Peculiarities of the anodic dissolution of a powder NiSi electrode

The dissolution of solid and powder NiSi electrodes in a 0.5 M H2SO4 contai ning 0-50 mM sodium fluoride is studied by methods of quasi-steady-state an d cyclic voltammetry. The powder electrodes are inferior to solid ones in c orrosion resistance and are less readily passivated compared to smooth NiSi and even Ni electrodes. The anodic dissolution rate of NiSi considerably i ncreases in the presence of fluoride; the effect being more pronounced in t he case of smooth electrode.