Intergranular Corrosion
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. The influence of Cu content on high temperature corrosion behavior of heat - resistant molten salt steel
ABSTRACT This work studies the high temperature corrosion behavior of new heat-resistant steel with salt coating method of 75%Na2SO4+25%NaCl coating on the steel surface at 700ºC. The chemical composition of corrosion products and surface morphology of the corrosion layer were analyzed using X-ray diffractometer (XRD), scanning electron microscopy (SEM), en
Matéria (Rio J.). Publicado em: 16/09/2019
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2. The Effects of pH Values on Functional Mechanisms of Nitrite Anions for Q235 Carbon Steels in 0.01 mol L-1 NaNO2-HCl Solutions
For Q235 carbon steels in 0.01 mol L-1 NaNO2-HCl solutions with different pH values, the effects of pH values on the functional mechanisms of nitrite anions (NO2-) were studied. In the pH 1 and pH 2 solutions, the Q235 steels showed the electrochemical behavior of activation, and uniform corrosion (UC) was the main corrosion type on the Q235 surface. The pre
J. Braz. Chem. Soc.. Publicado em: 12/08/2019
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3. Influência da adição de Sn na resistência à corrosão e na capacidade de recarga da liga Pb-1,5%Sn para grade positiva de baterias chumbo-ácido
RESUMO O presente trabalho teve como objetivo avaliar o processo de corrosão do Pb e da liga Pb-1,5%Sn quando submetidos à condição de ciclagem em meio de ácido sulfúrico, visando compreender a influência da adição de Sn na resistência à corrosão e na capacidade de recarga para grades positivas de baterias do Pb-ácido. As amostras de estudo fora
Matéria (Rio J.). Publicado em: 20/05/2019
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4. Avaliação da Adição de Ti, Nb e (Ti+Nb) na Microestrutura e Susceptibilidade à Sensitização de Aços Inoxidáveis Ferríticos Submetidos à Soldagem TIG
Resumo Neste estudo, a microestrutura e a resistência à corrosão intergranular de aços inoxidáveis ferríticos com adições de Nb, Ti e (Ti+Nb) submetidos à soldagem TIG foram investigadas. A caracterização estrutural dos cordões de solda foi realizada através de microscopias óptica (MO) e eletrônica de varredura (MEV) e espectroscopia por energ
Soldag. insp.. Publicado em: 16/05/2019
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5. Investigation of Stress Corrosion Cracking of Austenitic, Duplex and Super Duplex Stainless Steels under Drop Evaporation Test using Synthetic Seawater
Abstract Stress corrosion cracking (SCC) of UNS S31603 austenitic stainless steel (ASS), UNS S32205 duplex stainless steel (DSS) and UNS S32750 super duplex stainless steel (SDSS) was investigated. SCC tests were carried out at 110 ºC for 500 h under drops of synthetic seawater (DET, drop evaporation test). Two loading conditions were investigated: 50 % and
Mat. Res.. Publicado em: 31/01/2019
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6. Efecto del tratamiento térmico sobre la resistencia mecánica, corrosión intergranular y exfoliación de la aleación de aluminio 7075
ABSTRACT In this study, the effects of heat treatments in the peak aged (T6), overaged (T73) and retrogression and reaging (RRA, retrogression at 200 °C for 10 min) on the microstructure, mechanical strength, exfoliation corrosion and intergranular corrosion of aluminum alloy 7075, has been investigated by optical microscope, scanning electron microscopy, t
Matéria (Rio J.). Publicado em: 19/07/2018
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7. Comportamiento frente a la corrosión de uniones soldadas por fricción agitación de AA7075-T651: Evaluación galvánica
ABSTRACT Friction Stir Welding (FSW) is a novel solid-phase welding process, which has proved to have a great potential for the realization of welded joints in materials with poor weldability such as heat-treatable aluminum alloys. The aerospace industry has incorporated this process for the manufacture of structural elements, using known high strength alloy
Matéria (Rio J.). Publicado em: 19/07/2018
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8. Influence of heat treatments on the microstructure and degree of sensitization of base metal and weld of AISI 430 stainless steel
ABSTRACT AISI 430 is a non-stabilized ferritic stainless steel grade with carbon content lower than 0.12%.After hot and cold rolling this material is annealed. The slow cooling after soaking at temperatures between 900oC and 1000oC promotes the formation of a high quantity of carbides and nitrides, while the rapid cooling partially suppresses the formation o
Matéria (Rio J.). Publicado em: 08/01/2018
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9. The Evolution of the Niobium Production in Brazil
Niobium (Nb) was initially applied in the industry in 1933 to stabilize stainless steels against intergranular corrosion. Around 1970, niobium started to be used in many technological applications, especially in heat treatments at high temperatures, in the form of superalloys and, over the past four decades, Nb has been employed on an industrial scale. Durin
Mat. Res.. Publicado em: 2015-02
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10. Investigation of the nugget zone corrosion behavior in friction stir welded lap joints of 6061-T6 aluminum alloy
The corrosion behavior at different positions (top and bottom) of the weld nugget zone along the thickness plates in AA6061-T6 aluminum alloys welded by friction stir lap welding, under the conditions of 1000 rpm-60 mm/min and 900 rpm-40 mm/min in a 3.5 wt% NaCl solution, was investigated by Tafel polarization at ambient temperature. The morphology of the nu
Mat. Res.. Publicado em: 2014-12
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11. Corrosion behavior of friction stir welded lap joints of AA6061-T6 aluminum alloy
In this work, the corrosion behaviors of friction-stir lap welding of 6061-T6 Al-alloy are studied. The friction-stir lap welding was performed under different welding conditions (rotation speed and welding speed). The corrosion behavior of the parent alloy, the weld nugget zone (WNZ), and the heat affected zone (HAZ) of each welded sample working as an elec
Mat. Res.. Publicado em: 09/05/2014
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12. Effect of grain size changes on corrosion behavior of copper produced by accumulative roll bonding process
The effect of changes in grain size on corrosion resistance of the pure tough pitch copper stripwas investigated in acidic and alkaline NaCl solutions. Accumulative roll bonding as sever plastic process was applied up to 8 cycles to produce the ultrafine graincopper. Polarization and electrochemical impedance tests were used for corrosion resistance investig
Mat. Res.. Publicado em: 20/08/2013