Preparation of Zn-Ni-P Alloys with High Zn Content Using Electrochemical Processes

In this study, Zn-Ni-P alloys were prepared via an electrodeposition method under alkaline conditions. The electrolysis potential and composition of the electrolysis bath were important factors in controlling the Zn content and corrosion resistance. The Zn-Ni-P alloys contained 19.2-82.7 mol% Zn, with amorphous Zn-Ni-P alloys containing 19.2-58.1 mol% Zn. The amorphous alloys were black, and their surfaces were covered with fine grains with elemental compositions identical to those of the corresponding alloys. In addition, the amorphous Zn-Ni-P alloys did not exhibit X-ray diffraction peaks corresponding to Ni, Zn, or Ni5Zn21, and their corrosion resistance was the same as that of Ni-P alloys. Furthermore, it was determined that the corrosion resistance of the alloys was related to their porosity.