Hot-dip galvanized zinc-nickel alloy
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Product Description
New zinc-nickel alloy hot-dip coating
Uses and Advantages
① No changes are required to the galvanizing equipment or processes.
② The alloy exhibits a high degree of homogenization, and the addition of alloying elements improves the fluidity of the molten zinc.
③ The plating surface is smooth and bright, with few burrs and nodules; the plating thickness is appropriately reduced, adhesion to the steel substrate is excellent, and color variation of the plating is minimized.
④ The coating quality of active steels (i.e., high-silicon, high-manganese steels) is significantly improved, resulting in reduced zinc consumption.
⑤ Uniformly enhances the corrosion resistance of the coating, improves its impact resistance, increases surface hardness, and extends the service life of the workpiece.
How to Use
① The galvanizing temperature should be 430°C to 460°C, with a nickel content of 0.04% to 0.06% in the zinc bath. A recommended galvanizing temperature is 435°C ± 5°C, and the nickel content in the zinc bath should be maintained at around 0.05%. When adding alloy, place the zinc-nickel alloy in a hanging basket, immerse it in the zinc bath (as close as possible to the surface), and slowly move it along the length of the zinc pot to ensure uniform melting and incorporation of the alloy into the zinc bath.
② Before converting conventional zinc melt into zinc alloy melt in the zinc pot, thoroughly skim off the zinc dross and allow the melt to stand for 6–8 hours. Then add an alloy at 3%–6% of the total molten zinc charge (for example, Zn–1% Ni; the addition ratio varies depending on the specific formulation). Once the conversion is complete, add zinc–nickel alloy at 3%–6% of the daily zinc addition each time zinc is replenished. It is important to regularly monitor the nickel content in the zinc melt, conducting such checks twice a week.
Precautions
① If the zinc-nickel alloy is added unevenly, tiny zinc-nickel alloy particles may appear on the surface of the plated part. When this phenomenon is observed, the addition of the zinc-nickel alloy should be temporarily halted; once the tiny particles have fully dissolved, the addition may resume.
② For workpieces prone to producing dull, lackluster coatings (such as 16Mn steel), a lower galvanizing temperature (435°C) may be used, the time between galvanizing and water quenching should be minimized, and the nickel content in the zinc bath can be appropriately increased.
③ The iron content in the fluxing agent should be carefully controlled to ensure coating thickness and reduce zinc dross.
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