Corrosion behavior of Ti_3AlC_2 in NaOH and H_2SO_4

摘要

Passivation behavior, corrosion kinetics and film formation mechanism of Ti_3AlC_2 in 1M NaOH and 1M H_2SO_4 solutions were investigated by linear potential scan, electrochemical impedance spectroscopy, cyclic voltammetry, SEM and XPS. The corrosion resistance mainly depended on the formation of passivating films on Ti_3AlC_2 in 1M NaOH and 1M H_2SO_4, which led to different corrosion processes. Ti_3AlC_2 displayed good corrosion resistance in NaOH due to the formation of dense and protective Ti oxides as the passivating film. However, it exhibited poor corrosion resistance in H_2SO_4 which attributed to the formation of permeable Ti sub-oxides as the pseudo-passivating film.