Hot-Dip Galvanizing Process in 3 Steps

HOT-DIP GALVANIZING is the most used process of coating iron or steel with a protective layer of zinc. It provides a tough, metallurgically bonded zinc coating that completely covers the steel and prevents it from corrosion. The galvanizing reaction only occurs on a chemically clean surface. Clean steel is dipped into molten zinc at a temperature of around 842 °F (450 °C), then it is covered with a robust coating which is formed by the reaction between the iron and zinc.

Hot-dip galvanizing process consists of three basic steps:

• Surface Preparation

• Galvanizing

• Inspection

Surface Preparation

Surface preparation is the most important step in the application of the cover because incorrect cleaning of the surface is the cause of a coating failure.

Galvanizing

After cooling process, the zinc coating is metallurgically bonded to the steel.

Inspection

In the end, a variety of simple physical and laboratory test is performed to determine the thickness of the steel.

Surface preparation is the most important step in the application of the cover because incorrect cleaning of the surface is the cause of a coating failure. Degreasing, Pickling, and Flux Solution include the Surface Preparation procedure. This process starts with the cleaning of the surface from all rust, dirt, grease, oil, and mill scale. Rust is removed by pickling the steel in the heated sulfuric acid. Fluxing is the final step of the surface preparation. The dipping of the steel in flux tank removes oxides. Flux can be applied in wet or dry ways. In the dry galvanizing process, the material is dried before the immersion in molten zinc. A layer of liquid zinc ammonium chloride is floated on the top of the bath of molten zinc in the wet galvanization. The steel is removed from the bath and left to cool in a quench tank.

After cooling process, the zinc coating is metallurgically bonded to the steel. Spangle is the crystallized pattern which appeared on the surface of the steel after galvanizing. In the end, a variety of simple physical and laboratory test is performed to determine the thickness of the steel. It is one of the most important components in detecting the quality of a galvanized coating. The uniformity, adherence, and appearance should also be checked. The performance of the galvanized coverings has been proved under numerous environmental conditions, extreme hot and cold temperatures. Hot-Dip Galvanizing may protect the steel from corrosion for up to 50 years.

Galvanized coatings protect steel in three ways:

Firstly, galvanize coating weathers at a very slow rate giving a long and predictable life.

Secondly, the coating corrodes preferentially to provide cathodic (sacrificial) protection to any small areas of steel exposed through drilling, cutting or accidental damage; scratches are sealed by weathering products from the zinc.

Thirdly, if the damaged area is larger, the sacrificial protection prevents the sideways creep of rust which can undermine paint coatings.

Hot Dip Galvanizing Equipment Chinese Manufacturer

The base material of hot dip galvanizing is zinc. Zinc is naturally present in air, water and soil. Zinc plating can protect the material covered under normal conditions for up to 40 years. Hot dip galvanizing is durable, durable, economical and recyclable.

Hot dip galvanizing equipment aims to make full use of the galvanizing process. The resettlement plan will be determined according to the construction of the facility, the implementation of the project and the construction area of the facility.

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