The change of the composition of electrodeposited Fe-Ni, Ni-Co and Co-Fe alloys under various electrolytic conditions was investigated. Electrolytes mixed with two sulfate solutions were used. In order to make nickel electrodeposit with cobalt or iron, it required excess of nickel in the bath as the former was hard to deposit in comparison with the latters. It was observel that the composition of alloys was changed by the hydrogen ion concentrations, current densities, or temperatures etc. But, if we choose moderate electrolytic conditions, we can obtain the spontaneous component alloys freely.
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