Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11006452 | Applied Surface Science | 2018 | 38 Pages |
Abstract
In 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 0.5â¯M H2SO4â¯+â¯2â¯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 30â¯min. This result was confirmed by its lower impedance values and higher current densities when compared to the 15â²-film. Surface chemistry played a major role on the corrosion behavior of the sputtered films and can be tailored by the deposition time.
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Authors
Marina Fuser Pillis, Mara Cristina Lopes de Oliveira, Renato Altobelli Antunes,