Abstract
The corrosion behavior of sinterd Mo2FeB2 base hard alloys was studied in oxidizing and non-oxidizing acid solutions. The behavior of the alloys varies depending on its composition and corrosive environments. The addition of Ni increases the corrosion resistance in a non-oxidizing acid solution, whereas the addition of Cr increases the resistance in an oxidizing acid solution. Transition of the preferentially attacked phase of the alloy from a ferrous binder to a Mo2FeB2 complex boride occurs with increasing Cr content, associated with the active-passive transition of the ferrous binder in an oxidizing acid solution. The Mo2FeB2 base hard alloy has a good corrosion resistance through selection of a suitable composition for a given corrosive. The Mo2FeB2 base hard alloy has potential utilities as a corrosion-resistant material in various corrosive environments.
