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3. Galvanizing wires
Wire galvanizing is an intermediate process between hot-dip galvanizing and sheet galvanizing. In fact, it is a continuous process that may include a heat treatment in a pass-through furnace or a lead bath at 500°C (patenting), depending on the wire's characteristics, followed by a pickling-fluxing treatment before entry into the zinc bath (generally pure). Excess zinc is wiped off as it exits the bath, either by passing through a gravel box where H 2 S burns, or by gas-jet dewatering.
The wires are processed in layers, i.e. around twenty bobbins are unwound and processed in parallel.
Wires are either bright (galvanized in the cold-drawn state) or annealed (galvanized after in-line annealing).
For certain applications, the wires are rewired after galvanizing, which requires...
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Galvanizing wires
By-products
Economic data
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Annual world zinc production is 9 Mt, of which more than 50% is devoted to steel production (growth of around 3% per year).
There are 550 continuous galvanizing lines worldwide, producing 70 Mt of coated steel.
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In Europe, automotive consumption will reach 8 Mt in 2005.
In Europe, 1.7 Mt/year...
Bibliography
- - Voir Recueils des Présentations aux Congrès Galvatech de 1989 (Tokyo), 1992 (Amsterdam), 1995 (Chicago), 1998 (Tokyo), 2001 (Bruxelles), 2004 (Chicago) et Intergalva : http://www.egga.com
- COUTSOURADIS (D.) -...
Theses
- - http://www.sudoc.abes.fr
- AMANI (S.) - Étude par électrochimie et par émission acoustique du décollement de couches de galvanisation sous protection cathodique - . Metz 2000.
- ...
Standardization
Tables A and B give the minimum weights and coating thicknesses according to NF EN ISO 1461, and the corrosion categories according to NF ISO 14713.
Organizations
Centre Français de l'Anticorrosion (CEFRACOR) : http://www.cefracor.org
European Galvanizers Association (EGGA) : http://www.egga.com
Galvazinc Association : http://www.galvazinc.com
...Manufacturers. Manufacturers
See the sites : http://www.galvazinc.frhttp://www.iza.comhttp://www.egga.com
Main zinc suppliers :
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