Rotating Cylinder Electrode Study of the Electrodeposition of New Corrosion‐Resistant Nickel‐Zinc‐Phosphorus Alloys

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Abstract
The rate limiting factors of the electrodeposition of nickel‐zinc‐phosphorus alloys at a rotating cylinder electrode have been determined using the partial deposition currents of the alloy components. The mass‐transfer coefficient for the rotating cylinder shows that the electrode probably behaves as a hydrodynamically smooth electrode during the deposition process. A zinc current plateau observed at lower temperatures (≤60°C) and higher currents (>0.5 A/cm2) is probably due to mass‐transfer limitation of the zinc deposition reaction. At low currents, the alloy deposition process is controlled by zinc deposition at lower temperatures (<60°C) and by the deposition of nickel at higher temperatures. At high current densities, the alloy deposition is under the mixed control of the deposition of both nickel and zinc.

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