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Article Dans Une Revue Scientific Reports Année : 2023

Corrosion-driven droplet wetting on iron nanolayers

Résumé

The classical Evans’ drop describes a drop of aqueous salt solution, placed on a bulk metal surface where it displays a corrosion pit that grows over time producing further oxide deposits from the metal dissolution. We focus here on the corrosion-induced droplet spreading using iron nanolayers whose semi-transparency allowed us to monitor both iron corrosion propagation and electrolyte droplet behavior by simple optical means. We thus observed that pits grow under the droplet and merge into a corrosion front. This front reached the triple contact line and drove a non radial spreading, until it propagated outside the immobile droplet. Such chemically-active wetting is only observed in the presence of a conductive substrate that provides strong adhesion of the iron nanofilm to the substrate. By revisiting the classic Evan’s drop experiment on thick iron film, a weaker corrosion-driven droplet spreading is also identified. These results require further investigations, but they clearly open up new perspectives on substrate wetting by corrosion-like electrochemical reactions at the nanometer scale.
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hal-04258987 , version 1 (25-10-2023)

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Aurelien Ricard, Frederic Restagno, Yun Hee Jang, Yves Lansac, Eric Raspaud. Corrosion-driven droplet wetting on iron nanolayers. Scientific Reports, 2023, 13 (1), pp.18288. ⟨10.1038/s41598-023-45547-9⟩. ⟨hal-04258987⟩
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