Journal of the Serbian Chemical Society 2013 Volume 78, Issue 12, Pages: 2053-2067
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Change of n-type to p-type conductivity of the semiconductor passive film on N-steel: Enhancement of the pitting corrosion resistance

Metikoš-Huković Mirjana, Grubač Zoran, Omanovic Sasha

The electrochemically-assisted modification of the N-austenitic stainless steel (ASS N25) surface was successfully employed to improve barrier properties of the passive film in a chloride containing solution. The chemical composition, electronic and barrier properties of the surface film before and after the electrochemical treatment were examined using X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). Electrochemical measurements were carried out in a corrosion testing solution. The excellent corrosion resistance (both pitting and general) of the N-steel’s modified surface was discussed according to the Mott-Schottky analysis of the interfacial capacitance of the space charge layer and EIS results. The conductivity change of the surface film from an n- to a p-type in the pitting susceptible region was explained using the XPS analysis and semiconducting properties of the film.

Keywords: stainless steel, corrosion, passive films, metal-oxide semiconductors