Semiconductivities of passive films formed on stainless steel bend under erosion-corrosion conditions

Abstract Semiconductivities of passive films at a stainless steel bend in sand-containing NaCl solution under erosion-corrosion (E-C) conditions were investigated by Mott-Schottky analysis. It is demonstrated that higher donor densities and faster diffusivities of point defects within passive film appear at the extrados of the bend. X-ray photoelectron spectroscopy (XPS) analysis reveals that the passive layer at the extrados of bend contains less Fe 3 O 4 and Fe 2 O 3 . The semiconductivities of passive films are strongly dependent on the hydrodynamic characteristics at the bend.