Effect of cerium on structure modifications of a hybrid sol–gel coating, its mechanical properties and anti-corrosion behavior

Cambon, Jean-Baptiste; Esteban, Julien; Ansart, Florence; Bonino, Jean-Pierre; Turq, Viviane; Santagneli, Silvia H.; Santilli, Chiara; Pulcinelli, Sandra Helena

doi:10.1016/j.materresbull.2012.08.034

Cited by 70 publications

(59 citation statements)

References 49 publications

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“…Some of the most effective and environmentally friendly inhibitors are derived from cerium salts [119,[125][126][127]. Good results have also been reported with aluminum polyphosphate [128].…”

Section: Corrosion Protective Sol-gel Coatings In Aluminium Substratesmentioning

confidence: 99%

“…Doping the hybrid sol-gel coatings with corrosion inhibitors in order to reproduce a corrosion self-healing ability of chromate conversion layers is another way to improve sol-gel coatings' corrosion performance aiming at the replacement of the toxic Cr(VI) surface treatments. Some of the most effective and environmentally friendly inhibitors are derived from cerium salts [119,[125][126][127]. Good results have also been reported with aluminum polyphosphate [128].…”

Section: Corrosion Protective Sol-gel Coatings In Aluminium Substratesmentioning

confidence: 99%

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Hybrid Sol-Gel Coatings: Smart and Green Materials for Corrosion Mitigation

et al. 2016

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Corrosion degradation of materials and metallic structures is one of the major issues that give rise to depreciation of assets, causing great financial outlays in their recovery and or prevention. Therefore, the development of active corrosion protection systems for metallic substrates is an issue of prime importance. The promising properties and wide application range of hybrid sol-gel-derived polymers have attracted significant attention over recent decades. The combination of organic polymers and inorganic materials in a single phase provides exceptional possibilities to tailor electrical, optical, anticorrosive, and mechanical properties for diverse applications. This unlimited design concept has led to the development of hybrid coatings for several applications, such as transparent plastics, glasses, and metals to prevent these substrates from permeation, mechanical abrasion, and corrosion, or even for decorative functions. Nevertheless, the development of new hybrid products requires a basic understanding of the fundamental chemistry, as well as of the parameters that influence the processing techniques, which will briefly be discussed. Additionally, this review will also summarize and discuss the most promising sol-gel coatings for corrosion protection of steel, aluminium, and their alloys conducted at an academic level.

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Section: Corrosion Protective Sol-gel Coatings In Aluminium Substratesmentioning

confidence: 99%

Section: Corrosion Protective Sol-gel Coatings In Aluminium Substratesmentioning

confidence: 99%

Hybrid Sol-Gel Coatings: Smart and Green Materials for Corrosion Mitigation

et al. 2016

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“…free volumes in the hybrid network, as will be described below. [44][45][46] SEM/EDS analysis.-The morphology and composition of different coatings applied on AA7075-T6 were investigated by SEM/EDS analysis ( Fig. 2, Table I).…”

Section: Resultsmentioning

confidence: 99%

Self-Healing Effect of Hybrid Sol-Gel Coatings Based on GPTMS, TEOS, SiO₂Nanoparticles and Ce(NO₃)₃Applied on Aluminum Alloy 7075-T6

Tiringer

Durán

Castro

et al. 2018

J. Electrochem. Soc.

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Aluminum alloy AA7075-T6 is most commonly used in the aircraft and automotive industries. Due to the presence of intermetallic particles, AA7075-T6 is susceptible to localized corrosion in chloride solutions. In the present work multilayer hybrid sol-gel coatings, based on silane precursors 3-glycidyloxypropyl(trimethoxysilane) (GPTMS) and tetraethoxysilane (TEOS), were used to protect AA7075-T6 from corrosion. To enrich the barrier properties of the coating, SiO 2 nanoparticles were added to the GPTMS/TEOS sol-gel solution. Inhibition and a self-healing effect were achieved by doping Ce(NO 3 ) 3 in the coating. A multi-layer system was applied on the substrate composed of a first layer doped with Ce(NO 3 ) 3 and the second, undoped sol-gel layer. The addition of cerium increases the lifespan of hybrid sol-gel coating and has a role in self-healing if it is locked within the first layer of the multilayer coating. The self-healing effect was confirmed by immersion of unscribed and scribed coated substrates in 0.1 mol/L NaCl by using the immersion test, electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscopy with chemical analysis. Due to increasing demand for light-weight metals to reduce fuel consumption and, consequently, CO 2 emission, aluminum alloy AA7075-T6 is very attractive in automotive and aircraft industries. In addition to its low density, its advantages are high strength-to-weight ratio and good mechanical properties.1-3 However, due to the presence of zinc and copper intermetallic particles, AA7075-T6 readily undergoes localized corrosion, which limits its use in more aggressive environments. Chromate conversion coatings (CCCs), which were used for decades as providing the most effective corrosion protection of aluminum alloys, are limited, in the European Union. 4 Many surface treatments have been proposed to replace CCCs, the sol-gel process being one of the most promising and environmentally friendly. [5][6][7][8][9][10][11][12] In hybrid sol-gel coatings, which combine inorganic and organic compounds, the inorganic compound provides mechanical support, while the organic compound adds to flexibility and decreases treatment temperature. 8,[12][13][14][15] Hybrid sol-gel coatings achieve protection of underlying substrate by acting as barrier coatings. Addition of silica nanoparticles (SiO 2 ) into sol-gel coating has been reported to additionally increase the barrier effect by increasing the coating thickness, density and reinforcement. [16][17][18][19][20][21][22][23] Still, if these coatings do not contain corrosion inhibitors they lack the ability to inhibit the corrosion process once it commences, i.e. they do not show active inhibition ability resulting in a self-healing of the coating.To obtain an active corrosion protection, corrosion inhibitors can be incorporated into sol-gel coating. According to Hinton et al., 24,25 4 and insoluble CeO 2 , which acts as a protective barrier to oxygen and lowers the cathodic activity by hindering the ...

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“…This peak reduces its area with the plasticizer addition. [21][22][23] . Table 1 shows the peak localization in ppm for 29 Si NMR spectrum of the different T i and Q i species present in the hybrid structures.…”

Section: And 29mentioning

confidence: 99%

Effect of concentrations of plasticizers on the sol-gel properties developed from alkoxides precursors

et al. 2017

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Effect of cerium on structure modifications of a hybrid sol–gel coating, its mechanical properties and anti-corrosion behavior

Cited by 70 publications

References 49 publications

Hybrid Sol-Gel Coatings: Smart and Green Materials for Corrosion Mitigation

Hybrid Sol-Gel Coatings: Smart and Green Materials for Corrosion Mitigation

Self-Healing Effect of Hybrid Sol-Gel Coatings Based on GPTMS, TEOS, SiO₂Nanoparticles and Ce(NO₃)₃Applied on Aluminum Alloy 7075-T6

Effect of concentrations of plasticizers on the sol-gel properties developed from alkoxides precursors

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Effect of cerium on structure modifications of a hybrid sol–gel coating, its mechanical properties and anti-corrosion behavior

Cited by 70 publications

References 49 publications

Hybrid Sol-Gel Coatings: Smart and Green Materials for Corrosion Mitigation

Hybrid Sol-Gel Coatings: Smart and Green Materials for Corrosion Mitigation

Self-Healing Effect of Hybrid Sol-Gel Coatings Based on GPTMS, TEOS, SiO2Nanoparticles and Ce(NO3)3Applied on Aluminum Alloy 7075-T6

Effect of concentrations of plasticizers on the sol-gel properties developed from alkoxides precursors

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Self-Healing Effect of Hybrid Sol-Gel Coatings Based on GPTMS, TEOS, SiO₂Nanoparticles and Ce(NO₃)₃Applied on Aluminum Alloy 7075-T6