White Corrosion
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Avaliação do chá branco como potencial inibidor de corrosão
RESUMO O trabalho apresenta avaliação do extrato alcoólico do chá branco como potencial inibidor de corrosão para o aço carbono P110 na presença de ácido clorídrico 1 mol.L-1. Os inibidores de corrosão destacam-se na proteção de peças metálicas em ambientes ácidos, sendo que muitas das substâncias presentes na composição de inibidores comer
Matéria (Rio J.). Publicado em: 20/05/2019
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2. Corrosion Behavior of Duplex and Lean Duplex Stainless Steels in Pulp Mill
The cyclic potentiodynamic polarization behavior of duplex stainless steel (DSS) and lean duplexstainless steel (LDSS) was studied in white and green liquors froma pulp processingplant. The corrosion behavior in industrial and also synthetic liquor was compared. The polarization curves of the duplex steels in synthetic white liquor were shifted to lower pote
Mat. Res.. Publicado em: 18/12/2017
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3. Rietveld and Impedance Analysis of Cold and Hot Rolled Duplex and Lean Duplex Steels for Application in Paper and Pulp Industry
In this study, X-Ray Diffraction (XRD) and Rietveld Refinement were performed to identify and quantify the ferrite and austenite phase of cold and hot rolled duplex stainless steels (UNS S31803) and lean duplex stainless steels (UNS S32304). Electrochemical impedance spectroscopy (EIS) was applied to evaluate the chemical behavior of duplex and lean duplex s
Mat. Res.. Publicado em: 10/11/2016
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4. Two-part silicone mold. A new tool for flexible ureteroscopy surgical training
ABSTRACT Introduction and objectives: Flexible ureteroscopy is a common procedure nowadays. Most of the training programs use virtual reality simulators. The aim of this study was to standardize the building of a three-dimensional silicone mold (cavity) of the collecting system, on the basis of polyester resin endocasts, which can be used in surgical traini
Int. braz j urol.. Publicado em: 2016-08
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5. Estudo do processo de cromatização de arames galvanizados e propostas de alternativas para retardamento da ocorrência prematura de oxidação branca
Este trabalho apresenta um estudo do processo de cromatização de arames galvanizados da Linha de Galvanização 2 da Gerdau Riograndense através do entendimento das variáveis de processo que podem ser alteradas com o intuito de proporcionar uma resistência à oxidação branca maior do que a fornecida com os parâmetros de processo utilizados atualmente
Publicado em: 2011
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6. A nanotecnologia aplicada à prevenção da corrosão : o uso de nanocerâmicos de alumina e zircônia
This work presents the study of a nanoceramic material, based on a matrix of Al2O3 with addition of ZrO2 15% in mol, as corrosion inhibitor in metallic substrates: steel carbon, steel galvanized minimized and aluminum. The characterization of the formed oxides was carried out by the study of Fourier´s Transformed Infrared Spectroscopy (FTIR) and Ray X diffr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/11/2008
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7. RESISTIVIDADE ELÉTRICA DE CONCRETOS DE CIMENTO PORTLAND BRANCO E ELEVADOS TEORES DE ESCÓRIA DE ALTO FORNO / ELECTRICAL RESISTIVITY OF WHITE PORTLAND CEMENT CONCRETES AND HIGH BLAST FURNACE SLAG CONTENT
The electrical resistivity is an important concrete property that allows evaluating the access facility of aggressive agents before the corrosion process begins and estimates the velocity of the same process after it begun. The electrical resistivity and the oxygen availability are the characteristics that control the corrosion velocity. This work aimed to e
Publicado em: 2008
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8. CARBONATION AND CAPILLARY ABSORPTION IN CONCRETES OF WHITE PORTLAND CEMENT WITH HIGH CONTENTS OF BLAST FURNACE SLAG AND CHEMICAL ACTIVATORS / CARBONATAÇÃO E ABSORÇÃO CAPILAR EM CONCRETOS DE CIMENTO PORTLAND BRANCO COM ALTOS TEORES DE ADIÇÃO DE ESCÓRIA DE ALTO FORNO E ATIVADOR QUÍMICO
The carbonation phenomenon, reaction between CO2 from the atmosphere in the presence of humidity with the Portland cement hydration products, induces pH reduction to levels that can cause the elimination of steels protective layer, enabling the corrosion mechanism of the steel structure to start.. This is one of the main pathologies in the reinforced concret
Publicado em: 2008
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9. Obtenção de filmes passivantes de molibdato de amonio e nitrato de cerio para ligas de zinco eletrodepositadas / The attainment of passivating films of ammonium molybdate and cerium nitrate for alloys of zinc electrodeposits
The electroplated zinc alloy coatings present better corrosion resistance than pure zinc, but they need a posterior passive treatment aiming the reduction of the formation of white corrosion products. Chromate conversion process is the process that, until now, presents the best results as passive treatment for zinc alloy coatings, although it presents high t
Publicado em: 2005