Improving the functionality and performance of AA2024 corrosion sensing coatings with nanocontainers
authors Galvao, TLP; Sousa, I; Wilhelm, M; Carneiro, J; Oprsal, J; Kukackova, H; Spacek, V; Maia, F; Gomes, JRB; Tedim, J; Ferreira, MGS
nationality International
journal CHEMICAL ENGINEERING JOURNAL
author keywords Aeronautical; Coatings; Sensing; Corrosion; Nanocapsules; Performance tests
keywords ALUMINUM; INHIBITION; PROTECTION; DFT; COMBINATION; COPPER; FILMS; PH
abstract The compatibility between nanocontainers and coating formulations is perhaps the last frontier in the quest for functional coatings. Sensing coatings for early metallic corrosion detection is an urgently needed technology by aeronautical companies to mitigate the costs of corrosion through continuous monitoring. In this work, we revisit phenolphthalein encapsulated silica nanocapsules, which were incorporated into a water-based lacquer, resulting in a novel corrosion sensing coating for aluminum alloy 2024 with improved functionality and standard performance. The ability of the coatings to detect corrosion by color change was investigated by immersion and salt-spray tests. During these tests, it was clearly demonstrated that encapsulation of the active compound is essential to obtain a functional coating, since the shell of the silica nanocapsules minimizes the detrimental interaction of the active compound with the coating formulation. The compatibility between nanostructured additives and coatings is almost never taken into consideration in the literature. Herein this aspect evidences the positive effects of active agent encapsulation, which is explored in terms of reactivity, viscoelastic properties, curing, thermal stability, release and leaching studies, hardness, mechanical properties and corrosion resistance. Computer simulations based on the density functional theory and periodic structural models were performed to unveil the interaction mode of phenolphthalein with the metallic surface.
publisher ELSEVIER SCIENCE SA
issn 1385-8947
year published 2018
volume 341
beginning page 526
ending page 538
digital object identifier (doi) 10.1016/j.cej.2018.02.061
web of science category Engineering, Environmental; Engineering, Chemical
subject category Engineering
unique article identifier WOS:000445561100052

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