Abstract
The electrochemistry of glassy melt‐spun 60 atom percent (a/o) Ni‐40 a/o Nb was investigated at moderate temperatures in various aqueous media. The alloy was very corrosion resistant to most acids and alkalis, but it was attacked by aqueous . Cyclic voltammograms of the glassy alloy in indicated the existence of a thin nickel oxide corrosion layer from which niobium was absent. Linear sweep voltammetry in the oxygen evolution region, constant current chronopotentiometry, and rest potential decay measurements confirmed that the alloy surface in alkali consisted of nickel oxides. Chronopotentiometry in at 30°C indicated the formation of a thin niobium oxide corrosion film which did not prevent oxygen evolution. Anodization in concentrated neutral caused severe corrosion. On cathodization in acid, the glassy alloy absorbed ca. 14 a/o hydrogen and was severely embrittled. Attempted hydrogen permeation experiments caused ribbon fracture; as‐quenched and low temperature‐annealed glasses behaved differently in this respect.
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