Introduction

Galvanization is a most effective way to protect steel from corrosion. The zinc layer of galvanized steel,can enhance the ability of anti-rust and anti-corrosion. But not all the galvanized steel is the same. The main two types of galvanization are pre-galvanized and hot-dip galvanized steel. When you choose material for projects, the first thing is to understand the differences between them. In this introduction, we will compare pre-galvanized and hot-dip galvanized steel, to know their main differences , applications and advantages.

Pre-galvanized steel adds a layer of thin zinc before the final products. Galvanized steel adds a layer of thick zinc after the final products, to enhance the anti-corrosion ability. Galvanized steel is more suitable to the higher demand applications because of this difference.

Now we have known the basic difference between. Next, we will deeply to learn their processes, advantages, durability, Cost, and applicability.

What is Pre-Galvanization?

Pre-galvanization is the process of painting zinc on steel plate or coil material before they have been cut to be the final products.In the early stages of the production process, a galvanized layer is applied to the steel by passing it through a hot-dip galvanizing bath. So, compare to the galvanized steel, pre-galvanized steel’s zinc layer is thinner, and zinc layer on the cutting edge is worse than other parts. Pre-galvanization steel is always used in the products making from steel plates, such as fence material, aire ducts and other construction material.

What is Galvanization?

Galvanization or hot dipped galvanizing is a process of dipping the steel in the molten zinc after the final products. Compare to the pre-galvanization, this kind of products have thicker and more durable zinc layer. Hot-dip galvanized steel’s corrosion Resistance is better, especially in the outdoor or exposed in the wet air. The zinc layer of hot-dip galvanized steel is integral, including the cutting edge, which can ensure the the entire material has consistent corrosion resistance. Because of these advantages,  Hot-dip galvanized steel’s a best choice of outdoor construction, structural components and fences.

Pre-Galvanized vs Galvanized: Key Differences

The main differences between pre-galvanized and galvanized steel are the zinc layer’s thickness and the process of galvanization.

• The zinc coating of pre-galvanizedis thinner. And because of its produce process, that coating before final products, it is not very durable in wet air and other harsh environment.
• On the other hand, galvanized steelcoated zinc after the final shape, that make it has thicker zinc layer and have stronger protect.

According to the key difference, galvanized steel is the best choice of long term durability and elasticity to components.

Applications of Pre-Galvanized Steel

Pre-galvanized steel has its own advantage, its lower cost and suitable for indoor applications, make it popular too, such as:

• Structural componentsin buildings
• Automotivecomponents that don’t need to use in the natural condition
• Fences and barriers in good condition which can be controlled
• Household Electric Appliances, such as washer and conditioner

So, the pre-galvanized steel can provide anti corrosion protection. But if you want the products have higher ability, pre-galvanized steel’s thinner zinc coat maybe not strong enough.

Applications of Galvanized Steel

Galvanized steel is the best choice for outdoor construction and high corrosive environment. For example:

• Outdoor construction, such as bridges, buildings and towers
• Fences and gated that exposed in the natural environment
• Solar power frame that exposed in sunshine and natural environment for long time
• Agricultural equipment which stand the wet and chemicals.

The thick coating of zinc is very important, that can make the galvanized steel can be durable in harsh conditions, especially outdoors and heavy-duty applications.

Corrosion Resistance: Pre-Galvanized vs Galvanized

The other main consideration between pre-galvanized and galvanized steel is the corrosion resistance. Galvanized steel’s thick zinc coat can provide better anti-rust and anti-corrosion ability. That’s more important for the project in the wet and harsh condition.

By comparison, pre-galvanized has thinner zinc coat, so it’s corrosion resistance is lower, especially the cutting edge.Over time, pre-galvanized steel is easy to rust and  corrosion, particularly in outdoor and wet environment.

Cost Comparison: Pre-Galvanized vs Galvanized Steel

On the other hand, galvanized steel, with its thicker coating and superior corrosion resistance, tends to be more expensive. However, its longer lifespan and better durability in harsh environments can make it a more cost-effective choice in the long run for outdoor or high-exposure projects.

Because the produce process of pre-galvanized is simpler and less time and materials are needed in production so its cost is lower than galvanized steel. So under the conditions allowed by the usage environment, pre-galvanized steel is good choice.

On the other hand, galvanized steel has thicker zinc coating, can provide better corrosion resistance but cost more. However, if it is used in harsh condition, such as outdoors or under the strong sun, you can choose galvanized steel which has onger lifespan and better durability.

Summary

In summary, how to choose pre-galvanized and galvanized steel mainly depends on your need. If you have a indoor project without frequently exposed to water,  pre-galvanized is suitable. If you are working in a outdoor project, or in the harsh condition, galvanized steel has more corrosion-resistant and long-lasting durability.

Understand the two types of steel can help you to make a wiser decision.