WHAT IS GALVANIZING COATING?

What Is Galvanizing Coating?

Galvanizing Coating is the most commonly used method of protecting metal from corrosion. This involves applying a thin layer of zinc to the thick base metal, which protects it from the surrounding environment. The next time you are in your car, take a look at the road signs and lamp posts you have passed. A large number of them will have a pale, silvery color. That "silver" is actually a zinc coating. 

Why Galvanize coating?

Quite simply, galvanizing Coating the metal gives it anti-corrosion properties. Without a protective zinc coating, the metal will remain in contact with the components and will potentially deteriorate to oxidation and more rapidly. Galvanized Coating steel is a cost-effective alternative to using materials such as austenitic stainless steel or aluminum to prevent rust. 

How Does It Work?

Galvanizing Coating can protect metal in many ways. First, it forms a protective coating that protects the metal from the surrounding environment. The zinc layer prevents water and moisture and other elements in the air from deteriorating under the steel. The zinc coating should be scratched deep enough, the metal will be exposed and rust sensitive. 

Galvanizing Coating can also protect the metal through a process called “galvanic corrosion”. Galvanic corrosion occurs when two metals of different electrochemical makeup are placed in contact with each other in the presence of an electrolyte, such as salt water. According to the atomic structure of two metals, one is the metal anode and the other is the cathode. The anode dries faster than itself and the cathode dries more slowly than itself. The reason for using zinc for galvanizing Coating is that it contains anodes when in contact with many different types of metals. Since zinc coating is usually the anode in contact with the base metal, it reduces the corrosion of the base metal or cathode.

Different Methods of Galvanizing Coating

There are several different processes for galvanizing Coating metals: 

Hot-Dip Galvanizing Coating 

As the name implies, this method involves immersing the base metal in a molten pool of zinc. First of all, the base metal must be cleaned either mechanically, chemically or both so that a quality bond can be formed between the base metal and the zinc coating. Once cleaned, the base metal is fluxed so that it is free from any residual oxides that remain after the cleaning process. The base metal is then immersed in a hot bath of heated zinc and a metal bond is formed.

The advantages of this method are that it is economical; This can be done in quick and complex shapes. However, the final coating may be inconsistent compared to other galvanizing Coating processes.

Pre-galvanizing Coating

This method is similar to hot-dip galvanizing Coating but is performed in steel mills, usually on materials of a certain size already. Pre-galvanizing Coating involves rolling in a hot-dip galvanizing Coating process through a cleaning process such as metal sheets. The metal is then heated, the liquid passes through a pool of zinc and then returns. 

One advantage of this method is that large coils of steel-sheet can be galvanized faster with a more uniform coating than hot-dip galvanizing Coating. One disadvantage is that once galvanized metal production begins, exposed, uncoated areas will be present. This means that when a long roll of sheet is cut into smaller sizes, the edges where the metal is cut are left open.

Electro galvanizing Coating

Unlike the previous process, electro galvanizing Coating does not use molten baths of zinc. Instead, this process uses an electric current in an electrolyte solution to transfer zinc ions to the base metal. This involves electrically reducing the positively charged zinc ion into a zinc metal which is then deposited on a positively charged material. Grain refiners can also be added that help ensure a smooth zinc coating on the steel. Similar to the pre-galvanizing Coating process, electro galvanizing Coating is usually applied continuously to a sheet metal roll. 

Some of the advantages of this process are uniform coating and precise coating thickness. However, the coating is usually thinner than the zinc coating obtained by the hot-dip galvanizing Coating method which may reduce corrosion protection. 

A common method to apply this paint is hot-dip galvanization. But, Protexion offers galvanizing cold coating, there is no need to hot-dip galvaniZe. Just open the tin and apply like conventional paint after proper cleaning of the substrate. Galvanizing can be found in almost every major application and industry where iron or mild steel is used.

Having a metal galvanized provides it with anti-corrosion properties. Without using protective zinc coating, metal would remain exposed to the different elements and oxidize as well as corrode quickly. More information about  then Visit - http://www.protexion.in/cold-galvanizing-coating.php