Caracterização da resistência à corrosão das ligas de titânio grau 23 e grau 29 através de ensaios de polarização potenciodinâmica cíclica e perda de massa

Abstract

This study aimed to compare the corrosion resistance between titanium alloys grade 23 and Ti-6Al-4V ELI (extra low interstitial), which has strict control over interstitial elements, and grade 29, which has the same composition as the previous alloy but with an addition of 0.11% (by weight) of ruthenium in its composition. For this purpose, samples of both materials were subjected to electrochemical tests of open circuit potential and cyclic potentiodynamic polarization, in order to evaluate electrochemical parameters that clarify the corrosion resistance of these alloys. Immersion tests were also conducted to determine the corrosion rates of the alloys in different non-oxidizing solutions. The results of the electrochemical tests did not reveal significant differences between titanium alloys grade 23 and grade 29. In the immersion tests, however, a considerable difference was observed when performed in HCl solution. Although the immersion test showed differences, the literature on the effect of ruthenium (Ru