Area Effects on the Mott-Schottky Behavior of Anodic Films Formed on AISI 304 Stainless Steel

The electronic properties of thick oxide films formed on AISI 304L by hot acid anodizing was investigated using the Mott-Schottky approach. All modified films showed n-type and p-type behavior, depending on the applied potential. The incorporation of molybdate and niobil oxalate during the anodization affected mainly the acceptor concentration. The apparent increase in the dopant concentrations is mainly explained by surface area increase associated to the treatments.