Alloys containing molybdenum are characterised by a high hardness, wear, corrosion resistance and good catalytic properties for hydrogen evolution.. They also offer an important alternative to toxic, hard chromium coatings. It is known that molybdenum cannot be electrodeposited in the pure state from aqueous solution, but it can readily be co-deposited with iron-group metals such as nickel to form an alloy. The phenomenon has been called induced co-deposition. Binary Ni-Mo coatings can be electrodeposited at room temperature from aqueous electrolytes despite of the large difference in melting points of these metals and limited their mutual solubility. In the present work, the effect of the citrate electrolyte composition (pH 8) on the partial polarisation behaviours was investigated under potentiostatic conditions using a rotating disk electrode system (RDE). The kinetic correlations in co-discharge process of Mo(VI) and Ni(II) complex ions have been established. The relationship between electrodeposition parameters, structural properties and functionality has also been determined.

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