Surface World Handbook 2017 - Page 171

WEDGE GROUP GALVANIZING What is Galvanizing? How does galvanizing work? Hot-dip galvanizing is the practise of coating steel with a layer of molten zinc to provide a lasting and durable surface that protects steel from rust and corrosion. So what does the initial process entail? To begin with, the steel must be cleaned to remove light grease, scale or dirt – which would ultimately cause the process to fail – then the component is rinsed, dipped in hydrochloric acid, rinsed again, and dipped once more in a flux solution to remove the very last traces of oxide from the surface. What’s next? cools to show the bright, shiny appearance generally associated with galvanized products. The whole process can take just a few hours and the results really do last decades. If you’d like to know more about the galvanizing process, do get in touch with the Wedge Group Galvanizing team on 01902 630311 or visit www.wedge-galv.co.uk. After the steel has dried, it’s dipped into a bath of molten zinc at a temperature of around 450oC, which is when a series of zinc-iron layers are formed that act as a barrier against moisture and oxygen. The component is then immersed in water to cool, or allowed to cool naturally. What’s the result? Typically, items will be dipped for four to five minutes, and when they’re removed a layer of pure molten zinc will be taken out on top of the alloy. It’s this layer that twitter: @surfaceworldmag 2017 - 2018 169