Effects of Nickel–Aluminum Bronze Pre-Oxidized Films on the Cathodic Kinetics of Oxygen Reduction

The cathodic oxygen reduction kinetics of the freshly polished and the pre-oxidized nickel–aluminum bronze surfaces were investigated in a 3.5 wt.% NaCl solution under steady-state and well-defined hydrodynamic conditions using a rotating disc electrode setup. The diffusion coefficient of the pre-oxidized film specimen of 0.72 × 10⁻⁵ cm² s⁻¹ was lower than that of the freshly polished surface of 2.55 × 10⁻⁵ cm² s⁻¹, a 3.5-fold decrease, demonstrating the extent to which the oxygen diffusion within the pre-oxidized film was hindered.