Pitting Corrosion Behavior of 0Cr13 Ferritic Stainless Steel in FeCl₃ Solution

Pitting corrosion behavior of 0Cr13 ferritic stainless steel in FeCl₃ solution was studied by corrosion immersion test, corrosion morphology observation and polarization curve testing. The results show that obvious general corrosion occurred during the pitting corrosion process in 6% (mass) FeCl₃ solution. The quantity and depth of pits increased with the rise in temperature, and general corrosion was more serious. Pitting morphology was disturbed by the thickness reduction of specimen because of general corrosion, so the degree of pitting corrosion could not be reflected accurately. The pits occurring in the surface of 0Cr13 stainless steel had open style shapes, with substantial quantity but small depth. However, the pits occurring in the surface of 304L stainless steel had subsurface style shape or undercutting style shape, which had more deep cutting power and destructive ability.