Hot Dip Galvanized Process

Our plant has the ability to galvanize parts of very different weight and sizes (from screws to certain structural elements). The surface preparation of the material to be galvanized is carried out chemically. The following diagram illustrates the main stages of our process.

Degreasing: 

A mild acidic bath removes organic contaminants such as dirt, grease, and oil from the metal surface. Epoxies, paints,  vinyls, asphalt, or welding slag, which cannot be removed by degreasing, must be removed before galvanizing by grit-blasting, sand-blasting,  or other mechanical means.

Pickling:

A dilute solution of ambient hydrochloric acid, removes mill scale and iron oxides (rust) from the steel surface. As an alternative to or in conjunction with pickling, this step can also be accomplished using abrasive cleaning or air blasting sand, metallic shot, or grit onto the steel.

Fluxing: 

The final surface preparation step in the galvanizing process, a zinc ammonium chloride solution, serves two purposes. It removes any remaining oxides and deposits a protective layer on the steel to prevent any further oxides from forming on the surface prior to immersion in the molten zinc.

Galvanizing:

After cleaning, the material to be coated is immersed in a bath of molten zinc at a temperature around 450 ° C. The thickness of the layer is proportional to the immersion time.

This is the final step of the process and here the products are visually checked to ensure the integrity of the coating, also the thickness of the layer is measured to verify that it is according to the standards.