Equipe 23 : Inhibiteurs de corrosion
Chef d'équipe :
Membres d'équipe :
Projets de l'équipe :
1- Study of the Protective Performances of Eco-Friendly Corrosion Inhibitors of Metallic Materials within Aggressive Aqueous Media 2016-2018
The widespread use of acidic solutions in many industries leads to undesirable outcomes. Indeed, these solutions constitute an aggressive medium towards the metals and alloys as they damage the performance of these materials due to the corrosion phenomenon. Therefore, incorporation of efficient methods for the protection of metallic structures is of great importance; hence, the main objective is to protect the material, to keep it functional and to enhance its durability. In terms of protection, chemical inhibitors are a practical and an economical way to overcome this adverse process. An inhibitor is a chemical compound that is added in a small quantity to the medium in order to reduce the corrosion rate of the material. Therefore, the present project consists in studying the corrosion protection of metallic materials (steels, iron, aluminum alloys, etc.) in an aggressive aqueous medium, pickling acids and aqueous ions, by means of eco-friendly inhibitors. Firstly, we focus on characterization of the studied materials by the identification of the crystalline phases and microstructures by XRD, SEM, XRF, etc. Then, the corrosion study of these samples in aggressive aqueous media using the electrochemical techniques, Tafel and EIS, is carried out. During this step, correlation between the microstructure of the metal and its electrochemical behavior (corrosion) is investigated. The influence of certain parameters such as temperature and concentration of the corrosive medium on the rate of corrosion is also evaluated. Secondly, we begin the formulation of the corrosion inhibitors. These substances may be organic molecules of different chemical functions as nitrogen, sulfur or oxygen atoms, plant extracts, proteins or expired pharmaceuticals. Other inorganic molecules such as metal ions are also applied. Another class of inhibitors corresponding to the mesoporous molecules, zeolite, is incorporated and studied as a corrosion inhibitor. Finally, in order to elucidate the mechanism of the corrosion inhibition, inhibition strength, characterization of the inhibitor and characterization of the inhibitor protective layer are investigated. At a fundamental level, this study aims to propose a description of the mechanisms of corrosion of metallic materials in aqueous medium in the absence and in the presence of the inhibitors; more generally, it also aims to contribute to the improvement of the understanding of the corrosion phenomenon for the protection of metallic materials from corrosion by means of inhibitors.