Published for Firgee Engineering
In order for us to solve corrosion issue occured around our daily life, one of the best option is to use galvanisation technique for corrosion prevention. Galvanisation (galvanization) may be refer to the process of which a layer of zinc is applied to the surface of steel by hot dipping. In the atmosphere and most aqueous environments, zinc is anodic to and will thus cathodically protect the steel if there is any surface damage. Any corrosion of the zinc coating will proceed at an extremely slow rate because the ratio of the anode to cathode surface area is quite large .
Economic Benefit of Galvanisation
According to National Association of Corrosion Engineers, NACE, based on U.S Federal Highway Administration research on corrosion cost study conducted in 2002 (latest), it was revealed around 3% of national Gross Domestic Prodcut, GDP may be spend to fix corrosion issues annually 
Therefore, in our case, Malaysia have to spend at least MYR 40 billion (approximately) to tackle corrosion issues across multiple sectors annually! This amount is so huge. It may also be equated to the bulding cost of 6 Petronas Twin Towers!
The Benefit of Hot Dip Galvanisation
Based on table below, it may improved corrosion resistance. Indirectly, it will prolong your assest integrity and ultimately reducing your capital expenditure (CAPEX) annualy.
Hot Dip Galvanisation Process
The process may be segregated into 2 distinct process  such as follows:
In our article, we would like to concentrate more into continuous process where Firgee Engineering is offering its expertise to their respective client. This process typically involve 8 steps such as below:
- Is a cleaning process to remove adherent substances and contaminants which hindering zinc from sticking onto the substrate.
- To remove residue and make the substrate perfectly free from any leftover.
- To dissolve any remaining oxides
- Rinsing (2nd)
- To prepare surfaces for metallurgical phase by applying a saline layer that facilitates iron zinc bonding
- Zinc bathing (immersion)
- Immersing substrate into a pool fill with zinc
- To retard metallorgraphy changes
The thickness of galvanisation will depends on its usability. It does varies according to respective indutry. For instance, oil & gas sector particularly exploration stage will require a wire rod with its rope thickness fall somewhere between 30-40 micrometer . This will ensure the rod from corroded within its design life when exposed to harsh seawater environment.
In general, the coating microstructure consists of the substrate, the interfacial alloy layer, and the overlay cast structure. Depending on the type of coating, the microstructure and composition of these constituents’ changes.
Generally for our consideration, delta layer is the most desired layer to enhance the integrity of galvanisation.