[en] The corrosion resistance of Alloy Ti35 (Ti-5%Ta) in the nitric acid solution from the view of electrochemical factor is evaluated. Tested the anodic polarization curves in different temperature, concentration and additional ions. The results showed: In the same temperature the increase of concentration of nitric acid enhanced the corrosion of Ti; in the same concentration, the increase of temperature restrained the corrosion. The concentration of Cr⁶⁺ did not influence the results acutely. Cr⁶⁺, Ru³⁺ restrained the corrosion greatly despite the affection of uranium is weak. After the surface observation, the SS were found more sensible to the concentration of HNO₃ than Ti35; the oxiding ions influenced corrosion resistance of the SS harder. It indicated that the Ti35 could instead the SS to be used on the reprocessing equipment because of the better corrosion resistance. (authors)