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Development of a smart coating based on hollow nanoparticles for corrosion detection and protection

Abstract : In various domains, but especially in the space industry, protection of metallic structures against corrosion is a foremost objective because of maintenance and fixing costs in harsh environments. In order to preserve their integrity, a promising and original solution consists in detecting and slowing down corrosion as soon as it appears by developing a corrosion-sensitive and reactive coating. Recently, numerous studies have searched for the development of functional surfaces able to locally react to corrosion-related stimuli, belonging to the category of smart coatings. This PhD project, granted by ArianeGroup, is focused on this objective and deals with the development of nanocapsules containing corrosion inhibitors. These nanocapsules, formed through a miniemulsion process, are incorporated within an organic coating, applied on top of either steel of aluminum alloy substrates. The formed nanocapsules are then able to release their payload using a pH increase as a trigger. A pH change is indeed expected during cathodic activity, appearing at the early stages of the substrate degradation. This work describes the synthesis and characterization of nanocapsules, as well as their incorporation within an organic waterborne matrix. Both hydrophilic and hydrophobic-core capsules have been investigated before focusing on oil-core silica nanocapsules with diameter ca. 180 nm. In the first part, the release of a model inhibitor, namely 2-mercaptobenzothiazole (MBT) has been investigated and the inhibiting properties demonstrated. Then, the impact of capsules addition on coating integrity and properties has been studied using mainly electrochemical impedance spectroscopy. Potential enhancements of the proposed system are discussed. This system could be adapted and used for early detection of corrosion, using a corrosion sensor instead of the encapsulated inhibitor.
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https://tel.archives-ouvertes.fr/tel-02475624
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Submitted on : Wednesday, February 12, 2020 - 10:55:41 AM
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  • HAL Id : tel-02475624, version 1

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Pierre Loison. Development of a smart coating based on hollow nanoparticles for corrosion detection and protection. Materials. Université de La Rochelle, 2019. English. ⟨NNT : 2019LAROS009⟩. ⟨tel-02475624⟩

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