Corrosion Testing
Mostrando 25-36 de 38 artigos, teses e dissertações.
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25. Efeito do hidrogênio e mecanismos na pós-oxidação por plasma pulsado de ligas ferrosas nitretadas
O presente trabalho apresenta um estudo do efeito do hidrogênio, a influência da temperatura e do tempo no processo de pós-oxidação por plasma pulsado na liga ferrosa AISI 1045 previamente nitretada a plasma. O estudo das fases cristalinas presentes no sistema foi realizado pela técnica de difração de raios X (DRX). O método de refinamento por Rietv
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/08/2010
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26. Desenvolvimento de um dispositivo para ensaio de corrosão sob tensão : aplicação para ferro fundido cinzento imerso em biodiesel B100 de soja / Development of a device for testing stress corrosion : application to gray iron on exposure to soy biodiesel B100
Neste trabalho propôs-se o projeto de um dispositivo apropriado para ensaio de corrosão sob tensão do tipo tração com deformação constante, que seja eficiente, simples e de baixo custo. A utilização deste equipamento em ensaios de corrosão sob tensão permite avaliar as propriedades de resistência dos materiais ensaiados com relação à tensão e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/07/2010
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27. Contribution to the development of performance specifications for concretes containing blast furnace slag / Contribuição ao desenvolvimento de especificações por desempenho para concretos com escoria de alto-forno
In 2008 alone, the annual steel production in Brazil was around 31 million tons. The steel production process generates an average of 500 kg of residues and co-products per ton of steel. From this total, 70% corresponds to the slags. Although investigating the increase of blast furnace slag use is of extreme importance for the concrete and steel industries s
Publicado em: 2010
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28. Characteristics of austenitic stainless steel nitrided in a hybrid glow discharge plasma
A nitriding process based on two distinct nitrogen glow discharge modes, with sample temperatures ranging from 380 0C to 480 0C, was employed to treat the surface of austenitic stainless steel (SS 304). The temperature is controlled exclusively by switching the operation conditions of the discharges. First mode of operation is the conventional one, named cat
Brazilian Journal of Physics. Publicado em: 2009-09
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29. Environmentally induced cracking of API grade steel in near-neutral pH soil
Environmentally induced cracking of pipeline steels in contact with soil have been investigated. Different soils were prepared in order to determine their physical, chemical and bacteriological characteristics. Slow strain rate testing was carried out by using electrolytes obtained from soil samples and NS4 standard solution. Stress vs. strain curves of API
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-06
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30. 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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31. Estudo da deterioração de marquises de concreto armado nas cidades de Uberlândia e Bambuí / Study if Deterioration of Constructed Concrete Skyways in the city of Uberlândia and Bambuí
In recent years the number of the constructed concrete marquees with pathological manifestations has grow in Brazil, and consequences have caused them to be structurally weak, which has generally lead to fatalities. As preventive action, it becomes necessary that the projects and construction thereof be improved in quality, that found pathological causes be
Publicado em: 2009
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32. Mechanical properties and corrosion resistance of the Ti-35Nb alloys applied as biomaterial / Propriedades mecanicas e de resistencia a corrosão de ligas Ti-35Nb a serem aplicadas como biomaterial
Titanium alloys form the most versatile class of metallic materials used as biomaterials. Among them, one finds the ß ?type alloy, which must soon become the standard metallic materials for orthopedic applications. The aim of this work is to prepare and characterize a type ß ?titanium alloy containing 35 wt.% Nb. Samples of such alloy were rapidly and slow
Publicado em: 2008
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33. STRUCTURAL ASSESSMENT OF PIPELINES WITH BLUNT CORROSION DEFECTS COINCIDENT WITH LONG-SEAM WELDS / AVALIAÇÃO ESTRUTURAL DE DUTOS COM DEFEITOS DE CORROSÃO COINCIDENTES COM A SOLDA LONGITUDINAL
One of the most important issues that affects pipeline integrity is corrosion-caused metal loss. This type of defect can occur over the pipe body, seam or girth welds or even on heat affected zones. Pipeline remaining strength criterions are restricted or even prohibited for assessing corrosion defects coincident with weld regions. This present work investig
Publicado em: 2007
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34. Avaliação experimental e modelagem dos efeitos estruturais da propagação da corrosão em elementos de concreto armado
O concreto armado era tido, quando da sua concepção inicial, como um material que teria boa durabilidade e uma vida útil elevada, praticamente dispensando reparos. Com a intensificação de seu uso, todavia, começaram a serem observados diversos processos de deterioração que resultaram, nos casos mais críticos, em severos comprometimentos de desempenh
Publicado em: 2007
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35. The effect of alloying on the resistance of carbon steel for oilfield applications to CO2 corrosion
A systematic study has been conducted to investigate the influence of a wide range of alloying elements and different processing conditions on the resistance of low-carbon steels to CO2 corrosion. Strong carbide-forming microalloying elements such as Ti, Nb and V, along with Cr additions, and different levels of Mn, Si, Cu, Mo and Ni, have been explored, alo
Materials Research. Publicado em: 2005-12
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36. EVALUATION OF API STEEL WELDED JOINTS IN A CORROSIVE MEDIUM / AVALIAÇÃO DA JUNTA SOLDADA DE AÇO API EM MEIO CORROSIVO
The steel tubes used in the Oil Industry are constantly exposed to hydrogen sulphide (H2S) which leads to the diffusion of hydrogen into the steel, provoking hydrogen induced embrittlement cracks and/or stress corrosion cracking. Welded joints, generally considered to be the critical region in pipelines, were evaluated in this study, using slow strain rate t
Publicado em: 2005