PILLIS, MARINA F.OLIVEIRA, MARA C.L. deANTUNES, RENATO A.2018-12-072018-12-072018PILLIS, MARINA F.; OLIVEIRA, MARA C.L. de; ANTUNES, RENATO A. Surface chemistry and the corrosion behavior of magnetron sputtered niobium oxide films in sulfuric acid solution. <b>Applied Surface Science</b>, v. 462, p. 344-352, 2018. DOI: <a href="https://dx.doi.org/10.1016/j.apsusc.2018.08.123">10.1016/j.apsusc.2018.08.123</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/29336.0169-4332http://repositorio.ipen.br/handle/123456789/29336In this work, magnetron sputtered Nb2O5 films were obtained at two different deposition times. The surface chemistry of the deposited layers was investigated by X-ray photoelectron spectroscopy (XPS). The corrosion behavior was assessed by electrochemical impedance spectroscopy, potentiodynamic polarization and potentiostatic polarization tests in 0.5 M H2SO4 + 2 ppm HF solution at room temperature. The Nb5+/Nb4+ ratio decreased with the deposition time, leading to a higher surface activity for the film obtained at 30 min. This result was confirmed by its lower impedance values and higher current densities when compared to the 15′-film. Surface chemistry played a major role on the corrosion behavior of the sputtered films and can be tailored by the deposition time.344-352openAccessniobium oxidesmagnetronssputteringcorrosionx-ray photoelectron spectroscopysulfuric acidstainless steelscorrosion resistancesurfaceschemistryArtigo de periódico46210.1016/j.apsusc.2018.08.123aguardandohttps://orcid.org/0000-0002-1423-871X84.0590.00