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Synthèse de particules et incorporation dans un revêtement en vue d'améliorer ses propriétés lubrifiantes

Abstract : In the field of transport, zinc coating (to combat corrosion), passivation coating (to increasecorrosion protection and be more aesthetic) and topcoat (for lubrication) are three treatments appliedto small mechanical parts such as screws. The main aim of this study is to provide lubricatingproperties to the passivated layer to reduce the number of steps in the coating process and substantiallyreduce costs. The method includes: silica functionalized with a fluorinated silane and a lubricantencapsulated in silica.Spherical and monodispersed silica particles (between 40 to 100nm) were functionalized witha fluorinated silane using a one-step synthesis from the initial microemulsion. This resulted in theparticles enhancing the lubricating properties of the topcoat but not those of the passivation coating.Microcapsules containing a lubricant (PAO, polyalphaolefin or n-octadecane with a phasechange at 27°C) with an average size of a few micrometers were synthetized in a simple emulsionunder acidic conditions. The maximum encapsulation rate of the lubricant was 70%. These capsulesdid not provide lubricating properties to the passivated coating on the screws. This is because the rateof incorporation of the capsules in this layer is too weak.
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Haydar Ornek. Synthèse de particules et incorporation dans un revêtement en vue d'améliorer ses propriétés lubrifiantes. Matériaux. Université de Franche-Comté, 2014. Français. ⟨NNT : 2014BESA2006⟩. ⟨tel-01325288⟩

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