Tuesday, June 24, 2008

HOT DIP GALVANIZATION for Steel Structures

::: ::: :::: ::: ::: ::::: :::: ::: :::: :::

Unprotected Steel can be seriously damaged due to such environmental factors as rain & snow, wind, and extreme temperature .Corrosion transforms steel back to its natural state of iron, which is very fragile and can prove to be deadly in structures supporting heavy pressure (e.g. Towers).
Picture of Hot dip Galvanized pipes

The best way to avoid this phenomenon is through a process called "hot dip galvanization". This process consists of dipping steel in melted zinc at 450° Celsius, temperature at which iron and zinc share great affinity, and allowing an alloy to form where pure zinc prevails to the outside. The final product is a Steel surface protected with a zinc coating.

Hot-dip galvanized steel has been using in the industry for more than 150 years. The value of hot-dip galvanizing stems from the relative corrosion resistance of zinc, which, under most service conditions, is considerably better than iron and steel. In addition to forming a physical barrier against corrosion, zinc, applied as a hot-dip galvanized coating, cathodically protects exposed steel.

A Galavanization Plant

Steel strip can be hot-dip galvanized in a continuous line. Hot-dip galvanized steel strip (also sometimes loosely referred to as galvanized iron) is extensively used for applications requiring the strength of steel and resistance to corrosion.

Applications include: roofing and walling, safety barriers, handrails, consumer appliances and automotive body parts. One common use is in metal pails. They are also used in most heating and cooling duct systems in buildings

Galvanization progressing at a plant

::: ::: :::: ::: ::: ::::: :::: ::: :::: :::
See this PDF file from GORD telecom for more information. Also See American Galvanizers Association

No comments: