✍ Scribed by Rodnei Bertazzoli; Derek Pletcher
No coin nor oath required. For personal study only.
The electrodeposition of F+Co alloy onto vitreous carbon has been investigated from a sulphate bath containing boric acid at pH 4. It is shown that the composition of the alloy is mainly determined by the ratio of Fe(II)/Co(II) in solution and only slightly by temperature or potential/current density. The Fe content of the alloy is always higher than the ratio of Fe(II)/Co(II) in solution despite the observation from studies of the solutions of Fe(H) and Co(I1) alone that the Fe(H) is more difficult to reduce than Co(H) by 200mV. The kinetics of the nucleation and early growth of the metal lattices as well as the kinetics of the M/M'+ couples have been studied. The equilibrium potentials of the alloys in the plating solutions are close to that for the Co/Co(H) couple but the presence of Fe(H) in solution changes the mechanism for cobalt deposition as well as inhibiting the early stages of nucleation and growth.
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