Programa de Pós-Graduação em Engenharia Industrial - PPGEI/ITEC
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/10050
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Dissertação Acesso aberto (Open Access) Avaliação da influência das águas de poço e industrial tratada na corrosão do cobre(Universidade Federal do Pará, 2021-02-04) LIMA, Andel Denilson Matos; CARDOSO FILHO, José Carlos de Araújo; http://lattes.cnpq.br/7033790503322903Efficient corrosion monitoring prevents, in an industry, unplanned downtime for corrective maintenance to exchange parts, pipes, materials, components and equipment made of copper that have contact with raw or treated water and that suffer wear and tear over time. This work monitored through the exposure of well water and treated a cosmetics industry, located in the State of Pará, the level of corrosivity when in contact with corrosion coupons (proof bodies) made of copper. The method of analysis consisted of immersing these coupons in well water and industrial water for 7, 14, 21 and 28 days. In each period, the coupons were removed clean and taken to mass loss tests, corrosion rate, corrosion potential and polarization curves. In addition to physicalchemical and microbiological analyzes of water samples for the calculation of stability, which shows whether the trend is stable, corrosive or fouling. The results showed that well water has low corrosivity and industrial water has moderate corrosivity, even receiving chemical treatment for pH correction and microbiological control. The loss of mass and the corrosion rate of the copper coupon were greater for industrial water and the polarization curves and corrosion potential showed that industrial water has a high degree of corrosion compared to well water.Dissertação Acesso aberto (Open Access) Avaliação da resistência elétrica e mecânica da liga de alumínio série 6101 modificada com 0,16%Nb(Universidade Federal do Pará, 2021-06-28) ALMEIDA, Denyson Teixeira; QUARESMA, José Maria do Vale; http://lattes.cnpq.br/7443111804471290The requirement for better materials for electrical cables has demanded the need of new, stronger and better conductivity aluminum metal composites. 6xxx series alloys, more specifically 6101 and 6201, have been combined with various chemical elements, heat treated and artificially aged to improve mechanical strength and conductivity. Brazil is the largest producer, exporter and holder of the worldwide niobium deposits. Thus, this metal has a high potential as a very promising alloying element for the target material of this study, when it combined with other metals, makes the material superconducting, has a medium grain refinement effect, an aggregating action to improvement of mechanical strength. In this study it will be proposed to add [0.16]%Nb to the Al-0,05%Cu-[0,24-0,28]%Fe-0,5%Si-0,6%Mg, casting in “U” metal shell evaluating the behavior of the heat resistance according to COPEL protocol (Companhia Paranaense de Energia Elétrica), mechanical, electrical resistance and microstructural characterization.