Abstract
The electrochemical hydrogen adsorption/desorption behaviour of intermetallic Ni 3 (Si,Ti) alloy with additions of boron and chromium has been investigated by cyclic voltammetry in alkaline solution to understand the remarkable improvement in their susceptibility to hydrogen-induced embrittlement. The voltammogram shows a cathodic peak and two anodic peaks attributable, respectively, to adsorption and desorption of hydrogen species at the surface. The effects of alloying elements of B and Cr on these peak currents and the hydrogen evolution are presented and discussed. It is found that the addition of B and Cr to the Ni 3 (Si.Ti) alloy plays an important role in the hydrogen adsorption/desorption behaviour of ordered intermetallics by promoting the desorption of H ads . The addition of B and Cr facilitated greater desorption of hydrogen species from the surface and delayed the tendency for hydrogen-induced embrittlement.
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