Electrochemical and X-ray photoelectron spectroscopy studies of passive film on tin in citrate buffer solution

Šeruga, Marijan; Metikoš‐Huković, Mirjana; Valla, T.; Milun, M.; Hoffschultz, H.; Wandelt, K.

doi:10.1016/0022-0728(95)04502-3

Cited by 79 publications

(73 citation statements)

References 45 publications

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“…[4][5][6][7][8][9][10][11] In alkaline solutions, the anodic passivation of tin is a complex, multistep process that is due to the presence of an oxide layer on the metal surface. Both the composition and the thickness of the passive film change continuously with potential 5 and pH.…”

Section: Introductionmentioning

confidence: 99%

An electrochemical study of tin oxide thin film in borate buffer solutions

Dı́az¹,

Díez‐Pérez²,

Gorostiza³

et al. 2003

J. Braz. Chem. Soc.

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Neste trabalho, foi estudado o comportamento eletroquímico de estanho policristalino em soluções de tampão borato com pH 7.5, utilizando voltametria cíclica, eletroquímica com microscopia de varredura (EC-STM) e espectroscopia de impedância eletroquímica. Os potenciais do pico principal de redução do óxido e de geração de hidrogênio deslocaram-se de forma sistemática para valores mais negativos quando se aumentou o potencial anódico de formação do filme. Foi discutida a natureza dos diferentes óxidos formados e também foi dada nova atribuição aos processos de oxidação do estanho e de redução de seus óxidos.The electrochemical behavior of tin polycrystals in borate buffer solutions at pH 7.5 was systematically investigated using cyclic voltammetry, EC-STM and electrochemical impedance measurements. A systematic shift to more negative values of the potentials corresponding either to the major reduction peak either to the hydrogen evolution was measured when the anodization potential used for film growth was increased. A discussion about the different oxides there formed was included and a reassignation of tin oxidation and tin oxides reduction processes was given.

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Section: Introductionmentioning

confidence: 99%

An electrochemical study of tin oxide thin film in borate buffer solutions

Dı́az¹,

Díez‐Pérez²,

Gorostiza³

et al. 2003

J. Braz. Chem. Soc.

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“…Asimismo, se reordenan los sitios de adsorción como puede observarse a través de la modificación de los picos de adsorción de H. El ciclado potenciodinámico mejora la estabilización del depósito frente a la oxidación del mismo al aumentar el potencial y lleva el potencial de reposo a 0,6 V valores ligeramente superior al límite de la región de upd. De acuerdo a la bibliografía, los picos de oxidación se pueden asociar a las oxidaciones sucesivas de Sn, sus óxidos o hidróxidos superficiales adsorbidos [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. La existencia de depósitos previos (estabilizados o no) presenta potenciales de circuito abierto menores y una superficie modificada donde el Sn tiende más fácilmente a adsorberse.…”

Section: Discusión De Resultadosunclassified

“…4. Se aprecia picos de oxidación a potenciales superiores a 0,6 V para un depósito recién preparado sin estabilización, mientras que para deposición en etapas múltiples estabilizadas, los picos son leves o mínimos, dándose una deformación de la región de óxidos de Pt [10,11,[25][26][27][28][29][30][31][32][33][34]. Asimismo se realizaron cronopotenciometrías de los depósitos frente a la solución de deposición de Sn 2+ 2 µM en ácido sulfúrico 1 M. Se plantearon tres situaciones básicas: i) el electrodo de Pt pc limpio; ii) un electrodo de Pt/Sn con un depósito de espontáneo sin estabilizar y iii) un electrodo de Pt/Sn con un depósito de espontáneo estabilizado, que se muestran en la Fig.…”

Section: Estabilidad De La Deposición Espontaneaunclassified

“…Otra consideración según la situación específica, es la relativa selectividad por algunos tipos de planos cristalinos en la deposición, según el metal a depositar y el metal base, lo cual condiciona sus posibles capacidades catalíticas [19][20][21][22]. En el caso del Sn las características del depósito formado en las distintas técnicas son discutidas ampliamente, siendo en general descriptas para el estaño como una mezcla de Sn, SnO, SnO 2 , Sn(OH) 2 , principalmente [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. En general, se reporta que los depósitos de Sn se producen en islas sobre estructuras cristalinas de Pt con orientaciones (110), proponiendo que su actividad está asociada a la situación de carga parcial o a la posibilidad de dismutar desde su estado como Sn 2+ [8,39,40].…”

Section: Introductionunclassified

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Characteristics of the spontaneous deposition of Sn in polycrystalline Pt

Yáñez

2012

Port. Electrochim. Acta

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Spontaneous deposition of tin (Sn) in polycrystalline platinum (Pt pc) from a sulfuric acid solution of tin salts, was evaluated by conventional electrochemical techniques, to determine its characteristics. Tin was deposited from a solution of SnCl 2 or SnSO 4 in sulfuric acid 1 M. The degree of surface coating by Sn was calculated by evaluating the region of hydrogen electrosorption through voltammograms performed using solutions containing only the supporting electrolyte, and the supporting electrolyte containing the Sn salt, respectively. The adsorption behavior of tin and oxidation have been studied by the results obtained with platinum electrodes and electrodes of platinum/tin, considering as comparative parameter the adsorption efficiency with respect to the area free of platinum.Keywords: tin, platinum, spontaneous, electrocatalysis, voltammetry. IntroducciónLa modificación de superficies metálicas por deposición de otros metales es una de las técnicas más usuales para la generación y evaluación de nuevos catalizadores. La química verde plantea actualmente una tendencia a la minimización de las energías necesarias para la generación de un nuevo producto, así como la disminución de la toxicidad en su producción. En este sentido, las técnicas electroquímicas son una de las metodologías empleadas, las cuales permiten optimizar la generación de estas superficies metálicas compuestas [1]. Dentro de las técnicas más usuales de obtención de estas superficies por vía electroquímica se encuentra i) el depósito de metales a potenciales positivos con respecto al potencial de la cupla metálica E 0 Mz+/M , llamado depósito a subpotenciales (under potential deposition o upd); ii) la deposición a potenciales

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“…This is the reason why, in the last two decades, several investigations have focused on metal release from tinned containers, as well as on the formation of tinplate passivating films, which can be promoted by foodcontaining organic acids [9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A voltammetric approach to an estimate of metal release from tinplate promoted by ligands present in canned vegetables

et al. 2008

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A linear sweep voltammetric (LSV) approach is proposed for achieving rapid information on metal release from tinned containers into preserved vegetables. Chopped tomato and pea preserves were chosen as prototypes for acid and nearly neutral canned food, respectively. Metal release in these vegetables tinned into both bare and lacquered containers was compared with that found in synthetic samples containing some organic complexing agents (acetic, ascorbic, citric, malic, oxalic, pyroglutamic acids) present in the vegetables considered, thus showing that some of these components affected markedly the metal release in bare cans. These ligands were concomitantly found to also affect LSV profiles recorded in parallel at Sn and Fe electrodes in synthetic samples, causing the starting potential for their oxidation to be lower, the higher the ligand activity of the species considered. The data indicated that metal release and starting potentials for metal discharge are strictly related, so that LSV is able to provide rapid and useful information on the nature of the protective effect (electrochemical or physical) of tin on the steel underlayer, as well as on the extent of Sn and Fe release.

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Electrochemical and X-ray photoelectron spectroscopy studies of passive film on tin in citrate buffer solution

Cited by 79 publications

References 45 publications

An electrochemical study of tin oxide thin film in borate buffer solutions

An electrochemical study of tin oxide thin film in borate buffer solutions

Characteristics of the spontaneous deposition of Sn in polycrystalline Pt

A voltammetric approach to an estimate of metal release from tinplate promoted by ligands present in canned vegetables

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