Titanium oxynitride thin films sputter deposited by the reactive gas pulsing process

International audienc

Heat Treated NiP–SiC Composite Coatings: Elaboration and Tribocorrosion Behaviour in NaCl Solution

Tribocorrosion behaviour of heat-treated NiP and NiP–SiC composite coatings was investigated in a 0.6 M NaCl solution. The tribocorrosion tests were performed in a linear sliding tribometer with an electrochemical cell interface. It was analyzed the influence of SiC particles dispersion in the NiP matrix on current density developed, on coefficient of friction and on wear volume loss. The results showed that NiP–SiC composite coatings had a lower wear volume loss compared to NiP coatings. However, the incorporation of SiC particles into the metallic matrix affects the current density developed by the system during the tribocorrosion test. It was verified that not only the volume of co-deposited particles (SiC vol.%) but also the number of SiC particles per coating area unit (and consequently the SiC particles size) have made influence on the tribocorrosion behaviour of NiP–SiC composite coatings

Étude de la tribocorrosion du nickel et de l’acier 316 en milieu H

Nous avons réalisé des essais de tribocorrosion sur le nickel et l’acier inoxydable 316 en milieu H2SO4 1 N. Les expériences ont été conduites à l’aide d’un dispositif permettant d’effectuer des essais de frottement sous potentiel imposé. Les résultats expérimentaux montrent que les mécanismes de frottement et d’usure dépendent fortement du potentiel électrochimique du matériau testé. Lorsque l’échantillon métallique subit simultanément la corrosion électrochimique et l’usure par frottement, l’effet de synergie entre ces deux mécanismes de dégradation conduit à une importante perte de matière

Black coatings: a review

Black coatings are widely used in numerous applications e.g., decorative coatings, solar panels, optical instruments. The films are mostly prepared by liquid phase deposition or vapor phase deposition. In this paper we review the techniques of deposition and the properties of the most important black coatings. Optical properties are particularly presented and discussed