The authoritative public forum
  for Metal Finishing since 1989
  

  -----

Chemicals for Electrogalvanizing of Wire

we are going to start an electro galvanizing unit for thin m.s law carbon wire. We are expecting fine polishing and high softness kindly advise us the chemicals to be used and sources best.

Sunilmenon
- Oman
2000

Dear Sir/Madam.We are running an Electro Galvanizing facility in Karachi, Pakistan. We galvanize mild steel low carbon annealed wires which is than used for making Mosquito nets used in residential/commercial and other establishments. Our galvanized wires are also used for re drawing. Lately we are having problem with the galvanized/processed wire that it gets rusted too soon.The chemicals we use are:-Zinc Sulphate, Boric Acid, Aluminum Sulphate, Zinc(Metal slab) and water(ph8 or over) brackish sub soil. Please advise us if how we can overcome the problem of RUST which is very severe as the climate is very damp and the humidity is also high. The facility is also near salty air blowing from the sea which is nearby. Thanking you in anticipation for your kind cooperation. Mohammad Ali.

Mohammad Ali
- Karachi, Pakistan
2000

---

The more severe the service condition, the more zinc you need to apply. How thick is your present coating? How soon is too soon? Are you having the same problem with mosquito netting and your drawn wire? Regards, Tom

  
Tom Pullizzi
Falls Township, Pennsylvania
2000

First red rust or white rust ? Rinse the neutralize the surface with alkalis.

I recommend a final rinse with a paraffin based finish wax.

Make sure that downcoiled wire is absolutely dry. Make sure fumes from acid bearing tanks can not circulate back on to finished wire even through open windows, etc.

Rich Weir
- Norwich, Connecticut, USA
2002