Surface chemistry and the corrosion behavior of magnetron sputtered niobium oxide films in sulfuric acid solution
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2018
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Applied Surface Science
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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 0.5 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.
Como referenciar
PILLIS, 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. Applied Surface Science, v. 462, p. 344-352, 2018. DOI: 10.1016/j.apsusc.2018.08.123. Disponível em: http://repositorio.ipen.br/handle/123456789/29336. Acesso em: 24 Apr 2024.
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