This is one of the most effective methods of corrosion protection.
Under this term is a set of operations aimed at covering the surface of steel objects with a thin coating of zinc for protection against the effects of water and air, that is, against the effects of corrosion. This method of corrosion protection is widely used in many industries, including. In the construction, agri-food, automotive, shipbuilding, aerospace industries.
Types of galvanizing
Types of galvanizing:
– hot-dip gal vanizing – the object is immersed in a liquid zinc bath,
– powder galvanizing – the object is held at a temperature of 350-400 °C for several hours in powdered zinc containing about 6% zinc oxide,
– spray galvanizing,
– electroplating.
Zinc-coated products, compared to steel products (without zinc coating), show several to several times greater resistance to corrosion (rust). This is because zinc is much more electronegative than iron, it will corrode first, and its corrosion products will slow further corrosion. When the integrity of the zinc coating is broken, it will continue to protect the base material from corrosion. Protectorization (electrochemical protection) is the name given to this phenomenon.
Advantages of galvanizing
Advantages:
– all hard-to-reach places are covered by a layer of zinc,
– high resistance and performance,
– protection against corrosion for decades without the need for repairs,
– maintaining an unchanged external appearance for a very long time.
