[en] Periodical increase of corrosion potentials and nominal standard potentials in transition metal series of the 4th, 5th, and 6th periods of the periodical system was noted in molten mixtures of sodium polyphosphate and tetraborate and potassium tetrafluoborate, as well as in equimolar mixture of sodium and potassium chlorides at 1173K. Nickel, molybdenum and platinum are characterized by high corrosion resistance in molten salts. The similar strength of these metals was noted at 1123 K in atmosphere of argon and titanium tetrachloride mixture. Austenitic steels and alloys, containing mentioned metals as alloying components, were noted for high corrosion resistance in corrosive media