zinc coating

Advantages of the Hot Dip Galvanizing Process

A galvanized steel has a protective zinc coating. Such zinc coating has a lot of advantages and benefits of other processes used to give protection to steel. The galvanized coating improves the quality and durability of steel fittings, pipes, and other structures. Written below are some the advantages and benefits of the galvanization process:


1. Low Cost: The galvanizing process usually costs less compared to other coating methods for steel, it is because other methods are often labour intensive and the cost of labour is consistently increasing. The process of galvanizing requires less manual labour, therefore it’s not impacted by the increase of cost.


2. Long Life: This is the number one benefit of hot dip galvanizing. Galvanized steel fittings, pipes, and other structures will last for more than 50 years in many rural areas, and more than 25 years in urban areas and in coastal environments.


3. Toughness: The galvanized coating’s unique metallurgical composition makes it rugged and therefore capable of enduring damage during assembly, transport, and service. 


4. Low Maintenance Cost: Because galvanized steel is rugged and has a long life, lesser effort is required to maintain it. This is very beneficial for structures in remote areas that will be costly to reach and service.


5. Standardization: Hot-dip galvanizing is normally standardized so every steel product meets specific standards. This will allow for precise prediction of the performance and lifespan of galvanized steel fittings, pipes, and other steel products.


6. Automatic Protection For Damaged Areas: Because of the sacrificial protection of the zinc coating, even the small areas which were damaged and therefore exposed and vulnerable to oxidation is protected. 


Other coatings for steel like paint are not able to provide the same kind or protection, making exposed areas vulnerable to deterioration unless they are coated again. 


7. 360-Degree Protection: The method of galvanization could protect each part of a certain steel product — every corner, recess, nook, or cranny. This total protection can’t be provided by other types of steel coatings.


8. Easy Inspection: Inspecting galvanized steel products is very simple. Zinc coatings could be checked visually and the thickness could be tested with simple, non-destructive process. If the coating looks intact, it is intact.  


9. Fast Assembly. Once galvanized steel products are manufactured, they are ready to be used. There is no need to prepare, inspect or paint the surface of the coating. After the structure has been erected, you could immediately move on to the next stage.


If you’re looking for high quality galvanized steel online, visit tcg industries WA by following the hyperlink provided, or you can click here if you want to know more about hot-dip galvanizing. 

Why Choose Hot Dipped Galvanising For Steel Products?

Hot-dipped galvanization provides a cathodic zinc protective coating to steel from rust. Structural steel put through such process goes through a series of chemical cleaning steps that lead up to the very last step of being fully submerged in an 830-Fahrenheit bath of molten zinc. The viscosity properties of zinc and heat effect on the zinc, cleaning solutions, as well as the metallic zinc coating, require specific design guidelines be observed to make sure that the steel after the galvanising process precisely performs as the engineer intends it to.

The Hot-Dip Galvanising Process

Hot-dipped galvanizing is a factory-controlled process where mildly strong or very strong steel is cleaned progressively in caustic, acid (sulfuric or hydrochloric) and flux solutions before it is immersed in a bath of 830 Fahrenheit of molten zinc. Because of a metallurgical reaction, the molten zinc provides a nice coat on steel. Such zinc finish has 4 layers, three layers are zinc alloy, and the 4th is a top layer of pure zinc. A tight adherent, abrasion-resistant coat is formed as a result of this reaction. In fact, the three layers of zinc alloy are a lot harder than the steel itself and have a bond to the steel of an estimated 3,600 psi, making a tough finish, very difficult to damage when erected and when exposed to tear and harsh climate conditions. Typical steel coatings are in excess of four mils, but this vary depending on the steel’s thickness and type. Unlike many steel coatings where there’s a specific thickness, the engineer must provide minimum thickness, depending on what coating specification is utilized.

How Zinc Protects the Steel

A zinc finish is metallic, therefore there’s no way moisture can penetrate it. The zinc coating serves as a barrier. It isolates the steel from electrolyte solutions like water, dew, salt water, and rain. The zinc finish that’s exposed to the air will sacrificially corrode before any of the steel it’s protecting will corrode. This includes when scratches happen when steel products are erected.

Zinc’s rate of corrosion in most conditions is very low, meaning the hot dipped galvanised coating will protect the steel from rusting for 75 long years or more. In the zinc corrosion process, the zinc coat progressively forms a luster of zinc carbonate, zinc oxide, and zinc hydroxide. The carbonate luster is tightly bound to the zinc underneath, slow to react to the damaging elements present in the air, and is not soluble in water.

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