Efeito da microestrutura e temperatura na resistência à corrosão de aços inoxidáveis em fluido a base de iminodiacetato dissódico

Abstract

The corrosion of stainless steels in alkaline solutions containing organic complexing agents represents a challenge in various industrial applications. In this thesis, the effect of microstructure and temperature on the corrosion resistance of AISI 316L, 2205, and 430 stainless steels in a medium containing disodium iminodiacetate was evaluated. Electrochemical tests were carried out to investigate the stability of the passive film, complemented by microstructural analyses for phase identification and morphological changes. The results indicate that the duplex stainless steel 2205 exhibits superior behavior, with greater passive film stability even at temperatures of 80 °C and 100 °C. On the other hand, 316L and 430 showed higher susceptibility to localized corrosion and the formation of microcracks and porosity. This study deepens the understanding of the role of microstructure and temperature in corrosion mechanisms and provides relevant information for material selection and mitigation of corrosion in alkaline media.