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Étude d'inhibiteurs de corrosion métallique à base d'orthophosphates de zirconium lamellaires fonctionnalisés : synthèse, caractérisations et applications

Abstract : This thesis generally aims at the development of corrosion inhibitors based on a lamellar compound, namely zirconium orthophosphate (α-ZrP). The principle consists in that α-ZrP acts as micro-tanks in such a way to store species of several compounds known for their metallic corrosion inhibition properties. On the other hand, inhibitive species based on Ca2+, Mg2+, and Zn2+ were be able to be successfully incorporated within α-ZrP interlayer spaces via cationic exchange with labile H+ protons. Similarly, entities of the heptanoate anion were inserted via the prior intercalation of the cationic biopolymer chitosan. Nevertheless, the intercalation of organic species such as 2-aminobenzimidazole, dodecylamine was accomplished via acid-basic reaction between –NH2 groups and H+ protons. The characterizations of the materials before and after functionalization by different analytical techniques denote that all these modifications give rise to inorgano-inorganic or organo-inorganic hybrid materials. The evaluation of their performances, in term of metallic corrosion inhibition, was performed by using stationary or dynamic electrochemical techniques. It has been shown that the use of these pigments in corrosive medium, either alone or dispersed in paints, improves corrosion inhibition of zinc and mild steel thanks to the progressive release of intercalated species compensated by the retention of corrosive entities better than those induced by commercial products. This in final allows lengthening the inhibition action of metallic substrates against aqueous corrosion
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Imane Bouali. Étude d'inhibiteurs de corrosion métallique à base d'orthophosphates de zirconium lamellaires fonctionnalisés : synthèse, caractérisations et applications. Matériaux. Université de Lorraine; Université Caddi Ayyad, Marrakech (Maroc), 2018. Français. ⟨NNT : 2018LORR0118⟩. ⟨tel-01887184⟩

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