電析Ni-P合金の析出機構について

概要

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Ni-P alloys were electrodeposited using simple chloride baths containing 0 to 0.24 mol/L of phosphorus acids (H3PO2, H3PO3 and H3PO4). In the case of baths containing H3PO4, pure Ni was plated with hydrogen gas evolution, while the H3PO2 and H3PO3 baths yielded the corresponding Ni-P alloy at various current efficiencies and with a phosphorus content of 0 to 17 weight percent. As a result of electrochemical experiments and thermodynamic analysis involving the Gibbs free energy change in the deposition process, equations (1)-(3) were developed for alloy deposition in the phosphorous acid baths.2H++2e-→H2……(1)Ni2++2e-→Ni……(2)3Ni2++H3PO3+3H+6e-→Ni3P+3H2O……(3)The calculated values of the Gibbs free energy change for equation (3) showed that the induced co-deposition mechanism with phosphorus and nickel metal was reasonably explained by the strong atomic interaction between Ni and P.
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