Influência da austenita revestida na resistência à corrosão, do aço maraging 350 em meio aquoso de 3,5% NACL

Abstract

Maraging steels are alloys with wide application in engineering and are steels that offer a unique combination of high mechanical strength and fracture toughness. Thus, its study is extremely important, so that the correct application of these materials in daily life is increasingly possible. The present work sought to study the influence of reversed austenite on the corrosion resistance of maraging steel 350 in an aqueous medium of 3.5% NaCl, under the conditions for different periods of thermal aging treatment (1 hour, 3 hours, 5 hours, 15 hours and 24 hours). In order to analyze the emergence of reversed austenite in the material, the samples were subjected to X-ray diffraction and to verify the effect of this phase on corrosion resistance, electrochemical polarization, electrochemical impedance and OCP tests were performed. The results indicate that the samples submitted to longer aging times presented more intense peaks of reversed austenite, and according to the results collected through the corrosion tests performed, they presented less resistance to corrosion.