EIS and XPS studies on the self-healing properties of Ce-modified silica-alumina hybrid coatings: Evidence for Ce(III) migration

Lakshmi, R.V.; Aruna, S. T.; Anandan, C.; Bera, Parthasarathi; Sampath, S.

doi:10.1016/j.surfcoat.2016.11.051

Cited by 61 publications

(29 citation statements)

References 38 publications

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“…[19][20][21] Moreover, the weak peaks at 2925 and 2856 cm À1 (Fig. S3 †), assigned to the asymmetric and symmetric stretching vibrations of the -CH 2group in the alkyl chain, 24 demonstrates the presence of the aliphatic carboxylic groups as chelating agents on the surface of Ce-PA-p. In contrast, there is no residue of chelating carboxylic groups on the surface of Ce-EA-p or Ce-EA since no peaks related with -COO À group was detected.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of CeO₂ assemblies through interaction with short-chain dicarboxylic acids under facile hydrothermal conditions

Huang

2019

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Synthesis of CeO₂ assemblies through interaction with short-chain dicarboxylic acids under facile hydrothermal conditions

Huang

2019

RSC Adv.

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“…62 Taking into account that two types of oxide/hydroxide are formed (Aland Ce-based), oxygen peak could be curve fitted by additional OH − and/or O 2− component, as proposed previously. 50,63 Further study using well prepared standards would be required to corroborate further differentiation between two components. After 14 days of immersion, however, cerium was not identified within the scribe (Fig.…”

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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“…Meanwhile, the peak shift of O and Si element were around 0.22 and 0.23 eV, respectively, and the results could be considered as reasons for the instrument error. From the above analysis results, the functional groups of O and Si element in SG-2 had no change, comparing with the functional groups of O and Si element in SG-1 (Demchenko et al, 2017;Lakshmi et al, 2017). In addition, the primary cause of hydrophobicity was determined that the hydroxyl and carboxyl of carbon atoms had been removed after modification.…”

Section: Adsorption Propertiesmentioning

confidence: 93%

Adsorption performance of hydrophobically modified silica gel for the vapors of n-hexane and water

Huang

Wang

et al. 2017

Adsorption Science & Technology

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An ordinary silica gel (SG-1) was chosen as the raw material and hydrophobically modified with trimethylchlorosilane under different microwave exposure. The orthogonal experiment was designed to screen the optimized modification method. The hydrophobic properties modified silica gel (SG-2) was analyzed by comparing the difference changes of surface chemistries. Then, the adsorption capacities of SG-1 and SG-2 to the n-hexane vapor and water vapor, respectively, were investigated and compared with the capacities of activated carbon and SG-3 (hydrophobically modified using the same composite modifier without microwave exposure). Meanwhile, there cyclable adsorptions of SG-2 to the two vapors were conducted while the desorptions of vacuum and heat was observed. The results showed that the effect of hydrophobic modification to SG-1 under microwave exposure was obvious and SG-2 also had a very good effect of adsorption for the n-hexane vapor. The modified silica gel shows great potential and effect for the recovery of volatile organic compounds with high content of water.

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EIS and XPS studies on the self-healing properties of Ce-modified silica-alumina hybrid coatings: Evidence for Ce(III) migration

Cited by 61 publications

References 38 publications

Synthesis of CeO₂ assemblies through interaction with short-chain dicarboxylic acids under facile hydrothermal conditions

Synthesis of CeO₂ assemblies through interaction with short-chain dicarboxylic acids under facile hydrothermal conditions

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

Adsorption performance of hydrophobically modified silica gel for the vapors of n-hexane and water

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EIS and XPS studies on the self-healing properties of Ce-modified silica-alumina hybrid coatings: Evidence for Ce(III) migration

Cited by 61 publications

References 38 publications

Synthesis of CeO2 assemblies through interaction with short-chain dicarboxylic acids under facile hydrothermal conditions

Synthesis of CeO2 assemblies through interaction with short-chain dicarboxylic acids under facile hydrothermal conditions

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

Adsorption performance of hydrophobically modified silica gel for the vapors of n-hexane and water

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Product

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Synthesis of CeO₂ assemblies through interaction with short-chain dicarboxylic acids under facile hydrothermal conditions

Synthesis of CeO₂ assemblies through interaction with short-chain dicarboxylic acids under facile hydrothermal conditions

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