:30 Novembre 2015
Sujets:Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:corrosion resistance, superhydrophobic aluminum alloy surfaces, chemical etching, aluminum stearate, potentiodynamic polarization, Electrochemical Impedance Spectroscopy (EIS), résistance à la corrosion, alliage de surface en aluminium superhydrophobe, gravure chimique, stéarate d'aluminium, polarisation potentiodynamique, spectroscopie d'impédance électrochimique (EIS)
Déposé le:04 nov. 2015 23:20
Dernière modification:09 déc. 2016 13:39
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