Zinc-alloy depositions are now largely used thanks to their good corrosion behaviour (as compared to zinc depositions). Phosphorus was introduced in the metallic matrix in order to increase the corrosion resistance of Zn-Ni platings. Strongly alkaline electrolytes were used (pH=12-12.5), in order to obtain Zn-Ni-P deposits. The characteristics of these depositions (chemical composition, structure) were studied in correlation with their performances of corrosion resistance. The qualitative analysis carried out by X-ray diffraction revealed that as part of Zn-Ni alloy, P reduces the grain size, also bringing about a tendency towards an amorphous crystal lattice.
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