Cathodic System
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Mechanical behavior of PVD coatings deposited on ADI
ABSTRACT In this work, the mechanical behavior of the coated ADI system is studied. For this purpose, single layer Ti and bilayer Ti/TiN and TiAl/TiAlN coatings, with different thicknesses, were deposited by the PVD technique of cathodic arc deposition on high strength ADI substrates using industrial and experimental devices. The characterization of the coat
Matéria (Rio J.). Publicado em: 25/11/2019
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2. Thick CrN/NbN Multilayer Coating Deposited by Cathodic Arc Technique
The production of tribological nanoscale multilayer CrN/NbN coatings up to 6 µm thick by Sputtering/HIPIMS has been reported in literature. However, high demanding applications, such as internal combustion engine parts, need thicker coatings (>30 µm). The production of such parts by sputtering would be economically restrictive due to low deposition rates.
Mat. Res.. Publicado em: 19/12/2016
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3. AC Induced Corrosion of Underground Steel Pipelines. Faradaic Rectification under Cathodic Protection: II. Theoretical Approach with Electrolyte Resistance and Double Layer Capacitance for Bi-Tafelian Corrosion Mechanism
AC corrosion enhancement of buried steel pipe is induced by high stray AC electromagnetic field and to the faradaic rectification due to non-linearity of current-potential characteristics. In Part I, this phenomenon was evaluated by neglecting the electrical resistance of soil electrolyte. In this part, we will examine when this resistance is no longer negli
J. Braz. Chem. Soc.. Publicado em: 2016-03
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4. Optimisation of an asymmetric polymerase chain reaction assay for the amplification of single-stranded DNA from Wuchereria bancrofti for electrochemical detection
Single-stranded DNA (ssDNA) is a prerequisite for electrochemical sensor-based detection of parasite DNA and other diagnostic applications. To achieve this detection, an asymmetric polymerase chain reaction method was optimised. This method facilitates amplification of ssDNA from the human lymphatic filarial parasite Wuchereria bancrofti. This procedure prod
Mem. Inst. Oswaldo Cruz. Publicado em: 2013-09
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5. Effect of cage configuration in structural and optical properties of tin films grown by cathodic cage discharge
Cathodic cage discharge was developed recently in order to eliminate phenomena as edge effect and overheating, which occurs during conventional processes. In this study, the effect of cage configuration in active species during the deposition process and optical properties of TiN film were studied. TiN compound was chosen because its optical properties are v
Mat. Res.. Publicado em: 10/05/2013
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6. Estudo da corrosão localizada da liga de alumínio 7475-T761 por espectroscopia de impedância eletroquímica global e local em meio de sulfato de sódio. / Localized corrosion study of aluminum alloy 7475-T761 in sulfate medium using global and local electrochemical impedance spectroscopy.
Aluminum alloys used in the aerospace industry with structural purpose exhibit a complex microstructure due to thermal and mechanical treatments they are submitted for improving their strength. The microstructure of these alloys is characterized by the presence of a great number of intermetallic (IM) particles, the electrochemical activity of which is differ
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/07/2011
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7. Desenvolvimento de procedimentos eletroanalíticos para a determinação de antioxidantes e corantes em produtos alimentícios empregando um eletrodo de diamante dopado com boro / Development of electroanalytical procedures for the determination of antioxidants and colorants in food samples using a boron-doped diamond electrode
The following topics were investigated in this thesis: a) the electrochemical response of a boron-doped diamond electrode, after different electrochemical pretreatments, for two antioxidants (butylated hydroxyanisole BHA and butylated hydroxytoluene BHT) and three food colorants (tartrazine TT, sunset yellow SY, and brilliant blue BB); b) the development of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/04/2011
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8. Eletrocatálise utilizando líquidos iônicos e consumo químico de óxidos / Electrocatalysis using ionic liquids and chemical comsumption of platinum oxides
This dissertation is divided on two parts. The first one deals with fundamental electrochemistry employing an ionic liquid as supporting electrolyte and as a subject of study by itself. Phenomena like the anodic and cathodic stability of the liquid, emphasizing its degradation mechanism is presented. It is also shown a study of the electrocatalytic oxidation
Publicado em: 2009
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9. Novos materiais para aplicações analíticas nas determinações de compostos orgânicos de interesse farmacêutico e ambiental / New materials for analytical application in organic compound determination for pharmaceutical and environmental interests
Carbon film sensors, built from resistors of 2 Ω nominal resistance, were employed for application in the environment and pharmaceutical fields without previous modification of the electrode surface. When these sensors are electrochemically treated they obtain a wider potential window (both anodic and cathodic regions) than many other forms of carbon. D
Publicado em: 2009
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10. Study of behavior of copper in systhetic rainwater of São Paulo and Rio de Janeiro and its protection against corrosion by coating and patino exposed to climate action. / Estudo do comportamento de cobre em águas de chuva sintéticas de São Paulo e Rio de Janeiro e sua proteção contra corrosão por revestimentos e pátinas expostos à ação climática.
Copper is one of the metals most widely used to produce metallic artifacts of the artistic and cultural heritage. This is partially due to its great ability to combine with other compounds, forming patinas of different colors. Many of such artifacts are permanently exposed to open air, being thus subjected to the action of atmospheric agents such as rain and
Publicado em: 2009
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11. Reavaliação da eficiência de óleo de coco saponificado e de sua microemulsão como inibidores de corrosão em uma célula eletroquímica
An interesting development in surfactants science and technology is their application as corrosion inhibitors, since they act as protective films over anodic and cathodic surfaces. This work aims to investigate the efficiency of saponified coconut oil (SCO) as corrosion inhibitor and of microemulsified system (SCO + butanol + kerosene oil + distilled water),
Publicado em: 2008
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12. Estudo do comportamento de corrosão dos intermetálicos presentes na liga AA 2024-T3, por meio de técnicas de microscopia associada a técnicas eletroquímicas / INVESTIGATION ON THE CORROSION BEHAVIOUR OF THE INTERMETALLICS IN THE AA 2024-T3 ALLOY BY MICROSCOPY ASSOCIATED TO ELECTROCHEMICAL TECHNIQUES.
The AA2024-T3 aluminium alloy is largely used in the aerospace industry. It has high mechanical properties due to the presence of alloying elements, mainly copper, that form finely distributed precipitates coherent with the matrix, during controlled aging treatment. However, during this process, large intermetallics (IMs) are also formed with composition and
Publicado em: 2008