CHIMI FLUX Powder
ZnCl₂·2NH₄Cl
Zinc ammonium chloride is a double-salt galvanizing flux (ZnCl₂·2NH₄Cl) supplied as a white crystalline powder for hot-dip galvanizing. CHIMI FLUX Powder is a high-speed galvanizing grade that dissolves readily in water to prepare flux baths, giving low fuming, negligible ash and thin, uniform zinc coats. Manufactured by CHIMI ART in Egypt, it is supplied in 25 kg and 50 kg bags with technical documentation for every batch.
Product Overview
Zinc ammonium chloride is a double-salt galvanizing flux (ZnCl₂·2NH₄Cl) supplied as a white crystalline powder for hot-dip galvanizing. CHIMI FLUX Powder is a high-speed galvanizing grade that dissolves readily in water to prepare flux baths, giving low fuming, negligible ash and thin, uniform zinc coats. Manufactured by CHIMI ART in Egypt, it is supplied in 25 kg and 50 kg bags with technical documentation for every batch.
Technical Specifications
- Chemical Formula
- ZnCl₂·2NH₄Cl
- CAS Number
- 14639-97-5
- Appearance
- White crystalline powder
- Concentration
- High-speed galvanizing grade
- Solubility
- Water soluble
- Available Packaging
- 25kg bags · 50kg bags
- Shelf Life
- 24 months
- Storage Conditions
- Dry, moisture-free
| Property | Value |
|---|---|
| Chemical Formula | ZnCl₂·2NH₄Cl |
| CAS Number | 14639-97-5 |
| Appearance | White crystalline powder |
| Concentration | High-speed galvanizing grade |
| Solubility | Water soluble |
| Available Packaging | 25kg bags · 50kg bags |
| Shelf Life | 24 months |
| Storage Conditions | Dry, moisture-free |
Applications
Dosing Guidelines
Prepare the flux bath by dissolving CHIMI FLUX Powder in water at a typical bath concentration of 200-400 g/L, operated at 60-80°C. Immerse work for 1-3 minutes depending on surface condition, then allow it to drain and dry before the zinc dip. Exact bath strength, temperature and immersion time depend on line speed, steel type and the quality of upstream pickling and rinsing, so confirm settings through plant trials. Monitor bath density and iron content regularly: iron carried over from the pickling line degrades flux performance and increases dross, so keep rinsing effective and correct the bath with fresh powder as analysis indicates.
How It Works
In hot-dip galvanizing, the flux bath is the last chemical stage before the zinc kettle. Dissolved zinc ammonium chloride deposits a thin salt film on the steel as it leaves the bath and dries. This film performs three functions. First, it chemically cleans the surface: at dipping temperature the ammonium chloride decomposes and scours away residual iron oxides and salts left after pickling and rinsing. Second, it protects the activated steel from re-oxidation in the interval between fluxing and immersion in molten zinc. Third, it lowers surface tension at the steel-zinc interface, promoting rapid wetting so the iron-zinc alloy layers form evenly across the work. The double-salt composition of CHIMI FLUX Powder is balanced for high line speeds, burning off cleanly with low fume and negligible ash so dross and surface defects are minimised.
Usage Tips
Zinc ammonium chloride is hygroscopic: store CHIMI FLUX Powder in its sealed 25 kg or 50 kg bags in a dry, moisture-free area off the floor, and reseal opened bags immediately. Stored correctly it has a shelf life of 24 months. Wear gloves, goggles and dust protection when charging baths, and ensure good ventilation over the flux tank. Avoid contact with strong oxidisers and keep the product away from foodstuffs. Consult the SDS before first use and follow local regulations for disposal of spent flux liquor.
Certifications & Compliance
Related Products in This Family
Frequently Asked Questions
What is the difference between CHIMI FLUX Powder and CHIMI FLUX Solution?
Both are based on the same zinc ammonium chloride double salt. The powder is dissolved on site to build and correct flux baths at the concentration your line requires, and is the economical choice for high-volume hot-dip galvanizing. The ready-to-use solution (25-30% active) suits plants that prefer liquid handling, or applications such as welding preparation and tin immersion.
What bath concentration should I run for hot-dip galvanizing?
A typical starting point is 200-400 g/L at 60-80°C with 1-3 minutes immersion, adjusted for line speed, steel type and pickling quality. Confirm the optimum through plant trials and routine bath analysis, and correct with fresh powder as density drops.
Why does flux bath iron content matter?
Iron carried over from pickling accumulates in the flux bath and is dragged into the zinc kettle, where it forms dross and causes coating defects. Keep rinsing effective, monitor iron regularly, and treat or partially renew the bath when levels climb.
How should zinc ammonium chloride powder be stored?
The salt is hygroscopic, so keep bags sealed in a dry, moisture-free store off the floor. Under these conditions shelf life is 24 months. Caked material that has absorbed moisture can usually still be dissolved for bath make-up, but check the SDS and confirm bath strength by density measurement.
What packaging is CHIMI FLUX Powder available in?
It is supplied in 25 kg and 50 kg bags. Each delivery is accompanied by technical documentation, and TDS and SDS are available for download on this page. Contact our sales team for pallet quantities and export packing.
Need a Custom Solution?
Request a quote, discuss your specifications, or schedule a facility visit. Our technical team responds within 24 hours.