Hot-dip galvanized (galvanizing), also known as hot-dip galvanized, is an effective anti-corrosion of the metal, mainly used in various sectors of the metal structure facilities.

The rusted steel immersed in liquid zinc melt around 500 ℃, and steel members are attached to the surface of the zinc layer, which plays the purpose of anti-corrosion.

Hot-dip galvanizing process

finished of Pickling - washing - plus help the bath - drying - hanging plating - cooling - Pharmaceutical - cleaning - polishing - completion of the hot-dip galvanizing, hot dip galvanized by the ancient method of hot-dipped development come since 1836, France had been used in industrial hot dip galvanized, has a history of 140 years. However, the hot-dip galvanizing industry in the past three decades along with the rapid development and large-scale development of the cold-rolled steel strip.

With the discovery of the industrial, hot dip galvanized products have been applied to many areas, hot-dip galvanized advantage of the anti-corrosion service life for a long time, to adapt to the antiseptic treatment method widely been very popular. Been widely used in power towers, communication towers, railways, road protection, light poles, marine components, construction steel structure components, substation ancillary facilities, and the light industry.

Principle of Hot-galvanized advantages

hot dip galvanized iron pieces cleaned, and then the solvent treatment, drying after immersion in liquid zinc, iron, and the reaction of molten zinc alloyed zinc layer, its processes: the skim - washing - pickling - the fluxing - drying - hot-dip galvanized - separation - cooling passivation.

Galvanizing alloy layer mainly depends on the thickness of the silicon content of the steel chemical composition, the rough degree of the size of the cross-sectional area of the steel surface of the steel, the temperature of the zinc pot, the zinc immersion time, the cooling speed, and the cold deformation.

Hot-galvanized advantages

• low-cost processing: hot-dip galvanized anti-rust is lower cost than the cost of another paint coating;

• Durable: standard hot dip galvanized rust thickness can be kept for 50 years or more in the rural environment, without having to patch; standard hot dip galvanized rust layer can be maintained for 20 years in the urban areas or offshore areas, without having to patch;

• good reliability: galvanized layer with steel is metallurgically bonded to become a part of the surface of the steel, and therefore more reliable coating persistent;

• the toughness of the coating: zinc coating forms a special metallurgical structure, this structure can withstand transportation and use of mechanical damage;

• full protective: plated parts each part can be plated with zinc, even in the recesses, sharp corners and hiding places can be fully protected;

• saving time and effort: the galvanizing process is faster than other coating construction methods and can avoid the brushing time required on site after installation.

Specification of hot dip galvanizing 

A hot-dip galvanized coating is relatively easier and cheaper to specify than an organic paint coating of equivalent corrosion protection performance. The British, European and International standard for hot-dip galvanizing is BS EN ISO 1461 which specifies a minimum coating thickness to be applied to steel in relation to the steels section thickness e.g. a steel fabrication with a section size thicker than 6 mm shall have a minimum galvanized coating thickness of 85 µm.

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