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Impedance Measurements on UO2 in Salt Brines

Within the frame of performing investigations into corrosion on U0 2 relevant for the direct disposal of spent fuel in salt diapirs, impedance measurements have been carried out simultaneously with potentiostatic and radiochemical experiments in Q-brine, solution 3 and saturated NaCl solution in order to study the influence of surface layers on corrosion. This in situ method permits the formation and dissolution of passive layers to be examined at various potentials within the range from — 1300mV to + 1700 mV SHE. The results obtained from the experiments show that a passive layer of UO, is formed at the surface of the U0 2 electrode at potentials lower than +600 mV SHE. This range represents the region of rest potentials in aerated and saturated salt solution. The thickness of the layer increases with time. Furthermore at potentials higher than +600 mV SHE U0 2 corrodes drastically.