What’s The Difference Between Pre-Gal And Hot-Dip Galvanising?
Pre-galvanising and hot-dip galvanising are both processes used to coat steel or iron with a layer of zinc to protect it from corrosion. The main difference between the two lies in the method of applying the zinc coating:
- Pre-galvanising: In this process, the steel or iron is coated with a layer of zinc before it is formed into its final shape. The material is passed through a zinc bath, where it is coated with a thin layer of zinc. This coating provides corrosion protection to the material, especially at exposed edges and areas where the coating may be damaged during forming or fabrication.
- Hot-dip galvanising: This process involves immersing the steel or iron in a bath of molten zinc after it has been formed into its final shape. The material is cleaned to remove any contaminants, then dipped into the zinc bath, where the zinc adheres to its surface. The zinc coating formed through hot-dip galvanizing is typically thicker and more durable compared to pre-galvanised coatings.
In summary, pre-galvanising applies the zinc coating before forming the material, while hot-dip galvanising applies the coating after forming. Hot-dip galvanising generally provides a thicker and more robust zinc coating, making it suitable for more demanding applications where corrosion resistance is crucial.
Hot-Dip Galvanizing
