Electrochemical behaviour of SiO2 sol-gel coatings on stainless steel

Damborenea, J. de; Pellegri, N.; Sanctis, O. de; Durán, Alicia

doi:10.1007/bf00488379

Cited by 70 publications

(44 citation statements)

References 8 publications

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“…The majority of studies were on the protection of stainless steels AISI 304, 310, 430, 316L (Shane 1990;Sanctis 1990, Atik 1992Damborenea 1995;Gallardo 2000), followed by aluminium and its alloys (Kato 1993Hirai 1998Voevodin. 2001aVoevodin.…”

Section: Sol-gel Protective Coatingsmentioning

confidence: 99%

“…These microstructural changes increase the sensitivity to intergranular attack, with the corresponding loss of their properties. In order to determine the influence of the sintering treatment on the metal substrate, sensitization experiments were conducted by measuring polarisation in mixtures of 0.5 M H 2 SO 4 + 0.01 M KSCN on steels treated at maximum temperatures of 500ºC for 1 hour (Damborenea 1995). The test is based on the EPR method (electrolytic potentiodynamic polarisation) and it consists of polarizing from the corrosion potential (E corr ) in an anodic direction until the passivation region is reached.…”

Section: Inorganic Coatings On Different Substratesmentioning

confidence: 99%

See 1 more Smart Citation

Sol–Gel Protective Coatings for Metals

Durán

Castro

Conde

et al. 2016

Handbook of Sol-Gel Science and Technology

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Section: Sol-gel Protective Coatingsmentioning

confidence: 99%

Section: Inorganic Coatings On Different Substratesmentioning

confidence: 99%

Sol–Gel Protective Coatings for Metals

Durán

Castro

Conde

et al. 2016

Handbook of Sol-Gel Science and Technology

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“…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]. Se ha comprobado experimentalmente que estos recubrimientos confieren un carácter protector a los sustratos metálicos [5]. La producción de capas a partir de soluciones híbridas de sílice TEOS/MTES usando la técnica de inmersión conduce a espesores críticos de 2 µm.…”

Section: Introductionunclassified

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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“…Sol-gel coatings are typically in the nano to few microns thickness range. Thick coatings are susceptible to cracking, due to the stress generated during drying and thermal treatment [9]. Stresses can be generated due to shrinkage and thermal expansion mismatch [10].…”

Section: Introductionmentioning

confidence: 99%

Silica-Based Sol-Gel Coating on Magnesium Alloy with Green Inhibitors

et al. 2017

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Abstract:In this work, the performances of several natural organic inhibitors were investigated in a sol-gel system (applied on the magnesium alloy Mg AZ31B substrate). The inhibitors were quinaldic acid (QDA), betaine (BET), dopamine hydrochloride (DOP), and diazolidinyl urea (DZU). Thin, uniform, and defect-free sol-gel coatings were prepared with and without organic inhibitors, and applied on the Mg AZ31B substrate. SEM and EDX were performed to analyze the coating surface properties, the adhesion to the substrate, and the thickness. Electrochemical measurements, including electrochemical impedance spectroscopy (EIS) and anodic potentiodynamic polarization scan (PDS), were performed on the coated samples to characterize the coatings' protective properties. Also, hydrogen evolution measurement-an easy method to measure magnesium corrosion-was performed in order to characterize the efficiency of coating protection on the magnesium substrate. Moreover, scanning vibrating electrode technique (SVET) measurements were performed to examine the efficiency of the coatings loaded with inhibitors in preventing and containing corrosion events in defect areas. From the testing results it was observed that the formulated sol-gel coatings provided a good barrier to the substrate, affording some protection even without the presence of inhibitors. Finally, when the inhibitors' performances were compared, the QDA-doped sol-gel was able to contain the corrosion event at the defect.

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Electrochemical behaviour of SiO2 sol-gel coatings on stainless steel

Cited by 70 publications

References 8 publications

Sol–Gel Protective Coatings for Metals

Sol–Gel Protective Coatings for Metals

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

Silica-Based Sol-Gel Coating on Magnesium Alloy with Green Inhibitors

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