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The electrocatalytic properties of Ni­Mo alloys are desirable for a wide range of electrochemical applications. However, electrodeposited Ni­Mo alloys suffer from high internal stress and low ductility. In this study, we electrodeposited Ni­Mo alloys by intermittently adding different concentrations of sodium molybdate. The microstructure and mechanical properties of the resulting alloys were examined. We identified a critical point for the Mo concentration in the deposition bath at which the properties of the electrodeposited alloys changed sharply. When the Mo concentration was below a certain threshold, the alloys consisted of relatively large grains (approximately 30­50 nm) and exhibited a tensile of approximately 10%. Conversely, when the concentration exceeded the threshold, the grain size decreased to approximately 15 nm and the ductility was limited. X-ray photoelectron spectroscopy indicated that the change of the properties corresponded to inclusion of oxides of molybdenum. On the basis of these results we suggest that producing ductile Ni­Mo alloys requires the Mo concentration in the deposition bath to be maintained at low levels. [doi:10.2320/matertrans.MAW201801]

Fabrication of Bulk Ni–Mo Alloys by Electrodeposition with Intermittent Addition of Sodium Molybdate