A. V. Abramov, I. B. Polovov, A. F. Gibadullina, R. R. Alimgulov, A. I. Trubcheninova, M. S. Karabanalov
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Abstract—The influence of the composition of nickel alloys on the mechanism of their corrosion in NaCl–KCl-based chloride melts has been analyzed. Nickel alloys NIMONIC 80A alloy, VDM Alloy 718, INCONEL alloy C-276 with different compositions of the matrix and alloying additives have been selected as the investigated materials. The corrosion rates of these alloys in NaCl–KCl and NaCl–KCl + UCl4 salt systems after exposure for 100 h at 750°C has been found. It has been shown that NIMONIC 80A alloy containing high-chromium excess phases is subjected to intergranular corrosion after only 30 hours of contact with NaCl–KCl. It has been demonstrated that continuous nonuniform corrosion is the main reason for damage of VDM 718 alloy (which also has excess phases in the microstructure) after 100 h of exposure in NaCl–KCl. Although prominent secondary-phase grain-boundary chainlike precipitates arise in INCONEL C-276 alloy at 750°C, its surface exhibits continuous uniform damage. From data obtained it was concluded that secondary phases arising in VDM 718 alloy and INCONEL C-276 alloy serve as cathodes of galvanic microcouples. Therfore intergranular corrosion (IGC) on the surface of these alloys has not been observed. It has been shown in a series of special experiments that in uranium-containing chloride melt, the corrosion rate rises by many times and the type of surface damage becomes basically the same—continuous nonuniform.
期刊介绍：
Russian Metallurgy (Metally) publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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