Argiles en tant que réservoirs d'inhibiteurs de corrosion métallique issus de ressources naturelles dans des peintures pour la protection des métaux

Abstract : This work was devoted to the development of new micrometric tanks of corrosion inhibitors based on mineral natural resources (Moroccan beidellite and palygorskite clays), and organic (chitosan and heptanoic acid) to be used as corrosion inhibitor tanks in the paintings. In the reservoirs of beidellite type, the storage of corrosion inhibitors made either by saturating the interlamellar areas by corrosion inhibitors cations such as Ca2+, or Ce3+, or by modifying the electrostatic charge of clays by intercalation of chitosan biopolymer in order to adsorb anionic compounds as heptanoate ions (C7-. In palygorskite type tanks, storage is based on the grafting of an alkoxysilane on the surface silanol sites to adsorb compounds via NH3+ sites. After characterizing materials before and after functionalization by several analytical techniques, the performance of corrosion inhibitors on zinc and mild steel in NaCl medium was evaluated and compared to those of commercial compound aluminium dihydrogen triphosphate (TPA) using stationary and dynamic electrochemical techniques. Overall, the organic coating containing modified C7- beidellite shows better protection of zinc than TPA compound. Similarly, C7- grafted palygorskite coating presents a very interesting performance of corrosion inhibition of mild steel corrosion compared to the coating with TPA, during approximately 400 h of immersion
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Ahmed Ait Aghzzaf. Argiles en tant que réservoirs d'inhibiteurs de corrosion métallique issus de ressources naturelles dans des peintures pour la protection des métaux. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0049⟩. ⟨tel-01750755⟩

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