• Galvanised Steel

Galvanising Process

Posted: 11th November 2014

The Galvanising process is a process used to protect steel from rust by applying a zinc coating to the steel. The zinc forms a barrier against corrosion in that the steel underneath does not come into contact with water or moisture in the air.

The process consists of 3 distinct phases:

1. Pre-Treatment
2. Galvanizing
3. Inspection

 

Pre-Treatment

Pre Treatment consists of 4 separate stages:


Galvanizing

The Item is then immersed in molten zinc at a temperature of around 450 degrees until the temperature of the item is the same as the zinc. During this process the molten zinc reacts with the surface of the steel to form a series of zinc/iron alloys. As the item is removed from the zinc, the zinc on its surface will begin to solidify, as this happens excess zinc is removed to ensure a smooth finish. The item is then usually transferred to a quench tank where it is cooled to allow handling.


Inspection

The galvanized steel is then visually inspected for its appearance and conformity to standards. Batches may then be non-destructively tested for coating thickness and uniformity.