2003 Volume 52 Issue 2 Pages 92-101
Controlling the reduction of Fe3O4 film is an important factor to improve corrosion resistance of carbon steel for geological disposal of radioactive waste. In the present study, the effect of alloying elements on the reduction reaction of Fe3O4 film was examined using sputter-deposited complex oxide films and low alloy steels containing the alloying elements. Fe3O4 films containing a small amount of another oxides were cathodically polarized in the simulated solution of bentonite-contacting water. It showed that the addition of Cr2O3, TiO2, Al2O3 and MoO2 to Fe3O4 is effective on the suppression of the reductive reaction. Fe3O4 films formed on the steels containing small amount of Cr, Ti, Al and Mo by alkaline solution treatment at high temperature also showed a high resistance against the reductive dissolution. The steels containing these alloying elements showed excellent corrosion resistances in the simulated solution of bentonite-contacting water.
