Abstract
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 154º for 30 min of acid etching. This condition also showed higher corrosion resistance, obtaining higher values of Ecorr and lower values of corrosion current density.
Highlights
Biomimetic deals with the study of models, systems or processes that imitate nature, which has been adapted to solve the current problems of humanity[1,2]
This paper aimed to develop and to characterize anticorrosive superhydrophobic coatings on 5052 aluminum alloy obtained from chemical modified using acid etching in different times (10, 20 and 30 min), treatment with zinc nitrate for lamellar double hydroxides (LDH) films formation and acid stearic as reducing surface agent
Superhydrophobic surfaces on 5052 aluminum samples with excellent corrosion resistance were successfully prepared by a simple and low-cost method of chemical modification using an acid etching combined with LDH films and stearic acid
Summary
Biomimetic deals with the study of models, systems or processes that imitate nature, which has been adapted to solve the current problems of humanity[1,2]. The Lotus plant is considered a symbol of the sacred and one of the reasons is its ability to repel microorganisms and dust. This is due to an effect called the Lotus Effect, most commonly called superhydrophobicity, which occurs due to the existence of a surface roughness consisting of a microscopic structure and nanostructured substructure[2,3]. This effect has attracted the interest of several sectors, resulting in the obtaining of several patents, because in addition to their self-cleaning property, these superhydrophobic (SHP) surfaces have antifouling, anti-freezing and anticorrosive properties. Deterioration due to the corrosive process of metallic surfaces can be stopped or even completely prevented[4,5]
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