Abstract
The ways of producing porous-like textured surfaces with chemical etching on aluminum-alloy substrates were studied. The most appropriate etchants, their combination, temperature, and etching time period were explored. The influence of a specifically textured surface on adhesive joints’ strength or superhydrophobic properties was evaluated. The samples were examined with scanning electron microscopy, profilometry, atomic force microscopy, goniometry, and tensile testing. It was found that, with the multistep etching process, the substrate can be effectively modified and textured to the same morphology, regardless of the initial surface roughness. By selecting proper etchants and their sequence one can prepare new types of highly adhesive or even superhydrophobic surfaces.
Highlights
Aluminum alloys have long been used in many industrial applications, especially for their anticorrosion properties and low specific weight [1]
The and firstDiscussion section of the results deals with the effect of etchant composition, temperature, and etching on the duralumin surface topography
It was found that the appropriate combination either porous-like structured or smooth surfaces
Summary
Aluminum alloys have long been used in many industrial applications, especially for their anticorrosion properties and low specific weight [1]. For front and functional surfaces, which come into contact with other materials and weather conditions, aluminum alloys are essential postproduction processes for surface treatment [2,3,4]. These modifications should improve the appearance of the final product and inhibit surface oxidation [5,6,7], promote adhesion [8,9,10,11], or reduce staining thanks to their self-cleaning properties [4,12]. The following chemicals are among those used: a hot sodium hydroxide solution with subsequent nitric acid application [3], phosphoric acid [13], acids with the addition of surfactants [19], salts [20], ferrous ions [14], mixtures of phosphoric and nitric acid with copper or ammonia ions [15], a mixture of hydrochloric acid with sulfuric acid or ethylene glycol [16], and hydrochloric acid alone [12,21]
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