Very thick coatings may form on items that are large and consist of heavy steel sections. Longer immersion and handling times required to process these sections may result in the metallurgical properties of the steel having high reactivity with the zinc whilst in the galvanizing bath.
There are a number of factors to take in consideration when galvanizing large or thick steel sections that can have an effect on the surface condition of the end product.
- Steel Thickness
When immersing ferrous articles into the zinc bath the material reacts with the molten zinc and metallurgical starts the bonding process. However thick steel articles require longer immersion times which in most cases will result in a thicker dull coating of zinc present over the steel surface.
- Larger Items
Pending shape, size and thickness of any large articles and what other materials are fabricated with it, this will also have a similar effect to thick steel articles often producing dull thicker coatings and possible distortion issues due to immersion times.
- Metallurgical Properties
Ferrous articles become very reactive in molten zinc that fall outside the recommend levels of phosphorous and silicone. This often attracts more zinc to the steels surface which can lead to a number of different surface conditions from delamination, striations, to very rough coatings.