Abstract
A potentiostatic transient study was made on the passivation of tungesten carbide alloy in NaNO3 solution. The initial stage of the passivation process was discussed in terms of the current-time relation. The oxides formed were stripped from the specimen surface with constant current stripping pulse. The amount of charge associated with oxide layer was determined as a function of the working parameters such as current density, electrode potential and machining time.
