Abstract

The effect of nickel plating on the hydriding and dehydriding characteristics of magnesium were studied. It was found that the nickel in an electroless plated form (nominal composition, 0–10 wt.% Ni) had little effect on the initial activation, the maximum achievable capacity and the absorption kinetics. The effect on desorption kinetics, however, was profound. Nickel plating improved the kinetics to the range required for automotive applications, but the rate decayed rapidly with cycling because of sintering of the nickel on the magnesium surface. This decay suggests that an important parameter influencing the desorption rate is the amount of surface nickel in contact with magnesium. Further work with these systems may lead to an Mg/Ni system with a minimum nickel content and desorption rates approaching those of Mg 2Ni.

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