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Northeastern Brazilian Marine Atmospheric Corrosion Performances of Galvanized Steel and Copper Specimens

Journal of Chemistry and Chemical Engineering 2011年第5期5卷 435-442页

作者： Kelly Jacqueline Campos Brambilla Princia Aparecida Morais Pereira Kleber Franke Portella Paulo CosarInone Fernando Piazza Jose Maurilio da Silva Guilherme Cunha da Silva Sergio Luiz Henke Mairio Seixas Cabussu Dailton Pedreira Cerqueira rogerio nascimento salles Instituto de Tecnologia para o Desenvolvimento Departamento de Materiais Curitiba Parandz PoBox： 19067 81531-980 Brazil Companhia de Eletricidade da Bahia COELBA Departamento de Engenharia de Manuten96o Granjas Rura~ Pres. Vargas s/nSalvador BA 41.290-000 Brazil

Copper, in turn, is the most useful material in the field of electricity, especially in electrical contacts. Already, the zinc is the most useful metal in atmospheric exposure conditions which is used in sheet form as castings, but whose most important application is as a coating for corrosion protection of steel structures. Salvador, it has disadvantages as an environment conducive to corrosion, by setting up a wet surface time t4, high corrosive environment （C4）. This work was proposed to study the performance of these metals compared to the effects of air pollution of an industrial site. For both atmospheric corrosion sites （ACS） were implanted natural weathering standard in order to assess the aggressiveness of atmospheric contaminants on the performance of metal specimens （galvanized steel and copper）. In determining their corrosion rates which were analyzed for sulfate and chloride ions, atmospheric, given the proximity of this ACS to the seafront, due to these propitiate the acceleration of corrosion. The results allowed observation that the average local concentration of the sulfate was higher than the chloride, because of the proximity of the pollutant source, and that the corrosion rate of galvanized steel was more significant than 61.5% of copper.

关键词： Atmospheric corrosion copper galvanized steel performance.

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A Model for the Characterization and Selection of Beeswaxes for Use as Base Substitute Tissue in Photon Teletherapy

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Materials Sciences and Applications 2012年第4期3卷 218-223页

作者： rogerio Matias Vidal Divanizia do nascimento Souza Department of Physics University of SergipeSao CristovaoBrazil

This paper presents a model for the characterization and selection of beeswaxes for use as base substitute tissue for the manufacture of objects suitable for external radiotherapy using megavoltage photon beams. The model of characterization was divided into three distinct stages: 1) verification of aspects related to the origin of the beeswax, the bee species, the flora in the vicinity of the beehives and procedures to detect adulterations;2) evaluation of physical and chemical properties;and 3) evaluation of beam attenuation capacity. The chemical composition of the beeswax evaluated in this study was similar to other simulators commonly used in radiotherapy. The behavior of the mass attenuation coefficient in the radiotherapy energy range was comparable to other simulators. The proposed model is efficient and enables convenient assessment of the use of any particular beeswax as a base substitute tissue for radiotherapy.

关键词： Beeswaxes Characterization Model Radiotherapy

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