Corrosion of copper, titanium, nickel and chromium- and nickel-containing steels (10Kh17N13M3T, K18, 08Kh13, 12Kh18N10T, St3, St45, armco iron) in a melted condensed sodium phosphate in the presence of bivalent salts of manganese and magnesium has been studied using the gravimetric method. The corrosion resistance decrease in the following sequence: nickel-copper-alloyed steel-titanium-St45, has been established. A shift of corrosion potentials to the region of their electronegative values is observed in this sequence. Titanium and nickel tendency to passivation is observed, which is not characteristic for copper and St45.