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Corrosion of Hydrides of Nickel and Cu30Ni Alloy in Oxygen Containing Solutions |
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23.09.2008 г. |
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Corrosion of Hydrides of Nickel and Cu30Ni Alloy in Oxygen Containing Solutions G. N. Markos’yan, D. S. Sirota, and A. P. Pchel’nikov Karpov Institute of Physical Chemistry State Scientific Center of the Russian Federation,
ul. Vorontsovo Pole 10, Moscow, 103064 Russia e-mail:
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Received July 27, 2004 Abstract — Corrosion behavior of nickel hydride is studied in alkaline, neutral, and weakly acidic oxygen-containing solutions by compensating oxygen consumed in corrosion and spectrophotometric analysis of solution for nickel. It is shown that in the course of nickel hydride corrosion in alkaline solutions, oxygen is consumed solely in its interaction with hydrogen formed at hydride decomposition, while nickel remains at the surface. It is concluded that, in a pH range from 7 to 14, hydrogen oxidation is limited by its solid-phase diffusion, whereas the rate of nickel hydride decomposition is pH-independent. The difference in the corrosion behavior of the original alloy and its hydride is attributed to the fact that the original alloy evolves copper ions, whereas the hydride evolves hydrogen.
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