What are the benefits of galvanizing?

Galvanizing refers to the surface treatment technology of plating a layer of zinc on the surface of metals, alloys or other materials to play the role of aesthetics and rust prevention. The main methods used are hot dip galvanizing and electric galvanizing

Principle of galvanization

In the galvanizing bath containing the galvanizing solution, the cleaned and specially pre-treated parts to be plated are used as the cathode and the anode is made from the plated metal, and the two poles are connected to the positive and negative poles of the DC power supply respectively. The galvanizing solution consists of an aqueous solution containing compounds of the coated metal, conductive salts, buffers, pH adjusters and additives. When energised, the metal ions in the galvanizing solution move to the cathode to form the coating under the action of potential difference.

Classification of galvanization

1. Cold galvanizing
2. Mechanical galvanizing
3. Hot-dip galvanizing
4. Electro galvanizing

Advantages：

1. Good corrosion resistance, fine and uniform combination, not easy to be corrosive gas or liquid into the interior.
2. Because the zinc layer is pure, it is not easy to be corroded under acid or alkali environment. Protect the steel body effectively for a long time.
3. After passivation by chromic acid to form a variety of colours to use, according to the customer's favorite selection, zinc plating beautiful and decorative.
4. zinc coating has good ductility, in a variety of bending, handling impact will not easily fall off.

Electro galvanizing  VS  Hot dip galvanizing

• Electro galvanizing has a thin zinc layer, hot-dip galvanizing has a thicker, more corrosion-resistant and better quality layer. Hot-dip galvanizing has the advantages of even coating, strong adhesion and long service life. The difference with electro-galvanizing is the thickness of the galvanizing layer, hot-dip galvanizing has a thicker zinc layer.
• Hot-dip galvanizing surfaces are darker and less lustrous, electro-galvanizing surfaces are brighter. The appearance of hot-dip galvanizing is not as delicate and bright as that of electro-galvanizing, but the thickness of the zinc layer is dozens of times greater than that of electro-galvanizing. Corrosion resistance is also better than electroplated zinc.