Influence of SiO2/Na2O ratio and temperature on the mechanism of interaction of soluble sodium silicates with porous anodic alumina

Moriamé, P.; Biesemans, Monique; Graeve, Iris De; Terryn, Herman

doi:10.1016/j.surfcoat.2011.08.043

Cited by 18 publications

(25 citation statements)

References 42 publications

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“…Open Circuit Potential (OCP) measurements were performed in a lab setup discussed in a previous publication . The samples were dipped in double walled cells connected to a thermostat.…”

Section: Methodsmentioning

confidence: 99%

“…The aim of the present work is to extend the mechanism of silicate/alumina interaction proposed in previous publications to different types of alkali cations. In particular, the main objective of this work is to understand how the type of alkali metal cation (namely lithium, sodium and potassium) can affect the surface modifications occurring on the oxide layer during immersion in the silicate solution.…”

Section: Introductionmentioning

confidence: 94%

“…In particular, they are commonly used in pre‐treatments of aluminium alloys as cleaners and corrosion inhibitors. A few studies exist on the interaction of silicates with aluminium oxides . Firment et al .…”

Section: Introductionmentioning

confidence: 99%

“…The interaction of sodium silicate with porous anodic alumina was extensively investigated in previous publications . In particular, the interaction of soluble sodium silicate (SiO 2 /Na 2 O = 3.5) with porous anodic alumina was studied, and a phenomenological description of this interaction was given .…”

Section: Introductionmentioning

confidence: 99%

“…It has also been observed that the anodic oxide layer is strongly attacked at SiO 2 /Na 2 O = 1. The effect of the SiO 2 /Na 2 O molar ratio was therefore included in the formulation of the interaction mechanism . As the cation plays an important role in this interaction, it is important to understand how the type of cation may affect the interaction between silicate and aluminium oxide.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the type of alkali metal cation on the interaction of soluble silicates with porous anodic alumina

Graeve

Verbeken

Kestens

et al. 2013

Surface & Interface Analysis

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Aqueous sodium silicate solutions are commonly used in pretreatments of aluminium alloys as cleaners and corrosion inhibitors. Silicate films are a promising alternative for corrosion protection and are able to confer high hydrophilicity to the metal surface. An interaction mechanism of soluble sodium silicates with anodic alumina was proposed in previous publications, where the sodium cation acts as 'bridging' element between the silicate anions and the anodic oxide. In this work, this model of interaction is extended by considering the effect of different types of alkali cations. Porous anodized aluminum oxides were silicate treated by dipping in water-based silicate solutions of different monovalent cations, namely lithium, sodium and potassium. The surface modifications occurring on the oxide layer during immersion in solution are studied as a function of the type of cation at ratio SiO 2 /M 2 O = 1 (M = Li, Na, K) at two different temperatures of the silicate solution (30 C and 70 C). The morphological changes occurring on the oxide surface during immersion are observed by field emission scanning electron microscopy, while the reactions happening at the anodic alumina surface are studied by monitoring the open circuit potential as a function of time. The attack of the oxide layer at low silicon-to-cation ratio is quantified by means of wavelength dispersive X-ray fluorescence.

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“…Open Circuit Potential (OCP) measurements were performed in a lab setup discussed in a previous publication . The samples were dipped in double walled cells connected to a thermostat.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of the type of alkali metal cation on the interaction of soluble silicates with porous anodic alumina

Graeve

Verbeken

Kestens

et al. 2013

Surface & Interface Analysis

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Anti‐corrosive additives for alkaline electrolyte in Al‐air batteries: NH₄VO₃ and polyoxometalates

Atencio

Aviles

Bolaños

et al. 2021

Electrochemical Science Adv

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Aluminum-air batteries are a promising alternative for portable energy storage. However, one of the significant issues in this technology is the corrosion of aluminum in alkaline electrolytes. In this study, we explored heteropolyacids (HPAs) H 5 PMo 11 Al 0.5 V 0.5 O 40 and H 6 PMo 11 AlO 40 as possible anti-corrosive additives in Al7475, Al6062, and Al5052 commercial alloys. We also investigated the anti-corrosive properties of commercial NH 4 VO 3 and ZnO. Concerning HPAs, only H 6 PMo 11 AlO 40 in combination with Al5052 showed anti-corrosive activity. However, ZnO did not present anti-corrosive properties in Al6062 alloy, while NH 4 VO 3 presented anti-corrosive properties for all three alloys. The combination of carboxymethylcellulose with NH 4 VO 3 further improved the anti-corrosive properties in the Al7475 alloy. We observed by using 2D Raman imaging the formation of polymeric forms of tetrahedral V +5 O 4 over the surface of three alloys. The main conclusion of our studies is that NH 4 VO 3 combined with carboxymethylcellulose is a promising anti-corrosive in the alkaline electrolyte of aluminum-air batteries.

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An infrared spectroscopic study of sodium silicate adsorption on porous anodic alumina

Graeve

Mol

Verbeken

et al. 2013

Surface & Interface Analysis

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Sodium silicate solutions, also known as 'water-glass', are used for a wide variety of applications. In particular, they are commonly used in pre-treatments of aluminum alloys as cleaners and corrosion inhibitors. Silicate films are known to be promising for corrosion protection and to confer high hydrophilicity. One of the main issues in the study of the formation of silicate films on metal oxides is the complexity of the anionic speciation in aqueous solution. In this work, the mechanism of sodium silicate interaction with porous anodic alumina and its dependence on the solution characteristics is studied by means of Fourier transformed infrared spectroscopy (FTIR). Grazing angle-FTIR and attenuated total reflection-FTIR are used in order to monitor the chemical changes occurring with time on the surface upon silicate adsorption. The effect of the SiO 2 /Na 2 O molar ratio and the temperature is studied. The role of rinsing is investigated when the alumina surface is washed in water after the silicate treatment. A chemical description of the phenomena occurring during silicate treatment is given.

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Influence of SiO2/Na2O ratio and temperature on the mechanism of interaction of soluble sodium silicates with porous anodic alumina

Cited by 18 publications

References 42 publications

Influence of the type of alkali metal cation on the interaction of soluble silicates with porous anodic alumina

Influence of the type of alkali metal cation on the interaction of soluble silicates with porous anodic alumina

Anti‐corrosive additives for alkaline electrolyte in Al‐air batteries: NH₄VO₃ and polyoxometalates

An infrared spectroscopic study of sodium silicate adsorption on porous anodic alumina

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Influence of SiO2/Na2O ratio and temperature on the mechanism of interaction of soluble sodium silicates with porous anodic alumina

Cited by 18 publications

References 42 publications

Influence of the type of alkali metal cation on the interaction of soluble silicates with porous anodic alumina

Influence of the type of alkali metal cation on the interaction of soluble silicates with porous anodic alumina

Anti‐corrosive additives for alkaline electrolyte in Al‐air batteries: NH4VO3 and polyoxometalates

An infrared spectroscopic study of sodium silicate adsorption on porous anodic alumina

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Product

Resources

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Anti‐corrosive additives for alkaline electrolyte in Al‐air batteries: NH₄VO₃ and polyoxometalates