Hot Dipped Galvanized—New Anti-Corrosion Technology

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Hot dipped galvanized is a key means of preventing corrosion by immersing metal parts in a molten zinc solution, resulting in a metallurgical chemical reaction between steel and zinc, which in turn produces a stable zinc coating on the surface of the steel.

This technology has attracted wide attention due to its remarkable anti-corrosion properties, excellent processing capacity and wide range of applications.

What is Hot Dipped Galvanized Steel?

Hot Dip Galvanizing Process

Hot dip galvanizing is to immerse the pre-treated steel in a pure molten zinc metal bath, alloying zinc and iron to form a zinc-iron alloy layer.

The hot dip galvanizing process covers three core links:

  • Preparation: The chemical reaction of galvanizing is carried out only on a clean surface that has been chemically treated to remove contaminants from it. First, the metal is degreased with a caustic soda solution, then soaked in hydrochloric acid to remove rust, oxide, welding residue, paint, and oil. Next, it needs to be cleaned and soaked in a solution of flux, which is usually composed of about 30% zinc ammonium chloride.
  • Galvanizing: When clean steel parts are immersed in molten zinc (842°F (450°C), an alloy layer of zinc and iron is formed due to the metallurgical interaction of iron and zinc. When the material is pulled out of the galvanizing tank, the tip of the alloy layer forms a layer of melted zinc.
  • Inspection: Determine the thickness, uniformity, adhesion and appearance of the zinc coating, and perform various basic physical tests and laboratory experiments.

Advantages of Hot Dip Galvanized

Hot dip galvanizing has many advantages, such as:

  • Good adhesion and uniformity: In the process of hot dip galvanizing, the zinc liquid can penetrate deeply into the small pores on the surface of the steel, thereby establishing a compact chemical bond. At the same time, the zinc material is distributed very evenly in the skin of the steel, and there is no thickness change, which ensures that the anti-corrosion effect is all-round and uniform.
  • Excellent anti-corrosion effect: Galvanized steel acts as a barrier between the steel and its surroundings. Avoid contact with water, wind, salt, debris and other substances that may cause damage to the steel.
  • Long service life and no maintenance: No annual spraying, recoating or other additional operations required.
  • Enhanced surface wear resistance: Hot drop galvanizing exhibits excellent wear resistance, even when subjected to scratches or gouges, it can still effectively resist corrosion.
  • Recycling: Adapted to the circular economy, zinc and steel are recycled for continuous use.

Hot Dipped Galvanized vs Galvanized Steel, How to Choose?

Performance Differences between Hot Dipped Galvanized and Galvanized Steel

There are some significant differences in performance between the two just-treated methods of hot-dip galvanizing and galvanized steel:


Hot Dipped Galvanized


Coating Thickness

Thick coating for heavy-duty use

Thinner coating for general use


Immersion in molten zinc

Electrolyte solution and electric current


Heavy-duty applications, e.g., construction, marine

General uses, e.g., household items, outdoor structures

Corrosion Resistance

High resistance in demanding environments

Adequate protection for less harsh conditions


Potentially higher due to thicker coating

Generally more cost-effective

Hot Dipped Galvanized and Galvanized

The main difference between galvanizing and hot dipped galvanized is that the surface of the former galvanizing material is smoother and sharper, while the structure of the latter shows a rougher surface treatment.

In addition, the step of galvanizing involves the generation of a layer of zinc to prevent the metal from being corroded, and the coating thickness is usually 10 to 12 microns, while hot dip galvanizing involves the treatment of the metal surface, galvanizing, and forming a pure zinc layer on the metal.

hot dipped galvanized

Hot Dipped Galvanized Conclusion

In summary, many industries have the wide application of hot dipped galvanized technology, excellent anti-corrosion ability and excellent processability, making it the preferred anti-corrosion measure for most industries.

The galvanized steel products supplied by TUSPIPE are made of high-quality materials and are produced in strict accordance with international standards such AS ASTM (A500, A53 and A513) AS/NZ 1163, JIS G3444 and EN 10219Click here to watch a video of TUSPIPE steel pipe production.


1. Is hot dipped galvanized better than stainless steel?

Which is stronger, galvanized steel or stainless steel? When comparing similar thicknesses and shapes, stainless steel is always stronger than galvanized steel. An effective way to compare this is to look at the tensile strength of each material. Tensile strength is the ability of a material to resist failure under tension.

2. Is hot dipped galvanized good for outdoor use?

The significant advantages of hot dip galvanizing are the thick coating, excellent corrosion resistance and the sacrificial protection of zinc coating. The product produced by this process has excellent durability and is able to operate stably in all outdoor weather conditions.

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