Papers by Author: Mihaela Mindroiu

Abstract: The paper presents the results of the electrochemical and surface study concerning the binder influence on protective properties of paint coatings. The protective films realized with various binders were applied on carbon steel substrate. The experiments carried out in a 3% NaCl solution, normal aerated at the room temperature. The experimental results show that the paint films containing binders with three-dimensional (3D) structure provide good protective properties. The best performance is exhibited by the paint films with the alkyd binder, due to their 3D structure formed as a result of chemical reactions of the binder with the oxygen from atmosphere during the curing process.

Abstract: In this paper both electrochemical and surface analysis technique, were performed in order to elaborate and investigate hybrid polymeric composite materials based on polypyrrole (PPy). SEM micrographs of PPy films obtained on zinc chromate electrode presented a cauliflower-like structure. The anticorrosive properties of composite coatings based on polypyrrole were improved using a pre-treatment with chromium salts on the zinc-coated steel surfaces.

Abstract: In this paper the elaboration and characterization of polypyrrole coatings on active metallic surfaces were performed. The one-step electropolymerization of pyrrole on zinc-coated steel electrodes was investigated under several techniques (cyclic voltammetry, electrochemical impedance spectroscopy, atomic force microscopy) in aqueous medium. Adherent and homogeneous PPy coatings were obtained using tartrate counter-ions. The obtained results show that the PPy coatings increase the corrosion potential and reduce the corrosion current.