Abstract
The corrosion of molybdenum and tungsten has been examined in static and dynamic liquid sodium. Corrosion of molybdenum was not found to be oxygen dependent; no ternary oxide corrosion products were observed. Inclusion of labile carbon into the system containing molybdenum caused the formation of molybdenum carbide, Mo 2C, which was identified by its powder X-ray diffraction pattern. The corrosion of tungsten was found to be strongly influenced by the initial concentration of dissolved oxygen in the liquid metal; at low oxygen levels in the dynamic system the cubic phase, Na 3WO 4 ( a 0 = 4.62 A ̊ ), was identified by its X-ray diffraction pattern recorded through a matrix of sodium, whereas, at initially very high oxygen levels in static systems, the orthorhombic phase, Na 6WO 6, was identified. The solid-state interaction of sodium oxide with molybdenum and tungsten metals under vacuum give the ternary phases Na 4MoO 5 and Na 6WO 6, respectively, together with unreacted refractory metal and sodium vapour.
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