Corrosion of metals and alloys in molten glasses. Part 2: nickel and cobalt high chromium superalloys behaviour and protection

A new anode material for oxygen evolution in molten oxide electrolysis

“…The fact that the oxygen content of the outlet 13 gas gradually reaches values comparable to those observed with a noble-metal anode in the same 14 cell 13 is evidence of successful production of oxygen with this new anode material. Its measured 15 faradaic efficiency based on the recovered oxygen and taking into account typical consumption by 16 oxidation of the inactive parts of the furnace (molybdenum current collectors mainly) is around 17 24%, similar to that previously obtained with an iridium anode. Furthermore, the oxygen 18 concentration in the anode off-gas scales with current density.…”

“…2a), in agreement 11 with both the thermodynamic prediction and the experimental measurements of chromium oxide 12 chemical solubility in an oxide melt of this specific composition (supplementary discussion A). 13 The composition and morphology of the oxide scale was found to be pretty much independent of 14 the composition of the base alloy, which influenced mainly the extent of chromium depletion 15 Figure S2). In the case of pure chromium, the inner layer proved to contain a 16 higher concentration of aluminium, and the outer layer exhibited a non-negligible concentration of 17 calcium.…”

Corrosion of Chromium in Glass Melts

“…[1][2][3] Generally, when a given material is used for a specific application, the process is never changed because it is known that a variation of one parameter can drastically change the metal behavior in molten glass, particularly its corrosion resistance. 4 One of the most important parameters is the glass temperature.…”

“…[5][6][7] Many works concerning the study of the pure metals behavior in glass melts have been realized since the late 1950s. The most recent works concern Pt, 4,[8][9][10][11] Mo, 9,10,12,13 W, 14 Ta, 10,15 Nb, 16 Ti, [17][18][19] Zr, 20 Ni, 2,21 Fe, Co, and Cr, 2,22 which are proposed to be used in the glass-making industry as raw materials or coatings on ceramics. The results of these studies indicate that the behavior of pure metals immersed in molten glasses ͑in terms of corrosion rates and corrosion layers͒ varies with glass composition, melt temperature, and the metal potential ͑in the case of use of the material as a fusion electrode͒.…”

Effect of Cr addition on γ–γ′ cobalt-based Co–Mo–Al–Ta class of superalloys: a combined experimental and computational study

“…Efforts toward the use of cobalt-based alloys have accelerated in recent time when c-c 0 microstructure in the Co-Al-W was exploited in developing newer alloys [6][7][8][9]. Cobaltbased superalloys were known for their excellent oxidation and hot corrosion resistance at high temperatures compared to nickel-based superalloys [10][11][12]. But due to their low strength values, these were unable to compete with nickel-based superalloys that are being used with expensive thermal barrier coatings [13,14].…”