The self-passivation process and corrosion resistance of the ironchromium based alloys and also of the alloys containing molybdenum, nickel, nitrogen and of the same alloys with 0.2% Pd additions were studied in sulfuric arid hydrochloric acid solutions.
The addition of Pd to Fe-Cr alloys causes their self-passivation and considerably enhances their corrosion resistance. The self-passivation of the alloys with Pd, which results from the accumulation of Pd on the surface during the initial period of an active dissolution and potential shift to the positive range, depends on the possibility of passivation of the base alloy under the conditions present during this shifting of alloy potential. It is known that alloys of iron with chromium at chromium contents higher than 12% passivate under anodic polarization in sulfuric acid solutions.1,2
The investigation of the electrochemical and corrosion proper ties of Fe-Cr (25 to 80% Cr) alloys has shown (Figure 1...
