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Theses

Nouveaux procédés d’imprégnation/colmatage de l’aluminium anodisé coloré - Réactivité chimique des nanopores d’oxyde d’aluminium

Abstract : Aluminum is widely used to make various coloured pieces intended for the bottling of pharmaceutical and cosmetic products, in particular for spraying or decorating systems for bottles in perfumery. After a glossing or satin-finishing step on the surface, the anodizing step forms a porous oxide layer of ten microns on the surface of the aluminum, followed by an impregnation phase, during which the organic or organometallic dye penetrates the nanometric pores of the oxide according to an absorption mechanism. The last step is to seal the pores with a solution of nickel salts, in order to preserve the colour, avoiding the desorption of the colouring molecules, without affecting the conditions of reflection / absorption of light. The aim of this work is to develop a new sealing process based on non-toxic compounds for the nanometric porous system of coloured anodized aluminum. Using electron microscopy analysis (TEM and SEM), electrochemical measurements (EIS) and elementary analysis of solutions (ICP-AES), the sealing mechanisms are mainly of two types: physical sealing by formation of a surface film of a hundred nanometers such as hydrothermal sealing and a mechanism for adsorption of sealing species in the pores such as sealing with silicates. This latter mechanism often results in desorption of the dye and loss of colour, measured by visible reflection spectrophotometry. Sealing with molecules of the carboxylate type works by an adsorption mechanism over a limited depth in the nanometric pores allowing preservation of the coloration. Electrochemical measurements and industrial tests have shown insufficient effectiveness in contact with aggressive electrolytes. In addition, the tribological properties of the sealed films, measured by nano-indentation, are insufficient. Phosphonate molecules have a stronger interaction with aluminum oxide which leads to very effective sealing. However, this induces a strong desorption of the dye and the tribological properties of the sealed films are not satisfactory. Among the short chain carboxylates, magnesium acetate constitutes an interesting compromise for a development aiming to modify the mechanical and tribological properties of sealed films.
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https://hal.univ-lorraine.fr/tel-03355039
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Submitted on : Monday, September 27, 2021 - 9:32:53 AM
Last modification on : Sunday, June 26, 2022 - 3:13:55 AM

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  • HAL Id : tel-03355039, version 1

Citation

Vincent Cartigny. Nouveaux procédés d’imprégnation/colmatage de l’aluminium anodisé coloré - Réactivité chimique des nanopores d’oxyde d’aluminium. Chimie. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0102⟩. ⟨tel-03355039⟩

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