The galvanostatic oxidation of nickel in molten (Na, K)NO3 eutectic has been investigated at temperatures rangzng from 250–450°c. The results obtained show that nickel undergoes spontaneous passivation in the melt with the formation of NiO. Galvanostatic polarisation of nickel in the melt gives a clear arrest at low temperatures and more than one arrest at high temperatures. These arrests may be attributed to the formation of higher nickel oxzdes such as Ni3O4, Ni2O3 and NiO2 rather than NiO. At high current densities the simultaneous discharge of nitrite and oxide ions occurs on the electrode surface.
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References
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BarakaR. M., ThesisMSc, Cairo University, 1983
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Shams El-DinA.M., El-Hosary, A. A., & Gerges, A. A. A., J. elect roanal. Chem., 1963, 6, 131
