Artículos, informes y presentaciones en Congresos
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Examinando Artículos, informes y presentaciones en Congresos por Autor "Bengoa, Leandro N."
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Acceso Abierto Corrosion of conductor rolls in the electrogalvanizing line at Terniun(2013) Egli, Walter Alfredo; Sere, Pablo Ricardo; Bengoa, Leandro N.; Versino, Florencia; Bruno, Sonia; Lazzarino, Andrés; Espósito, FernandoConductor rolls in the electrogalvanizing line are made of Duplex Stainless Steel (DSS) and after some time in service they suffer surface deterioration leading to surface defects and rejections in high quality products. Repassivation kinetics and susceptibility to pitting corrosion for the austenitic and ferritic phases were studied. An electrochemical treatment that reproduces the actual industrial corrosive situation was applied to test different alloys in the laboratory. The Hastelloy C22 showed the best performance and was evaluated in the line during a complete production batch. The new roll presented a slight deterioration, much lower than the DSS rolls. - Documento de conferencia
Acceso Abierto Desarrollo de electrolito de cobreado en medio alcalino libre de cianuro(2017) Pary, Paola; Bengoa, Leandro N.; Baliño, Julieta; Sere, Pablo Ricardo; Egli, Walter AlfredoDesde ya hace muchos años en la industria de la galvanoplastia se utilizan los electrolitos basados en cianuro para obtener recubrimientos de cobre. Estos electrolitos son altamente tóxicos y se están haciendo numerosas investigaciones con el fin de obtener alternativas para su reemplazo. El objetivo del presente trabajo es estudiar el sistema de Cu+2-glutamato como reemplazo del cianuro y evaluar su idoneidad para la obtención de recubrimientos de cobre alcalino moderado (pH8) sobre sustratos de acero y de Zamak con fines industriales y decorativos. Para ello se realizaron experiencias de cobreado en las distintas geometría de celdas utilizadas en la industria a escala de laboratorio (celdas de cátodo plano con agitador magnético, celdas de cátodo oscilante y celdas de barril rotativo. Los depósitos obtenidos fueron caracterizados por diferentes técnicas. Se obtuvieron recubrimientos de cobre homogéneos, de aspecto brillante y de adecuada adherencia sobre los diferentes sustratos y en las distintas geometrías de celdas utilizadas. - Artículo
Acceso Abierto Ultrasound Assisted Electrodeposition of Cu-SiO2 Composite Coatings: Effect of Particle Surface Chemistry(2019) Bengoa, Leandro N.; Ispas, A.; Bengoa, José Fernando; Bund, A.; Egli, Walter AlfredoElectrodeposition of Cu-SiO2 composite coatings from an alkaline non-cyanide electrolyte containing glutamate as complexing agent was studied. Silica mesoporous particles were synthesized using a modified Stöber methodology, and later their surface chemistry was changed by functionalizing them with 3-aminopropyltriethoxysilane. Particles microstructure and morphology were characterized (SEM, TEM, XRD) and their charging behavior in several electrolytes was studied through ζ -potential measurements. Galvanostatic deposition was performed in electrolytes containing both as-prepared and functionalized SiO2 at various current densities, and the influence of ultrasonic irradiation (37 Hz) was evaluated. For some experiments, 1.5 g L− of Polyquaternium 7 were added to the solution. SEM and XRD were used to characterized coatings morphology and microstructure, whereas EDS was used to estimate SiO2 wt%. The results showed that the effect of ultrasound on the codeposition process depends on current density and particle surface chemistry. All the trends observed in this study could be explained taking into account ζ -potential values recorded and previously reported theories. Adjusting the experimental conditions, it was possible to obtain deposits with SiO2 contents of ≈5 wt%. Finally, it was found that both ultrasonic irradiation and Polyquaternium 7 affect the morphology and crystal orientation of the deposits.