Cold galvanizing is the application of a special zinc-containing composition to the prepared surface by means of methods used for conventional paints, as a result of which a coating with similar anti-corrosion properties is formed, as well as a coating obtained by hot galvanizing.
The protective effect of coatings obtained by cold galvanizing is based on two anti-corrosion effects:
- During zinc oxidation, a dense oxide layer is formed, which prevents further penetration of oxygen molecules and other oxidants to the protected surface.
- If the purpose is to protect the iron surface, then in case of violation of the integrity of the coating, iron will be protected electrochemically, since in the galvanic pair iron-zinc, zinc is the most active metal, and in aggressive conditions will be "consumed" first, protecting the main surface.
Thus, the coating obtained by cold galvanizing, after a certain time, depending on the operating conditions (mainly humidity), protects the same mechanism as the coating applied hot.
The possibility of applying the composition to the welds, as well as repainting damaged surfaces makes this method of protection of metals an excellent solution in many situations.
Zinc-containing primers series Eppex Zn for metal can be purchased in our catalog.