What’s the Difference Between Galvanizing and Epoxy Coating?

When it comes to anti-corrosion coatings to protect metal pipes, galvanized and epoxy coatings often come up as the solution. But what's the difference between the two? Let's explore this issue in more detail.

Galvanizing:

Galvanizing can be divided into hot-dip galvanizing and pre-galvanizing (also known as the mill galvanization). Typically used in outdoor applications because it is highly resistant to environmental factors such as water, salt water, heat, and chemicals. Additionally, galvanized materials last up to five times longer than traditional paint coatings. On the other hand, it is not suitable for use on surfaces that are exposed to direct sunlight for long periods of time, as zinc corrodes over time.

Epoxy Coating:

Epoxy is the name for a polymer made from the monomer ethylene oxide, whose chemical composition and structure allow it to bond with other materials so that it can act as a coating material. Epoxy coatings provide a thin film layer that prevents rust or corrosion. It is typically used in indoor environments, such as machine shops or warehouses, where there is no exposure to UV rays or other environmental factors. It also has excellent chemical resistance, so it won't wear out when exposed to certain materials like oil or solvents. However, it does not provide protection from scratches or physical impact, so if your metal surface sees frequent use, an epoxy coating may not be suitable.

Difference Between Galvanizing and Epoxy Coating:

The main difference between galvanizing and epoxy coating is that galvanizing involves dipping steel or iron in molten zinc, while epoxy coating is a spraying process that uses an electrostatic gun to apply protective material to the metal surface. While both processes provide a protective layer, they are used in different applications and each has advantages and disadvantages.

- Epoxy paint is a two-part paint: resin and hardener.

- Galvanizing is the process of coating the surface of steel or iron with a layer of zinc to protect it from corrosion.

- Epoxy coatings are generally more expensive than galvanizing, but they provide superior protection against corrosion.

- Galvanized coatings are more likely to chip and peel over time, while epoxy coatings are more resistant to chipping and peeling.

- Epoxy coatings can be applied to ferrous and non-ferrous metals, while galvanizing can only be used on ferrous metals.

- Epoxy coatings generally have a longer lifespan than galvanized coatings, but both types of coatings will eventually need to be replaced.

Conclusion:

Deciding whether to use galvanized or epoxy coating depends on your specific application needs. If you want to know more about pipeline anticorrosion, you can contact Union Steel Industry - China professional coated steel pipe manufacturer.