INVESTIGADORES
FLEXER Victoria
artículos
Título:
Effects of ceria nanoparticle concentrations on the morphology and corrosion resistance of ceriumesilane hybrid coatings on electrogalvanized steel substrates
Autor/es:
ZANDI ZAND, R.; VERBEKEN, K.; VICTORIA FLEXER; ADRIAENS, A.
Revista:
MATERIALS CHEMISTRY AND PHYSICS
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Lugar: Amsterdam; Año: 2014 vol. 145 p. 450 - 460
ISSN:
0254-0584
Resumen:
This work investigates the effect of the ceria nanoparticle concentration on the morphology and electrochemical behavior of ceriumesilane hybrid coatings deposited on electro-galvanized steel substrates.The substrates were pre-treated with 3-glycidoxypropyl-trimethoxysilane and bisphenol A, modified with cerium ion-activated CeO2 nanoparticles. The morphology of the coating before and after corrosion tests was examined using atomic force microscopy and scanning electron microscopy. The results indicate the formation of nanostructured surfaces with relatively uniform thicknesses and nanoparticle distribution. Microscopic observations explain the increased durability of the silane coating doped with the lowest content of activated ceria nanoparticles after short-term corrosion tests (456 h). The corrosion behavior of the solegel coatings was also investigated using natural salt spray tests, electrochemical impedance spectroscopy, and potentiodynamic polarization tests. The results show that the concentration of  nanoparticles has a significant impact on the barrier properties of the silane films, which are improved for films with lower nanoparticle contents.