Effects of Ce-containing sol–gel coatings reinforced with SiO2 nanoparticles on the protection of AA2024

Rosero-Navarro, Nataly Carolina; Pellice, Sergio Antonio; Durán, Alicia; Aparicio, Mario

doi:10.1016/j.corsci.2008.01.031

Cited by 165 publications

(114 citation statements)

References 30 publications

(41 reference statements)

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“…Coatings produced using the sol-gel technique can be composed of several oxides whereby various protective properties can be obtained. In the literature, one can find descriptions of coatings containing SiO 2 , ZrO 2 , TiO 2 , as well as a cerium addition [78,79,81,[85][86][87][88][89][90][91][92][93][94][95][96]. Such coatings are used as a substitute for the chromate-based system, mainly to protect steel or aluminium alloys.…”

Section: Hybrid Oxide Coatingsmentioning

confidence: 99%

“…These coatings are enriched with substances improving corrosion resistance, such as cerium incorporated into montmorillonite nanoparticles, MBT or 2-mercaptobenzimidazole (MBI) [92,99]. The self-healing of the coating by means of lanthanides ions takes place as a result of the diffusion of these ions to the substrate surface and the formation of an insoluble layer of oxides and hydroxides (a cathodic inhibitor) [78,79,[85][86][87]. The effectiveness of inhibiting action of Ce(III) and Ce(IV) ions is comparable with that of the Cr(VI) ion [101].…”

Section: Hybrid Oxide Coatingsmentioning

confidence: 99%

“…Self-healing hybrid oxide coatings are produced using the sol-gel technique [78][79][80][81][82], less often by electrodeposition [83], or using plasma techniques [84]. Alcoholates or salts of various metals and silicon are the substrate.…”

Section: Hybrid Oxide Coatingsmentioning

confidence: 99%

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Self-healing coatings in anti-corrosion applications

2013

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Nonmetallic (based on polymers or oxides) and metallic protective coatings are used to protect metal products against the harmful action of the corrosion environment. In recent years, self-healing coatings have been the subject of increasing interest. The ability of such coatings to self-repair local damage caused by external factors is a major factor contributing to their attractiveness. Polymer layers, silica-organic layers, conversion layers, metallic layers and ceramic layers, to mention but a few, are used as self-healing coatings. This paper presents the main kinds of self-healing coatings and explains their selfhealing mechanisms.

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Section: Hybrid Oxide Coatingsmentioning

confidence: 99%

Section: Hybrid Oxide Coatingsmentioning

confidence: 99%

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Self-healing coatings in anti-corrosion applications

2013

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“…[39][40][41] Further, the increased roughness of cerium containing coatings was noticed and ascribed to a superficial agglomeration/precipitation of cerium containing nanoparticles.…”

mentioning

confidence: 99%

“…40,41 When using monolayer sol-gel coating doped with cerium to obtain barrier and active protection, the long-term coating stability can be jeopardized. 16,[40][41][42] Namely, the inhibition effect was observed, but a fast deterioration of the barrier properties of the coating occurred after 24 hours in 0.35 wt% NaCl.16 A multi-layer sol-gel hybrid coating, based on TEOS, methacryloxypropyl trimethoxysilane (MPS), ethylene glycol dimethacrylate (EGDMA) and glycidyl methacrylate (GMA) containing an intermediate cerium doped layer was shown to greatly improve the corrosion properties of AA2024.32 It was further showed that the barrier and active protection of coatings were improved in multi-layer coating, based on TEOS, GPTMS and SiO 2 nanoparticles, where cerium was in the top layer, but the self-healing ability of such coatings applied on carbon steel was not confirmed. 16 In the present work three types of multi-layer hybrid sol-gel coatings were developed based on the inorganic precursor TEOS, organic precursor GPTMS, SiO 2 nanoparticles and corrosion inhibitor Ce(NO 3 ) 3 .…”

mentioning

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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Electrochemical Properties of Melting Gel Coatings

Klein

Degnah

Al-Marzoki

et al. 2016

Advances in Materials Science for Environmental and Energy Technologies V: Ceramic Transactions

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Organic-inorganic melung gel coatings were applied to titanium alloy substrates to decrease their corrosion and extend their lifetime in an eiecirochemical application. Melting gels containing phenyl substitutions were coated onto the substrates. The ratio of diphenyl dimethoxysilane (DPhDMS) to methanol was varied to change the thickness of the coatings. The coadngs were inspected visually to see that there is good adhesion between the coating and the substrate. Nanoindenter tests were performed to determine hardness.

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Effects of Ce-containing sol–gel coatings reinforced with SiO2 nanoparticles on the protection of AA2024

Cited by 165 publications

References 30 publications

Self-healing coatings in anti-corrosion applications

Self-healing coatings in anti-corrosion applications

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

Electrochemical Properties of Melting Gel Coatings

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Effects of Ce-containing sol–gel coatings reinforced with SiO2 nanoparticles on the protection of AA2024

Cited by 165 publications

References 30 publications

Self-healing coatings in anti-corrosion applications

Self-healing coatings in anti-corrosion applications

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

Electrochemical Properties of Melting Gel Coatings

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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