The Electrochemical Behavior of 
-Phase in the Cu30Ni
H System in Sodium Hydroxide Solutions
D. S. Sirota and A. P. Pchel’nikov
State scientific center of the Russian Federation “Karpov Institute of Physical Chemistry,”
ul. Vorontsovo Pole 10, Moscow, 103064 Russia
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Received July 21, 2004
Abstract — The electrochemical behavior of Cu30Ni alloy hydride in 1 N NaOH solution was studied. One-shot and cyclic voltammograms, chronocoulometric, amperometric, and potentiometric curves, as well as time variation of the open-circuit (free-corrosion) potential Ecor, were measured. Both types of voltammograms show a limiting current plateau, which can be explained by a preceding chemical reaction of the hydride decomposi-tion. It is concluded (from the character of Ecor vs. t curves) that the hydride decomposition involves the alloy’s copper component activation through the copper oxide reduction with hydrogen. The alloy hydride decomposition rate was determined by using chronocoulometry: V = 4.6 
10–4 A/cm2 . No potential arrest was observed in the Ecor vs. t and E vs. t curves, which is due to concurrent reactions of electrochemical and chemical recom-bination involving hydrogen atoms adsorbed at the alloy surface.
10–4 A/cm2 . No potential arrest was observed in the Ecor vs. t and E vs. t curves, which is due to concurrent reactions of electrochemical and chemical recom-bination involving hydrogen atoms adsorbed at the alloy surface.