Protective glass coatings on metallic substrates

Sanctis, O. de; Gómez, Liliana; Pellegri, N.; Parodi, C.; Marajofsky, A.; Durán, Alicia

doi:10.1016/0022-3093(90)90155-f

Cited by 155 publications

(78 citation statements)

References 3 publications

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“…In order to guarantee crack-free film formation, film thickness must be less than 2.0 µm for vapor-oxidized film 7,14) . The film thickness can be controlled using the method of coating of PHPS, the number of coats and the concentration of the solution, in accordance with the properties of the surface of the object to be coated and the purpose of the coating 14) .…”

Section: Discussionmentioning

confidence: 99%

“…Coatings produced by depositing silica are widely used to create gas barriers, chemical corrosion resistance, electrical isolation, mechanical hardness, and various optical features 5,[7][8][9] . Silica coating of steel and plastic materials with silicon alkoxides, such as tetraethylorthosilicate (TEOS: Si(OC2H5)4), has been shown to improve corrosion-resistance and heatresistance of the base materials 10,11) .…”

Section: Introductionmentioning

confidence: 99%

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Silica film coating method for veneering resin composite

et al. 2011

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The preceramic polymer perhydropolysilazane (PHPS) is an attractive candidate as a coating material to prevent discoloration of veneering resin composites. At the present time, however, a practical method to apply this material is not available. The purpose of this study was to establish a low-temperature method for applying a silica film coating to a veneering resin composite. Two types of PHPS, NP and NL, were coated onto a veneering resin composite. The specimens were exposed to hydrogen peroxide vapor at 97˚C, and the state of the conversion process was evaluated using FT-IR. With exposure to the hydrogen peroxide vapor, a 0.5-µm-thick silica film similar to that produced by baking was formed on the surface of the NP samples in 10 min, while a 0.2-µm-thick film was formed on the NL in 15 min. The silica coating method described in this study may mitigate the discoloration of veneering resin composite.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Silica film coating method for veneering resin composite

et al. 2011

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“…Se han usado diferentes ácidos (HCl, HNO 3 , H 2 SO 4 , AcH), con los que se ha ajustado el pH a valores de 2-3.…”

Section: Methodsunclassified

“…Mediante la utilización del proceso sol-gel, se pueden conseguir capas densas, sin defectos y resistentes al rayado [2,3]. Este método no es muy costoso, es fácil de aplicar y posee la gran ventaja de permitir la sinterización a temperaturas tan bajas como 500ºC [4].…”

Section: Introductionunclassified

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Recubrimientos sol-gel obtenidos por deposición electroforética (EPD) sobre metales

Castro¹,

Ferrari²,

Moreno³

et al. 2000

Bol. Soc. Esp. Ceram. Vidr.

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El proceso sol-gel es un método de gran interés para la producción de películas vítreas sobre metales, que actúan como barrera protectora frente a la oxidación y aumentan su resistencia a la corrosión. Se han obtenido recubrimientos inorgánicos e híbridos de distintas composiciones sobre distintos metales usando técnicas como inmersión, centrifugado y pulverización. Aunque estos métodos proporcionan recubrimientos con buenas propiedades los espesores obtenidos son bajos (inferiores a 2 mm), lo que limita sus posibilidades de aplicación. La deposición electroforética (EPD) se perfila como una técnica de gran versatilidad para la obtención de recubrimientos homogéneos de mayor espesor. El objetivo de este trabajo es la preparación de recubrimientos sobre metal por EPD a partir de soluciones híbridas de SiO 2 (TEOS, MTES) y de suspensiones coloidales de SiO 2 en las que las propias soluciones híbridas actúan como medio de dispersión. Tanto las soluciones como las suspensiones se han estudiado mediante medidas de viscosidad, densidad y conductividad. Asimismo, se han estudiado los pará-metros físicos asociados a la EPD, tales como el tiempo de deposición y la densidad de corriente, teniendo en cuenta el efecto adicional de formación de capa por inmersión durante la extracción. Los recubrimientos se han caracterizado mediante perfilometría y microscopía óptica, comparando las capas depositadas por inmersión y las obtenidas por EPD. Palabras Clave: Sol-gel, recubrimientos, inmersión, deposición electroforética, sílice coloidal. Sol-gel coatings obtained from electrophoretic depositions (EPD) on metalsSol-gel process is a suitable method for the production of glass-like coatings onto metals, acting as barrier against oxidation and providing an increased resistance to corrosion. Hybrid and inorganic coatings of different compositions have been used for coating several metals by using techniques like dipping, spin-coating and spraying. Although these methods lead to good properties the final coatings are restricted by the thin thickness (up to 2 µm), thus limiting the application range. Electrophoretic deposition (EPD) is considered a highly versatile technique for producing homogeneous thicker coatings. The aim of this work deals with the preparation of coatings onto metals by EPD from hybrid silica sols (TEOS, MTES) and from colloidal silica suspensions where the hybrid sols constitute the suspending medium. Both the solutions and the suspensions have been studied in terms of viscosity, density and conductivity. Furthermore, the physical parameters associated to EPD, such as deposition time and current density, have been also studied, taking into account the additional contribution to the layer formed by EPD occurring by dipping during withdrawal. The coatings obtained by dipping and by EPD have been characterised by perfilometry and optical microscopy.Key words: Sol-gel, coatings, dipping, electrophoretic deposition, colloidal silica. INTRODUCCIÓNLa exposición de metales a condiciones de pH agresivas, a la presencia ...

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XPS, SEM and TEM characterization of stainless-steel 316L surfaces after electrochemical etching and oxidizing

Stefanov

Stoychev

Stoycheva

et al. 1999

Surf. Interface Anal.

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Characterization of the structure and chemical composition of nickel oxide films formed on AISI 316L stainless steel by electrochemical anodic treatment in an aqueous electrolyte containing 560 g l−1 NaOH was made by electron microscopy and x‐ray photoelectron spectroscopy (XPS). The depth chemical composition, thickness and duplex character of the oxide layers were determined by XPS sputter profiles using 3 keV Ar+ ions. The thickness of these layers was found to depend on the electrochemical conditions (current density or working time of the electrolyte). Ageing and heating changed significantly the structure and chemical composition of the layers. Copyright © 1999 John Wiley & Sons, Ltd.

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Protective glass coatings on metallic substrates

Cited by 155 publications

References 3 publications

Silica film coating method for veneering resin composite

Silica film coating method for veneering resin composite

Recubrimientos sol-gel obtenidos por deposición electroforética (EPD) sobre metales

XPS, SEM and TEM characterization of stainless-steel 316L surfaces after electrochemical etching and oxidizing

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