Differences between pre-galvanized and hot-dip galvanized pipes

Hot-dip galvanized pipes and pre-galvanized pipes are two types of galvanized pipes commonly used in the construction and manufacturing industries. Although they look identical, they have some significant differences that buyers and manufacturers should take into account.
Hot-dip Galvanized Pipes
Hot-dip galvanization entails dipping the steel pipe into a molten bath of zinc at a temperature of around 450°C. This process produces a thick layer of zinc coating on the surface of the steel pipe, which offers long-lasting protection from corrosion and rust. The method is popular because it guarantees an even and durable coating that can last for up to 50 years.
Pre-galvanized Pipes
Pre-galvanization involves mild electrolysis of steel pipes and then dipping them in a molten zinc solution. It coats the surface of the steel pipes with a thinner layer of zinc that provides less protection against rust and corrosion. The process is less time-consuming and less expensive. The pipes that undergo this process are ideal for indoor applications or areas with low exposure to corrosion.
Comparing Hot-dip Galvanized and Pre-galvanized pipes
The primary distinction between hot-dip and pre-galvanized pipes is the thickness of the zinc coating on the steel pipes. Hot-dip galvanized pipes have more robust zinc coatings, making them more expensive than pre-galvanized pipes. However, they offer reliable protection against rust and other types of corrosion, making them ideal for outdoor applications, especially in industrial and harsh environments.
In contrast, pre-galvanized pipes are thin, have a more delicate coating than hot-dip pipes, and, therefore, are cheaper. They are perfect for indoor applications or areas with low exposure to environmental hazards.
Conclusion
In summary, the choice between hot-dip and pre-galvanized pipes will depend on the application, life span requirement, environmental exposure, and budget.