The corrosion behavior of Ni3(Si,Ti) intermetallic compounds with Al, Cr, and Mo in various acidic solutions

Abstract The corrosion behavior of specimens consisting of two regions of a Ni 3 (Si,Ti) single-phase of L1 2 structure and two phases of L1 2 and fcc Ni was examined in 0.5 kmol/m 3 HCl, H 2 SO 4 and HNO 3 . Ni 3 (Si,Ti) with Cr showed the highest corrosion resistance. The single L1 2 phase region was preferentially dissolved for all specimens in all solutions. This fact was interpreted in terms of lower corrosion resistance of the region due to the presence of active Al or due to the absence of protective Cr and Mo. Ni 3 (Si,Ti) with Al and Ni 3 (Si,Ti) with Cr showed intergranular corrosion in less corrosive HNO 3 .