Static corrosion of Fe-C-Cr alloys and erosion of Fe-C and Fe-Cr alloys due to the contact with liquid bismuth were studied. For the static corrosion test, magnesium as a deoxidant and zirconium as an inhibitant were added into liquid bismuth prior to the immersion of specimens. The erosion test was carried out by applying an ultrasonic oscillation of 20±2 kc in frequency and 15 microns in amplitude. The results obtained were as follows. (1) In Fe-C alloys, when the carbon content increases the degree of static, corrosion becomes less. In Fe-C-Cr alloys, the chromium content enhances the degree of static corrosion. For the inhibition of corrosion the increase of carbon content in the alloy may be necessary. (2) From the erosion test it was found that the surface pits are not due to a chemical corrosion but to a mechanical attack, and that the degree of erosion chiefly depends on the hardness of the alloy
