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    Superhydrophobic Surfaces on 5052 Aluminum Alloy Obtained from LDH Film Modified with Stearic Acid for Enhanced Corrosion Protection

    Year: 2019

    Journal: Mater. Res.-Ibero-am. J. Mater., Volume 22

    Authors: Collasius Malta, Maria Isabel; Santos Vieira, Magda Rosangela; Casanova da Silva, Rafael Gleymir; Carneiro da Silva, Leonardo Mendonca; de Araujo, Edval Goncalves; De Oliveira Maciel, Sara Horacio; Urtiga Filho, Severino Leopoldino

    Organizations: FINEPFinanciadora de Inovacao e Pesquisa (Finep); CNPqConselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ); CAPESCoordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES); FACEPEFundacao de Amparo a Ciencia e Tecnologia do Estado de Pernambuco (FACEPE); ANP/Petrobras

    Keywords: Superhydrophobic Surface; Micro/nanostructured Surface; LDHfilm; Aluminum alloy 5052; Corrosion

    This paper aimed to develop and characterize superhydrophobic surfaces with anticorrosive properties obtained by the chemical modification of the 5052 aluminum alloy with variation of acid etching time, formation of lamellar double hydroxides (LDH) film and immersion in stearic acid. The specimens were etched in HCl (2M) at 5, 10 and 30 min. The aluminum plates were treated with aqueous solution of zinc nitrate (0.1 M) in the presence of ammonia and then immersed in a stearic acid and ethanol solution (1% w/w) to reduce surface energy. Contact angles (CA) were determined. Surface morphology and composition were analyzed by scanning electron microscopy (SEM) and X-ray energy dispersion spectroscopy (EDS), respectively. Linear polarization tests were performed to analyze corrosion resistance. The optimal superhydrophobic performance was obtained with a contact angle of 154 degrees for 30 min of acid etching. This condition also showed higher corrosion resistance, obtaining higher values of E-corr and lower values of corrosion current density.
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