ETUDE DES COUCHES MINCES A BASE DE CARBONE PREPAREES PAR ELECTRODEPOSITION

Abstract

The present work is an experimental study of Diamond Like Carbon (DLC) and Ni-doped DLC (DLC/Ni) thin films prepared by electrodeposition on copper substrates from an ethanol-based bath. The study by cyclic voltammetry (CV) allowed us to determine the potential domain of formation of carbon atoms and consequently the mechanism of formation of DLC thin films. Based on the CV results, the kinetics mode and the yield of the reaction have been determined. The chronoamperometry study allowed us to follow the nucleation and growth phenomena of the DLC. We focused on the effect of deposition time and applied potential on the physical characteristics of DLC coatings (deposited mass, thickness of deposits, and deposition rate). The corrosion resistance of the deposits was studied by analyzing the polarization curves through the determination of the electrochemical parameters of corrosion (corrosion current, corrosion potential, polarization resistance). For DLC/Ni thin films, the effect of nickel concentration on different properties (deposited mass, layer thickness, deposition rate) has been determined as well as their behavior with respect to corrosion. Finally, a study by UV-Visible spectroscopy was carried out on the DLC/Ni thin films.