Corrosion protection of fluorzirconate glasses coated by a layer of surface modified tin oxide nanoparticles

• Autor(a) principal: Hammer, Peter [UNESP]
• Data de Publicação: 2006
• Outros Autores: Rizzato, A. P. [UNESP], Alvarez, F., Landers, R., Pulcinelli, Sandra Helena [UNESP], Santilli, Celso Valentim [UNESP]
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.tsf.2005.07.252; http://hdl.handle.net/11449/68857
• topic: Corrosion; Tin oxide; X-ray photoelectron spectroscopy (XPS); Zirconium; Chemical bonds; Glass; Microstructure; Nanostructured materials; Thin films; X ray photoelectron spectroscopy; Zirconium compounds; Fluorozirconate glass; Porous coating; Water corrosion; Corrosion protection

The protection efficiency against water corrosion of fluorozirconate glass, ZBLAN, dip-coated by nanocrystalline tin oxide film containing the organic molecule Tiron® was investigated by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The chemical bonding structure of the surface region and morphology were studied before and after two water exposure periods of 5 and 30 min. The results of the analysis for the as-grown sample revealed a SnO1.6 phase containing carbon and sulfur, related to Tiron®, and traces of elements related to ZBLAN (Zr, F, Ba). This fact and the clear evidence of the presence of tin oxifluoride specie (SnOxF y) indicates a diffusion of the glass components into the porous coating. After water exposure, the increase of the oxygen concentration accompanied by a strong increase of Zr, F, Ba and Na content is interpreted as filling of the nanopores of the film by glass compounds. The formation of a compact protective layer is supported by the morphological changes observed by AFM. © 2005 Elsevier B.V. All rights reserved.