Zinc-nickel alloy
Zinc–nickel alloy electroplating processes are categorized into alkaline and acidic types; the alkaline process offers superior stability and excellent coating quality.
Features:
1. Excellent corrosion resistance, 4 to 8 times that of a pure zinc coating of the same thickness.
2. The coating must exhibit sufficient adhesion to the substrate to ensure that it delivers its superior corrosion resistance.
4. Excellent thermal fatigue resistance. Within the temperature range of –60 to 250°C, the coating exhibits no change in corrosion resistance after undergoing rapid cooling and heating cycles.
5. Its processability is comparable to that of a pure zinc coating. Even after deformation, the coating retains superior corrosion resistance compared to a pure zinc coating.
6. Low hydrogen embrittlement. The hydrogen embrittlement rate of zinc–nickel alloy coatings is only 1.5%, whereas the embrittlement rate of electroplated pure zinc typically exceeds 40%.
7. The zinc-nickel alloy coating exhibits higher hardness than pure zinc, thereby offering superior wear resistance.
8. The process is easy to operate, exhibits excellent deep‑plating capability, offers a rapid deposition rate, and allows for stable control of the nickel content in the coating.
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