Disruption processes in films grown and reduced electrochemically on metals

D’Alkaine, C.V.; Garcı́a, Carmen; Brito, Gilberto Augusto de Oliveira; Pratta, Patricia Maria Patrizi; Fernandes, Felipi Pablo Damasceno

doi:10.1007/s10008-007-0361-x

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…This means that for high sweep rates, at the peak potential, the film parameters seem to be independent of the growing conditions in the same way as found by D 'Alkaine, et al, (2004) in the case of pure zinc. This is an indication of the presence of some kind of reproducible state which occurs for all passivation films studied until now when the film is grown over distinct metals at high sweep rates, (D'Alkaine & Santanna, 1998), (D'Alkaine, et al, 2004), (D'Alkaine, et al, 2007, (Motta, 2000), (Motta, 2005). The anodic voltammetries of hot-dip galvanized steel sheets samples with Pb in the coating are shown in Figure 7.…”

Section: Hot-dip Galvanized Steel Sheets Produced With Sb In the Bathmentioning

confidence: 84%

“…For this purpose, between voltammetry and voltammetry, the grown oxide film on the previous voltammetry was reduced at a constant cathodic potential (treatment potential) equal to -1.4 V during 8 min. This was done to ensure not only the reduction of the film stuck on the surface, but also the reduction of the disrupt film adhered to it by surface tension forces (D'Alkaine, et al, 2007). At the end of this time treatment the cathodic current always stabilized at about -0.076 mA cm -2 .…”

Section: Methodsmentioning

confidence: 99%

“…This generates the injection of recombining point defects and, consequently, the decrease of the ionic resistivity (inversely proportional to the concentration of point defects). On the order hand, the growth of the concentration of recombining point defects (interstitials cations and cationic vacancies) in the film lead to the recombination reaction (interstitial cation + cationic vacancies → lattice) originating, subsequently, the growth of the ionic resistivity, generating the minimum (D'Alkaine & Santanna, 1998), (D'Alkaine, et al, 2004), (D'Alkaine, et al, 2007, (Boscheto, 2008), (D'Alkaine, et al, 1993. Source Authors.…”

Section: Hot-dip Galvanized Steel Sheets Produced With Pb In the Bathmentioning

confidence: 99%

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Applicability of the Ohmic Model for voltammetric growth of ZnO on galvanized steel sheets containing Sb or Pb

Costa

Nogueira²

2022

RSD

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The aim of this study was to verify the applicability of the Ohmic Model with variable ionic resistivity to the voltammetric zinc oxide growth on galvanized steel sheets, without chromate passivating film. Two kind of galvanized steel sheets were studied: one produced from a bath of molten zinc containing antimony and the other containing lead. The galvanized steel sheets produced from a bath containing Sb presented better performance against corrosion in comparison on with those produced from a bath containing Pb. The electrochemical experiments were performed in a buffer solution of pH 8.7 with of 0.3 mol L-1 H3BO3 plus 0.15 mol L-1 Na2B4O7. It was found that the passivating zinc oxide grown on the galvanized steel sheet containing Sb showed higher ionic resistivity than that of the galvanized sheet containing Pb. This can explain the corrosion results.

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Section: Hot-dip Galvanized Steel Sheets Produced With Sb In the Bathmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: Hot-dip Galvanized Steel Sheets Produced With Pb In the Bathmentioning

confidence: 99%

See 1 more Smart Citation

Applicability of the Ohmic Model for voltammetric growth of ZnO on galvanized steel sheets containing Sb or Pb

Costa

Nogueira²

2022

RSD

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“…Above 2.0 V (vs SEC), the transpassivation region begins, promoting the disruption of the passivating layers (PbO/PbO 2 ), releasing Pb 2+ ions into the solution (R 4 ), accelerating the process of O 2 evolution in the positive plates (R 5 ). 20 , mentions that the evolution of O 2 is undesirable, as the increase in the pH of the electrolyte displaces the reaction sites for the formation of PbSO 4 during the discharge process, causing sulfation of the positive plates.…”

Section: Electrochemical Testsmentioning

confidence: 99%

Production and Characterization of Pb-Carbon Composite for Manufacturing Metal Grids Applied in Lead-Acid Batteries

Cossu,

Freitas,

Conceição

et al. 2024

Mat. Res.

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For decades, lead-acid batteries have been supplying power to electrical systems through redox reactions involving Pb and PbO 2 . However, the energy supply capacity is inherently constrained by low energy density and challenges associated with charge/discharge cycles. Studies have indicated that additions of C to the composition of the active mass improve the electrochemical properties of batteries. This work aims to produce, characterize the microstructure and evaluate the electrochemical properties of Pb-Carbon composites, comparing different types of C (graphite, graphene and xerogel). The samples were produced through powder metallurgy, pressed at 550 MPa and sintered at 320°C-48 h. The microstructure was characterized by XRD, SEM/EDS, and Vickers microhardness. Electrochemical analyses were evaluated through OCP, polarization, and cyclic voltammetry (CV) measurements in a solution of 4.91 mol•L -1 of H 2 SO 4 . Microstructural characterizations revealed dispersions of C particles in the Pb matrix and an increase in the microhardness of the composites. Electrochemical analyses showed an increase in polarization resistance and a reduction in the corrosion rate compared to Pb. CV curves, demonstrated that C particles enhanced electrical conductivity for the formation of PbSO 4 and PbO 2 , allowing greater absorption of electrical overpotentials when compared to Pb, thereby improving charge/discharge cycles in positive grids.

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“…In that occasion the organizers asked me to make a reflection about innovations in electrochemistry, especially in the corrosion field, one of my areas of research and development [1][2][3][4][5][6], where at the same time, I solve problems under contract for any kind of industry in all Brazil. They are these two aspects of my corrosion activity (the research and the solution of problems), together with my research in the field of Management of Technology in Latin-American conditions [7][8][9], that leaned me to accept the invitation, considering that, perhaps, I have something to contribute, due a to my relation with the productive sector in all the areas of the electrochemistry.…”

Section: General Introductionmentioning

confidence: 99%

Corrosion: technical problems, professional resources, working organization and RDAndamp;I characteristics for the Brazilian Productive Sector.

́Alkaine¹

2014

Proceedings of the 1st International Seminar on Industrial Innovation in Electrochemistry

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In the introduction, they are explained the reasons for this text and it is made an analysis of the situation of the corrosion field inside the industrial processes, especially in relation to its structural differences with other areas. It is analyzed why the field of corrosion is not, in general, an important component of the industrial corporative knowledge. The consequences of this fact are deduced in relation to corrosion and corrosion with innovation. In section 3, after to give the general scientific and technical bases of corrosion, the multidisciplinary characteristics of corrosion are justified and some of the most important characteristic of corrosion in Brazil together with their necessities are described. In section 4 they are analyzed the Brazilian corrosion market characteristics, specially the two 2 ARTICLE ND

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Disruption processes in films grown and reduced electrochemically on metals

Cited by 6 publications

References 7 publications

Applicability of the Ohmic Model for voltammetric growth of ZnO on galvanized steel sheets containing Sb or Pb

Applicability of the Ohmic Model for voltammetric growth of ZnO on galvanized steel sheets containing Sb or Pb

Production and Characterization of Pb-Carbon Composite for Manufacturing Metal Grids Applied in Lead-Acid Batteries

Corrosion: technical problems, professional resources, working organization and RDAndamp;I characteristics for the Brazilian Productive Sector.

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