IMPEDANCE OF ANODIC PROCESSES ON Mn5Si3-ELECTRODE IN SULFURIC ACID ELECTROLYTE CONTAINING FLUORIDES
Anodic behavior of Mn5Si3-electrode in 0,5 M H2SO4, containing 0,005 and 0,05 M NaF has been investigated using polarization and impedance measurements. It has been determined that the effect of sodium fluoride that causes the activation of the anodic dissolution of the silicide in a sulfuric acid solution is due to the weakening of the passivating action of oxygen-containing compounds of silicon and oxides of the metal. With increasing of NaF concentration, the role of the metal component and the products of its oxidation in the kinetics of anodic processes on Mn5Si3 increases.