Estudo da resistência à corrosão das ligas não ferrosas: alumínio 6061 e cobre eletrolítico em contato com biodiesel de canola

• Autor(a) principal: Tavares, Tamara da Silva
• Data de Publicação: 2023
• Outros Autores: [e-mail]
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/21047
• topic: Biodiesel; Corrosion; Non-ferrous alloys; Materials Science and Technology; Biodiesel; Corrosão; Ligas não ferrosas; Ciência e Tecnologia de Materiais; ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::MATERIAIS NAO METALICOS

The growing worldwide interest in the production and use of biodiesel as a substitute for petroleum diesel seems to indicate a path towards a progressive substitution of petroleum as a fuel. The corrosivity of biodiesel is directly linked to it’s original raw material, that is, the characteristics of vegetable oils such as oxidation and moisture absorption, in addition to the attack of microorganisms during storage. Differences in chemical composition, mainly in relation to the degree of unsaturation, lead to degradation processes and the formation of products with different degrees of corrosivity. The presence of metallic ions in biodiesel, caused by corrosion, catalyzes oxidation reactions, leading to instability and accelerated degradation of biodiesel. This work aims to evaluate the corrosion resistance of electrolytic copper C110 and cluminum alloy 6061 immersed in canola biodiesel. Biodiesel was initially characterized according to the quality specifications of pure biodiesel (B100), obtained from canola oil, established by the ANP. The corrosion of the alloys was determined by means of mass loss measurements and calculation of the corrosion rate of the samples as a function of the immersion time in biodiesel (7, 30, 60 and 90 days), as well as the micrograph of the samples in an optical microscope metallographic. Biodiesel was characterized by acid number measurements and UV/Vis absorption spectroscopy in order to measure its degradation after different sample immersion times. With the aim of evaluating the influence of temperature on the corrosion process, an immersion test of the samples in biodiesel (7 days) at room temperature and at a temperature of 60°C was carried out. The results revealed that the electrolytic copper alloy has a high corrosivity index in contact with biodiesel, compared to aluminum alloy 6061. The copper alloy samples showed high corrosion rates, biodiesel with increased acidity and degradation with over time, in addition to the micrographs showing generalized and pitting corrosion of the samples. Tests carried out at a temperature of 60°C showed an increase in corrosion for samples of both alloys in relation to samples immersed in biodiesel at room temperature.