Corrosion of Ni-Ti alloys in the molten (Li, K)_2CO_3 eutectic mixture

摘要

The corrosion of pure Ni and of binary Ni-Ti alloys containing 5, 10, and 15 wt./100 Ti respectively in molten (0.62Li, 0.38K)_2CO_3 at 650 deg. C under air has been studied. The corrosion of the single-phase Ni-5Ti alloy was slower than that of pure Ni, forming an external scale composed of NiO and TiO_2. The two-phase Ni-10Ti and Ni-15Ti alloys underwent much faster corrosion than pure Ni, producing an external scale containing NiO and TiO_2, and a thick internal oxidation zone of titanium mainly involving the intermetallic compound TiNi_3 in the original alloys.