This study investigated the electrochemical properties of the TiFeCoNi equimolar alloys under the as-cast and as-annealed states. The annealing temperature was fixed at 1000 ℃ and the annealing times were 2, 4, 6 and 24 hrs. These alloys were statically immersed in 1M H2SO4 solution for measuring their corrosion rates. The polarization curves of the alloys under different conditions were done. The corrosion potentials, critical currents and corrosion rates of these alloys were also analyzed and compared with commercial 304 stainless steel.
The corrosion occurred at the interdendritic regions of TiFeCoNi alloys during the electrochemical tests. Increasing the concentration of the solution of H2SO4 would result in increasing the passive current. Increasing the annealing time at 1000℃ would also result in increasing the passive potential. In addition, the passive currents and potentials of the as-cast and the as-annealed TiFeCoNi alloys are all better than that of commercial 304 stainless steel.
