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Introduction of galvanized type

The two most popular forms of galvanizing are hot-dip galvanizing and electro-galvanizing. These two methods and others are discussed below. Knowing which type of galvanizing to choose may require the help of an expert

hot dip galvanized

During hot dip galvanizing, the metal is immersed in a hot zinc bath at about 450 °C. When it is removed, the coated surface reacts with oxygen to form zinc oxide, which then reacts with carbon dioxide to form zinc carbonate. Before galvanizing, the metal must be cleaned with a caustic solution and then pickled in an acid solution; zinc ammonium chloride can also be used to prevent premature oxidation of the metal prior to galvanizing

Electrogalvanized

Electrogalvanizing combines galvanizing with electroplating: an electric current is passed through a zinc bath with a zinc anode and a steel conductor. The process produces thinner coatings than hot dip galvanizing and also produces a brighter surface finish suitable for cosmetic applications

sherardizing

This form of galvanizing has several names: Sherardizing, Hot Diffusion Galvanizing, Steam Galvanizing, and Dry Galvanizing. It involves heating steel parts to 500°C in a closed rotating drum containing zinc powder. The evaporated zinc diffuses onto the surface of the steel to form a firmly bonded coating. It is ideal for small parts and parts that need to be coated on the inside

Galvanized

Galvanizing is a combination of hot drip galvanizing and annealing. The hot dip galvanizing process proceeds normally, before the coated metal is passed through an air knife to remove any excess zinc. The metal is then heated very briefly in an annealing furnace at 500–565 °C to interdiffuse the iron and zinc layers and form a zinc-iron alloy layer

The advantages of galvanizing

The purpose of galvanizing is to create a protective coating of zinc on steel or iron parts. But why is this useful? What are the main advantages of galvanizing?

Blocks Corrosive Substances: The zinc coating on galvanized metal prevents corrosive substances from reaching the weaker underlying substrate metal. This extends the life of the substrate, especially in demanding applications

Rust Prevention: Galvanizing significantly delays rusting

Creating a sacrificial anode: The zinc coating is consumed by corrosive substances, so it provides protection to the metal below until it is completely used up. Even if scratches penetrate the coating, the zinc will run out before the iron

Durable: The zinc coating formed by galvanizing is tough and long-lasting, often providing decades of protection to the underlying metal

Affordable: Galvanizing is a fairly simple and affordable procedure that offers significant benefits with minimal outlay

Forms thick coatings: Although not suitable for all applications, galvanizing produces thicker coatings than electroplating etc.

Application of galvanized

The ability to prevent corrosion in steel has made galvanizing widely used in multiple industries

The most common application is galvanized steel for construction: hundreds of thousands of tons of galvanized construction steel are produced annually to make structures such as building frames, street furniture, fire escapes, ladders and balconies

Galvanized steel is also common in the auto industry, where it can be made into rust-resistant parts, including most of a car's "body-in-white": its skeletal foundation. Bumpers, beams, frames and chassis can also be made of galvanized steel

Rust prevention is a desirable feature in the telecommunications industry, where telephone lines and electrical boxes are affected by these factors on a daily basis. Galvanizing helps extend the life of such items

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