ELECTROCHEMICAL CHARACTERIZATION OF TIN COATINGS

The corrosion behaviour of titanium nitride (TiN) CVD coatings on AISI 316L stainless steel and on inert Si3N4 in hydrochloric acid is studi ed with a.c. and d.c. electrochemical methods. The electrochemical beh aviour of TiN on stainless steel can be divided into active and passiv e behaviour according to the state of the substrate. The measurements indicate that there is an oxide layer on TiN that is responsible for i ts noble electrochemical behaviour. A model that describes the formati on of the oxide layer on TiN in an electrolyte is proposed,