When products are dipped by the Hot-Dipped Galvanizing process, Zinc coated on steel products will prevent rust (Fe2O2H2O) and corrosion. Zinc is formed as an oxide (O2) through the air which composes of carbon dioxide (CO2). Then, the oxide will be more stable in terms of Zn (CO2) 2 but it takes at least 48 hours for the formation.
In fact, galvanizing is hot-dipped galvanizing but people generally called Galvanized. It has a thickness about 65 – 300 microns (depending on customer requirements and other hot dip conditions). This method is often used for outdoor protection, which is decomposition about 1 micron per year (lifetime is over 20 years).
In general, steelwork is about a design and welding job. Hot-dipped galvanized coatings can be classified by types of structure as following;
Large structural work consists mainly of pipe bending and large welding assembly
, No pipe on a workpiece and using other steel parts instead
, The use of pipes and steel products together.
, Cast iron
, Small work using screw and nut
Rust protection is commonly applied by coating steel products because it is cheaper and more convenient. So, Hot-Dip Galvanizing is the best choice because of the price and longer life than all kinds of coatings. Due to its quality, as a result, the trend of Hot-Dip Galvanizing continuously increase.