Zinc Cyanide Plating Bath Storage — Alkaline-Cyanide Zinc Electrolyte Tank Selection

Storing Zinc Cyanide Plating Bath? Start Here

If you're working with zinc cyanide plating baths, you're dealing with a powerful alkaline solution used in industrial plating processes. This solution is particularly valued for its ability to coat complex parts evenly and adhere well to hardened steel, which is crucial in industries like automotive and aerospace. However, the use of cyanide means it requires careful handling and storage.

Can you store it in a poly tank?

Yes, you can store zinc cyanide plating bath in polyethylene tanks. High-density polyethylene (HDPE) or cross-linked polyethylene (XLPE) tanks are standard for this purpose due to their resistance to the alkaline and cyanide components of the bath. Ensure the tank is rated for the bath's specific gravity, typically between 1.0-1.2 SG.

Key Issue: Hydrogen Cyanide Emissions

One critical concern with zinc cyanide plating baths is the potential release of hydrogen cyanide gas, especially if the bath contacts acids. To mitigate this risk, it's essential to use a fume scrubber system, typically packed-bed with caustic recirculation, to control emissions and ensure workplace safety.

The safety that actually matters

• Use tanks and fittings that are resistant to strong alkalines and cyanides.
• Implement fume scrubbers to manage any gas emissions.
• Regularly inspect storage systems for leaks or damage.

Common questions

What materials are best for gaskets?

EPDM is standard for alkaline and cyanide compatibility, but Viton is preferred for severe service.

Can I use aluminum or copper tanks?

No, aluminum and copper are not suitable due to severe corrosion and cyanide-leaching risks.

What tank sizes are typical?

HDPE tanks range from 500 to 5,000 gallons, while FRP tanks can be custom-fabricated up to 15,000 gallons.