Preparation and electrochemical study of cerium–silica sol–gel thin films

Garcı́a-Heras, Manuel; Jiménez-Morales, Antonia; Casal, Blanca; Galván, J.C.; Radzki, S.; Villegas, M.

doi:10.1016/j.jallcom.2004.03.047

Cited by 194 publications

(104 citation statements)

References 11 publications

(13 reference statements)

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“…These samples showed two time constants: one time constant at a high frequency range, which was associated with the barrier resistance of the hybrid film, and the other constant representing medium to low frequency range elements, which were attributed to the presence of an oxide on the metal/coating interface. This behavior was observed by other authors 40,41 .…”

Section: New Sol-gel Formulations To Increase the Barrier Effect Of Asupporting

confidence: 88%

New Sol-gel Formulations to Increase the Barrier Effect of a Protective Coating Against the Corrosion and Wear of Galvanized Steel

et al. 2015

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This study proposes a new pretreatment method that uses alkoxide precursors with a plasticizing agent; the purpose of this study is to improve the electrochemical and mechanical properties of a galvanized steel surface. Galvanized steel was covered with a hybrid film obtained from a sol that consisted of two alkoxide precursors, 3 -(trimethoxysilylpropyl) methacrylate (TMSM) and tetraethoxysilane (TEOS), with nitrate cerium in a concentration of 0.01 M and a polyethylene glycol (PEG) plasticizer. The hybrid coatings were obtained by dip-coating method with various concentrations of plasticizer (0, 20, 40 and 60 g.L -1 ). The hybrid films were analyzed by scanning electron microscopy (SEM), profilometry, contact angle measurements, a tribometer with the type-setting ball on the plate and electrochemical tests. The addition of the plasticizer into the hybrid films improves the corrosion resistance behavior compared to the sample without the plasticizer. The addition of 20 g.L -1 of plasticizer showed the best performance in the electrochemical tests. The mechanical behavior results indicated that higher PEG concentrations resulted in films with enhanced durability.

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Section: New Sol-gel Formulations To Increase the Barrier Effect Of Asupporting

confidence: 88%

New Sol-gel Formulations to Increase the Barrier Effect of a Protective Coating Against the Corrosion and Wear of Galvanized Steel

et al. 2015

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“…The anticorrosive performance of the Ce 3+ ions entrapped in the resulting hybrid silica sol-gel network occurs by means of the inhibitor effect and the self-healing mechanism (probably due to the Ce(OH) 3 precipitation) [36]. Recently, Harb et al have reported a similar study where they also correlated the structural properties of cerium doped organic-inorganic hybrid coatings with their efficiency for the corrosion protection of carbon steel.…”

Section: Introductionmentioning

confidence: 97%

Native Oxide Films on AZ31 and AZ61 Commercial Magnesium Alloys – Corrosion Behaviour, Effect on Isothermal Oxidation and Sol–gel Thin Film Formation

Feliú¹,

hadad²,

Barranco³

et al. 2015

New Trends in Alloy Development, Characterization and Application

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The authors present a review of their recent research work in an endeavour to interpret the influence of native oxide films on the corrosion behaviour of commercial AZ31 and AZ61 magnesium alloys or on the oxidation kinetics in air at 200°C. The tendency of some of these thin films to be sufficiently protective in mild or weak corrosive environments is examined. For obtaining oxide films with different protective properties, some of the specimens are tested with the surface in the as-received condition, while others are tested immediately after mechanical polishing. The technique applied to characterise thin (thickness of just a few nanometres) oxide films present on the surface of alloys has basically been XPS (X-ray photoelectron spectroscopy) in combination with ion sputtering. Oxidation resistance of the alloys is quantified by thermo gravimetric (TG) curves and their corrosion rate is evaluated by Electrochemical Impedance Spectroscopy (EIS) and hydrogen evolution measurement in chloride solutions with different aggressivity. Emphasis is placed on the possible effects of: (a) the different thickness of the native oxide films formed on the polished surfaces on the corrosion behaviour of the alloys; and (b) the different film homogeneity and uniformity on the oxidation results. Finally, an attempt will be made to learn more about the influence of the native oxide films that cover the substrate on the subsequent growth and protective behaviour of the sol-gel coatings.

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“…Chan et al obtained three kinds of hybrids using TEOS, MTES, vinyltriethoxysilane (VTES) and GPTMS, they demonstrated that the introduction of unhydrolizable organic groups increased the module and the hardness [9]. The group of J.C. Galván have develop hybrid organicinorganic sol-gel coatings using a-methacryloxypropyltrimethoxysilane (MAP) and tetramethoxysilane (TMOS) loaded with inorganic particles such as titania or cerium that enhance the corrosion properties of sol-gel [12,13].…”

Section: Introductionmentioning

confidence: 99%

Study of the thermal degradation of bioactive sol–gel coatings for the optimization of its curing process

Hernández-Escolano

Ramis

Jiménez-Morales

et al. 2011

J Therm Anal Calorim

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Abstract:A set of materials has been prepared by sol-gel process containing different quantities of hydroxyapatite (0, 2.5 and 5% HAp w/w) using as silica precursors glycidyloxypropyltrimethoxysilane (GPTMS) and tri-ethoxyvinylsilane (VTES). In order to optimize the curing process to obtain sintherized systems (inorganic network) or hybrid systems (organic-inorganic) a TG and FTIR studies have been developed and degradation kinetic triplet parameters were obtained (the activation energy, pre-exponential factor, and function of degree of conversion). The kinetic study was analyzed by means of an integral isoconversional non-isothermal procedure (model free), and the kinetic model was determined by the Coats-Red-fern method and through the compensation effect (IKR). All the systems followed the n = 6 kinetic model. The addition of HAp increases the thermal stability of the systems. The isothermal degradation was simulated from non-isothermal data, and the curing process could be defined to obtain the two types of materials. Temperature under 250 º C allows the formation of hybrids networks.

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Preparation and electrochemical study of cerium–silica sol–gel thin films

Cited by 194 publications

References 11 publications

New Sol-gel Formulations to Increase the Barrier Effect of a Protective Coating Against the Corrosion and Wear of Galvanized Steel

New Sol-gel Formulations to Increase the Barrier Effect of a Protective Coating Against the Corrosion and Wear of Galvanized Steel

Native Oxide Films on AZ31 and AZ61 Commercial Magnesium Alloys – Corrosion Behaviour, Effect on Isothermal Oxidation and Sol–gel Thin Film Formation

Study of the thermal degradation of bioactive sol–gel coatings for the optimization of its curing process

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