A liga Alumínio AA5083 é bastante utilizada na fabricação de tanques rodoviários, de armazenamento de produtos químicos, silos para estocagem de grãos e tem grandes aplicações marítimas. Sabe-se que a resistência à corrosão de ligas com mais de 3% de magnésio é bastante afetada quando exposta a temperaturas elevadas por tempo prolongado. Portanto este trabalho visa fazer um estudo do efeito do pré-aquecimento da liga de alumínio na resistência a corrosão salina. Foi utilizado para este fim os ensaios: ensaio de imersão, câmara salina e por fim pelo método potenciodinâmico, sendo a caracterização das amostras realizadas antes e depois dos ensaios corrosivos por meio de microscopia eletrônica, metalografia, microdureza, e medidas de massa.
The AA508 aluminum alloy is widely used in the manufacture of road tanks, chemical storage, silos for grain storage and large marine applications. It is known that the corrosion resistance of alloys with more than 3% of magnesium is very high when exposed to higher temperatures for a long time. Corrosion monitoring consists in using techniques that allows to evaluate the corrosion process that can affect the integrity of material and also to provide corrective measures that ensure a long life of equipment and facilities. So, the purpose of this work is to study the effect of heating the AA5083aluminum alloy on corrosion resistance in saline medium. For this purpose, the following methods are performed: potenciodinamic, immersion and saline chamber. After these, the samples were characterized by macroscopic and microscopic analyses, Vickers microhardness and mass loss measurements. The results evidenced that the heating of studied alloy decreased its corrosion resistance in saline environment and showed pitting and intergranular corrosion, more accentuated.
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