Abstract
The electrode position of nickel with zinc in presence of boric acid was studied in order to determine the influence of the composition of the deposition solution on the properties of the obtained electrodeposits. The Ni / Zn concentrations ratio in solution determines the deposition mechanism and thus, the chemical composition and the electrochemical activity of the electrodeposited alloys. Boric acid decreases current density which minimizes anomalous deposition. The typical results from these acidic media are the formation of Ni-rich alloys (%Ni > 90) by a normal code position mechanism with a better electrochemical activity than Ni for the hydrogen evolution reaction HER reaction. Results show that it is possible to obtain alloys rich in either zinc or nickel, from an acidic solution containing boric acid. For Ni / Zn concentration ratios in the range of 1-3, Zn-rich alloys are obtained despite Zn is the less noble element and even when it is present at lower concentrations than Ni, confirming that at these conditions alloys are deposited by an anomalous deposition mechanism as reported by many researchers1,2,3
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