What is Hot Dip Galvanising
Updated: Jun 1, 2020
Most people would have a concept of galvanising – a steel finish that has a silver or dull and mottled grey appearance on it that you would typically see on metal bins, garden gates or fences around old Australian, old clothes line or street light poles to stop if from going rusty.
So, what is Galvanising?
Hot-dip galvanising is the best protective coating solution available for steel-based materials to protect it corrosion (rust) and with the lowest overall cost and longest time to first maintenance.
Hot Dip Galvanising is a tried and tested technique. Hot dip galvanising dates back to over 270 years. It was in 1742 that French chemist, Melouin, who recorded a process of dipping iron into molten zinc in order to create a zinc coating. The actual term, “galvanising” wasn’t coined to this specific process of coating steel until 1837. Credit for this goes to French engineer, Stanislas Sorel, who filed a patent on 10 of May, 1837 for a "galvanic" method of protecting iron from rust by either coating it in a bath of molten zinc or by covering it with galvanic paint.
Mine the zinc.
Get a few 1 tonne zinc ingots.
Get a big kettle.
Add the zinc and heat the kettle up to 450°C.
Why Hot Dip Galvanise?
The main purpose of galvanizing is to protect steel from corrosion. This means longer durability and life whilst protecting the asset at the lowest overall cost.
When dipped in a bath of molten zinc at a nominal operating temperature of 450°C, the steel reacts with the zinc creating an alloy that metallurgically bonds to the surface of the steel. Layers of zinc then form on top, providing a tough, abrasion-resistant coating.
Layers of zinc / iron alloy and based steel.
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