Hot-Dip Galvanized Novel Zinc-Bismuth Alloy
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Product Description
Hot-Dip Galvanized Novel Zinc-Bismuth Alloy
Uses and Advantages
① Adding bismuth to the zinc bath can enhance its fluidity, reduce its surface tension, and enable the plating layer on the substrate surface to adhere more effectively after immersion plating.
② The presence of bismuth in the zinc bath provides protective effects on the pot, thereby extending its service life.
③ Bismuth can reduce the formation of zinc dross.
④A zinc bath with a nickel content of 0.04% and a bismuth content of approximately 0.1% exhibits superior performance in effectively promoting the Fe–Zn reaction on Steldein steel compared with a pure zinc–nickel zinc bath composition.
How to Use
① When using hot-dip galvanized bismuth alloy, manufacturers generally do not need to modify their conventional hot-dip galvanizing equipment or processes. The recommended zinc bath temperature is around 440°C, and the addition rate can be 0.5 to 1 kg of alloy per ton of ferrous parts. Manufacturers may add the alloy directly to the surface of the zinc bath based on the amount already present in the bath, while carefully controlling the alloy element content.
②The addition method involves thoroughly stirring the zinc melt and continuously agitating it within the pot to ensure rapid and uniform distribution until complete homogenization is achieved.
Precautions
① If the alloy is added unevenly, the plated part may appear whitish. If this occurs, suspend further alloy addition and resume only after the alloy has fully dissolved.
② For workpieces prone to producing dull, lackluster coatings (such as 16Mn steel), a lower galvanizing temperature (<440°C) may be used, the time between galvanizing and water cooling should be minimized, and the alloying element content in the zinc bath may be appropriately increased.
③ The iron content in the fluxing agent should be carefully controlled to ensure coating quality and minimize zinc dross.
④ If special material treatment is suboptimal, please notify our company so that we can provide timely service.
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