Tin passivation in alkaline media: Formation of SnO microcrystals as hydroxyl etching product

Palacios-Padrós, A.; Caballero‐Briones, F.; Díez‐Pérez, Ismael; Sanz, Fausto

doi:10.1016/j.electacta.2013.07.200

Cited by 46 publications

(25 citation statements)

References 55 publications

(153 reference statements)

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“…Passivation of tin in the presence of NaOH at 0.1 M concentration has been already reported [11,13,36,47]. The linear voltammogram of tin in the À2 to +2 V/MSE potential range is shown in case A of Fig.…”

Section: Passivation Of Tin In Naoh Solutionmentioning

confidence: 93%

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The comparative breakdown of passivity of tin by fluorides and chlorides interpreted through the ‘law of matching affinities’ concept

Trompette

2015

Corrosion Science

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a b s t r a c tThe comparative breakdown of passivity of tin by fluorides and chlorides highlight the significant slower kinetics of attack by the kosmotrope fluoride when compared to the chaotrope chloride at pH 5.7 and 10. The origin of this difference is ascribed to the predominant halide-dependent mechanism of attack, pitting with chlorides and film thinning with fluorides, which is conditioned according to the anion-specific hydration properties.

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Section: Passivation Of Tin In Naoh Solutionmentioning

confidence: 93%

“…Although the exact mechanism leading to passivation still offers debate in the literature, a consensus view is that tin passivity results from the formation of a final SnO 2 layer [40][41][42][43][44][45][46][47].…”

Section: Passivation Of Tin In Naoh Solutionmentioning

confidence: 99%

The comparative breakdown of passivity of tin by fluorides and chlorides interpreted through the ‘law of matching affinities’ concept

Trompette

2015

Corrosion Science

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“…[68] In the production of methanol, 6 electrons are involved in the reaction. [68] In the production of methanol, 6 electrons are involved in the reaction.…”

Section: Commentaries On the Hypothesized Co 2 Reduction Mechanismmentioning

confidence: 99%

“…The latter species produced in Equations (13)-(14) are unstable and may end up forming CH 3 OH. [68] In the production of methanol, 6 electrons are involved in the reaction. Thus, assuming that CO 2 RR in alkaline media generates bicarbonate anions as Equation (12) [8] For CH 3 OH, CO was generated as intermediate after a two pairs of e À þH þ transferred to the adsorbed CO 2 , liberating a water molecule.…”

Section: Commentaries On the Hypothesized Co 2 Reduction Mechanismmentioning

confidence: 99%

Sustainable Membrane‐Coated Electrodes for CO₂ Electroreduction to Methanol in Alkaline Media

2019

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CO 2 electroreduction has high potential to combine carbon capture utilization and energy storage from renewable sources. The key challenge is the construction of highly efficient electrodes giving optimal CO 2 conversion to high-value products. In this regard, research on electrode structures remains as an important task to face. Despite the advancements in gas diffusion electrodes (GDEs) to facilitate CO 2 transfer and electrode efficiency, the catalyst is still vulnerable to be swept by the gas and liquid electrolyte, reducing the stability. We report the fabrication of novel membrane-coated electrodes (MCEs), by coating an anion exchange membrane over a copper (Cu) : chitosan (CS) catalyst layer onto the carbon paper. CS and poly(vinyl) alcohol (PVA) were chosen for membrane preparation and catalyst binder, where Cu was embedded in the polymer matrix as nanoparticles or ion-exchanged in a layered stannosilicate or zeolite Y, to improve their hydrophilic, conductive, mechanical, and environmentally-friendly properties considered relevant to the sustainability of the electrode fabrication and performance. The intimate connection between the CS : PVA polymer membrane over-layer and the CS/Cu catalytic layer protects the MCEs from material losses, enhancing the CO 2 conversion to methanol, even in high alkaline medium. A maximum Faraday Efficiency to methanol of 68.05 % was achieved for the 10CuY/CS : PVA membrane over-layer.

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“…9 This is attributed primarily to the great difficulty in in-situ investigation on the growth kinetics of interfacial layer formed beneath a coating. Electrochemical polarization methods as well as surface analysis techniques are usually employed to study the anodic film formation on bare metal surface, [15][16][17][18] but are inappropriate to characterize the buried interface. Up to now, few studies have been carried out to clarify the growth kinetics of the protective layer, let alone unveil the effect of PANI on the film growth.…”

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confidence: 99%

Growth Behavior of Initial Product Layer Formed on Mg Alloy Surface Induced by Polyaniline

Luo

Wang

Guo

et al. 2015

J. Electrochem. Soc.

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The quality of the interfacial protective layer induced by polyaniline (PANI) has been claimed to play a crucial role for the enhanced corrosion protection of Mg alloy, but its growth behavior is not well understood. Here some composition, structure and growth kinetics of the protective layer formed at the PANI-emeraldine base (EB) coating/AZ91D Mg alloy interface were investigated to explore the growth mechanism. Upon immersion in 0.5 M NaCl solution, the growing interface layer under EB coating exhibited a fast passivation rate and an increased corrosion resistance, which was largely influenced by ion concentration. XPS depth profiles showed that the EB-induced layer was a mixture of MgO and Mg(OH) 2 , in which no significant bi-layer structure existed and MgO was dominant throughout the bulk film. These observations suggest that the interaction between EB and Mg can promote the faster growth of a stable MgO-rich layer mixed with Mg(OH) 2 probably by solid reaction. Meanwhile less hydration of MgO and dissolution-precipitation reaction occur, thus leading to less Mg(OH) 2 in the outer layer. Magnesium alloys have drawn great attention in automotive and aerospace industry due to their excellent properties such as low density and high specific strength. However, limited corrosion resistance of such alloys has retarded their widespread applications. To improve the corrosion resistance of Mg alloys, numerous coating techniques have been explored, among which organic coating containing corrosion inhibiting pigments is an economical and effective method in industry. One important pigment for Mg alloys is polyaniline (PANI) including emeraldine salt form (ES) and emeraldine base form (EB). 1-6Its highly efficient corrosion-protection performance for Mg alloys has been shown to be competitive to a chromate-pigmented coating. Additionally, self-healing capability was also found on a hybrid solgel/PANI coated Mg alloy upon immersing in Harrison's solution, where no pitting or filiform corrosion occurred around the scratched area while a protective layer was formed.8 Sathiyanarayanan et al. 1 and Wang et al. 8 observed that, after an initial decrease upon immersion in corrosive electrolytes, the complex impedance of PANI coated Mg alloy recovered, which was attributed to the formation of a protective layer. The different chemical composition on the EB-induced protective layer surface was already confirmed by X-ray photoelectron spectroscopy (XPS) in comparison with that formed underneath a varnish coating. 2,6The mechanism of PANI promoting a protective layer formation has been mostly supported by extensive studies in various metal systems.9-14 Nevertheless, few works have been done to understand the protective layer growth behavior. The most intractable issue of how the interaction between PANI and metal induces the protective layer growth still remains unsolved.9 This is attributed primarily to the great difficulty in in-situ investigation on the growth kinetics of interfacial layer formed beneath a coating. Electroche...

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Tin passivation in alkaline media: Formation of SnO microcrystals as hydroxyl etching product

Cited by 46 publications

References 55 publications

The comparative breakdown of passivity of tin by fluorides and chlorides interpreted through the ‘law of matching affinities’ concept

The comparative breakdown of passivity of tin by fluorides and chlorides interpreted through the ‘law of matching affinities’ concept

Sustainable Membrane‐Coated Electrodes for CO₂ Electroreduction to Methanol in Alkaline Media

Growth Behavior of Initial Product Layer Formed on Mg Alloy Surface Induced by Polyaniline

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Tin passivation in alkaline media: Formation of SnO microcrystals as hydroxyl etching product

Cited by 46 publications

References 55 publications

The comparative breakdown of passivity of tin by fluorides and chlorides interpreted through the ‘law of matching affinities’ concept

The comparative breakdown of passivity of tin by fluorides and chlorides interpreted through the ‘law of matching affinities’ concept

Sustainable Membrane‐Coated Electrodes for CO2 Electroreduction to Methanol in Alkaline Media

Growth Behavior of Initial Product Layer Formed on Mg Alloy Surface Induced by Polyaniline

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Product

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Sustainable Membrane‐Coated Electrodes for CO₂ Electroreduction to Methanol in Alkaline Media