The corrosion behavior of the intermetallic compounds homogenized, Ni-3(Si,Ti) (L1(2): single phase) and Ni-3(Si,Ti) + 2Mo (L1(2) and (L1(2) + Ni-ss) mixture region), has been investigated using an immersion test, electrochemical method and surface analytical method (SEM; scanning electron microscope and EPMA: electron probe microanalysis) in 0.5 kmol/m(3) H2SO4 and 0.5 kmol/m(3) HCl solutions at 303 K. In addition, the corrosion behavior of a solution annealed austenitic stainless steel type 304 was studied under the same experimental conditions as a reference. It was found that the intergranular attack was observed for Ni-3(Si,Ti) at an initial stage of the immersion test, but not Ni-3(Si,Ti) + 2Mo, while Ni-3(Si,Ti) + 2Mo had the preferential dissolution of L1(2) with a lower Mo concentration compared to (L1(2) + Ni-ss) mixture region. From the immersion test and polarization curves, Ni-3(Si,Ti) + 2Mo showed the lowest corrosion resistance in both solutions and Ni-3(Si,Ti) had the highest corrosion resistance in the HCl solution, but not in the H2SO4 solution. For instance, it was found that unlike type 304 stainless steel, these intermetallic compounds were difficult to form a stable passive film in the H2SO4 solution. The results obtained were explained in terms of boron segregation at grain boundaries, Mo enrichment and film stability (or strength). (C) 2011 Elsevier B. V. All rights reserved.