Estudo da resistência à corrosão entre vergalhões com diferentes microestruturas frente aos íons cloretos

Abstract

The rebar are produced by hot rolling process. In the process studied here there are two distinct production routes. Prior to the hot rolling process, one route uses the reheat step through the furnace, and the other uses the semi-finished steel product directly from the solidification process. When establishing a comparison between the routes, the obtained microstructures show some differences. The objective of this work is to evaluate how the differences between the microstructures influence in the resistance to corrosion by chlorides. For this, anodic potentiodynamic polarization and electrochemical impedance spectroscopy tests were performed in NaCl solution, simulating the effects of Cl- ion present in the marine atmosphere. From the curves obtained in the electrochemical tests, it was possible to observe that the corrosion properties are similar for both process.