Effect of ferrous ion concentration on the electrodeposition of iron-nickel alloys

Abstract

: NiÈFe alloys were deposited galvanostatically on the disk part of the platinum rotating ring-disk electrodes (RRDEs). Contents of nickel and iron were determined using the electrochemical stripping method. It was shown experimentally and explained theoretically that nickel deposition rate is inhibited as the ferrous ion concentration in the bath is increased. A mathematical model that includes the phenomenon of surface competition between FeOH`and NiOH`ions can quantify the inhibition of nickel deposition rate in the presence of ferrous ion species.

The Inhibition of Anomalous Codeposition of Iron-Group Alloys Using Cyclic Voltammetry

“…The electroplating of iron-group binary alloys ͑e.g., Co-Ni, Fe-Co, Fe-Ni, Zn-Fe, and Zn-Ni͒ is generally recognized as a codeposition of the anomalous type 5,6,[11][12][13][14][15][16][17][18][19][20] because the composition of the more active metals within the deposits is higher than that in the plating baths. Several models reasonably and quantitatively describe these anomalous phenomena.…”

Controllable Structure and Magnetic Properties of Co2FeGa Films Prepared by Electrodeposition

“…10 Since the adsorption ability of a less noble metal hydroxide (Ga(OH) 2+ in this case) is considered to be higher than that of a more noble metal hydroxide (Co(OH) + in this case), the enhanced Ga reduction causes an increasing content of Ga in the deposits. 11,12 On the other hand, as the Ga hydroxyl ions occupy the electrode active surface area, a less active area is available for the reduction of Co hydroxyl ions, the Co reduction is limited. As a result, the content of Co in the deposits decreases.…”