Per: tayná raizza ribeiro (Engenharia Metalúrgica, Graduada, Departamento de Engenharia Metalúrgica, UEMG, João Monlevade, MG, Brasil.), Samya Estevam Ribeiro (ENGENHARIA METALÚRGICA, GRADUADA, DEPARTAMENTO DE ENGENHARIA METALÚRGICA, UEMG, JOÃO MONLEVADE, MG, BRASIL.), Athos Fernandes Araujo (Engenharia Metalúrgica, Mestrando, Departamento de Engenharia Metalúrgica e Materiais, UFMG, Belo Horizonte, MG, Brasil), Gustavo Henrique Sousa (Engenharia Metalúrgica, Mestre, Departamento de Engenharia Metalúrgica e Materiais, UFMG, Belo Horizonte, MG, Brasil ), Rafael Ferreira Delfim Bueno (Engenheiro de Produto, Graduado, ArcelorMittal Monlevade, GETEP, João Monlevade, MG, Brasil), Ermani Vinicius de Oliveira Lima (Engenheiro de Produto, Mestre, ArcelorMittal Monlevade, GETEP, João Monlevade, MG, Brasil.)
Abstract:
Corrosion is extremely harmful to the material, causing major damage. Once undetected, it can cause an abrupt rupture of a part, structure or pipe, causing serious accidents. In order to reduce these damages, materials with chemical composition and suitable microstructures were created to be more resistant to corrosion. This is the case of stainless steels, which have the characteristic of containing at least 10.5% of chromium in their composition. This type of steel has a better performance when compared to common steel when applied in more aggressive media, such as in the petrochemical industry where it is widely used. In order to attest its resistance and evaluate its behavior in the presence of acid solutions, this work was developed using the duplex stainless steel UNS32304 which was subjected to two types of acid solutions, sulfuric and hydrochloric acid, in different concentrations. The immersion test lasted 60 days and had pH and potential difference measured weekly. Through the data obtained, it was possible to calculate the corrosion rate of stainless steel, evaluating its behavior and susceptibility to corrosion. It was concluded that the UNS32304 duplex stainless steel showed satisfactory results, with a rate below 5mpy in the different solutions, therefore, its use is recommended.
