Galvanizing

All products are available with a self colour finish for on site fabrication or galvanzied to BS EN ISO1461 - 2009.  Galvanizing takes place at Birtley Building Products who are another member of Hill & Smith Holdings PLC, keeping this process withing our group ensures we maintain a high standard of product quality and customer service.

 

preperation

The galvanizing reaction will only occur on a chemically clean surface.Therefore most of the preparation work is done with this objective in mind. In common with most coating processes the secret to achieving a good quality coating lies in the preparation of the surface of the iron or steel. It is essential that this is free of grease, dirt and scale before galvanizing.These types of contamination are removed by a variety of processes. Common practice is to degrease using an alkaline or acid degreasing solution into which the component is dipped.

The article is then rinsed in cold water and then dipped in hydrochloric acid at ambient temperature to remove rust and mill scale.  Welding slag, paint and heavy grease will not be removed by the above cleaning steps and should be removed before the work is sent to the galvanizer.

After a further rinsing operation, the components will then commonly undergo a fluxing procedure.This is normally applied by dipping in a flux solution - usually about 30% zinc ammonium chloride at aroun 65-80ºC.The fluxing operation removes any of the last traces of oxide from the surface of the component and allows the molten zinc to wet the steel.

 

Galvanizing

Any zinc that does not form a coating on the metal remains in the bath for further re-use.  Galvanizing residues are recovered and zinc recycled for further use. 

As well as zinc recovered from these residues, recycled zinc from other sources, such as zinc scrap, is often used in galvanizing.  Galvanized steel can be recycled easily with other steel scrap in the steel production process.

Improvements in gas burning technology have also greatly improved energy efficiency in heating the galvanizing bath. Exhaust heat is not wasted and is used to heat pre-treatment chemicals or dry work prior to emmersion.

The galvanizing industry is committed to understanding and improving the life-cycle environmental performance of its process and products.  Galvanizers Association has recently helped establish a Pan-European Life Cycle Inventory database for general galvanizing.This LCI data will allow Environmental Product Declarations and other life cycle assessments to be made on structures involving galvanized steel.

 

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Gavanized Flooring

 

Galvanized Stanchions 2