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Galvanizing, also known as hot dipping and galvanizing, is an effective way to protect metals from corrosion and is mainly used for metal structure facilities in various industries. Hot dip galvanizing is developed by the older hot dip method, since 1836 France to hot dip galvanizing applied to industry, has a history of more than one hundred and seventy years. In the past thirty years, with the rapid development of cold rolled strip steel, hot dip galvanizing industry has developed on a large scale.
It is to immerse the rusty steel parts in the molten zinc solution at about 500℃, so that the surface of the steel parts is attached with zinc layer, so as to play an anti-corrosion role.
Galvanized layer formation process
Galvanized layer formation process is the most out of pure iron substrate and formed between the zinc layer of iron, zinc alloy, the process of workpiece surface formed in hot dip plating of iron - zinc alloy layer, and makes good combination between iron and pure zinc layer, the process can be simply described as follows: when the blacksmith a immersed in molten zinc liquid, zinc first formed in the interface and alpha (heart) solid solution. This is a crystal formed by melting zinc atoms in the solid state of the base metal iron. The atoms of the two metals are fused, and the attraction between the atoms is relatively small. So when zinc in solid solution after reaching saturation, two kinds of zinc iron atom diffusion, spread to (or called infiltration) iron matrix of zinc atom in the lattice matrix migration, gradually formed and iron alloy, and spread to molten zinc liquid iron and zinc in the formation of intermetallic compounds, sank into the hot dip galvanized pot is zinc slag. When the workpiece is removed from the zinc dipping solution, a pure zinc layer is formed on the surface, which is hexagonal crystal. Its iron content is not greater than 0.003%.
With the development of industry, hot-dip galvanizing products have been used in many fields. The advantage of hot-dip galvanizing is that the anti-corrosion life is long and the adaptability to the environment is wide. It has been a very popular anti-corrosion treatment method. It is widely used in power tower, communication tower, railway, highway, light pole, Marine components, construction steel structure components, substation auxiliary facilities, light industry, etc. Hot-dip galvanizing has a long anti-corrosion life, but the anti-corrosion life is not the same in different environments.
Advantages of hot dip galvanizing
1. Low cost: in general, the cost of hot dip zinc is lower than that of other protective coatings. The reason is simple. Other protective coatings such as sand paint are labor-intensive processes.
2. Durable: in the suburban environment, the standard hot-dip galvanized rust thickness can be maintained for more than 50 years without repair; In urban or offshore areas, a standard hot-dip galvanized layer can last up to 20 years without repair;
3. Good reliability: galvanized layer and steel is metallurgical combination, become a part of the steel surface, so the durability of the coating is more reliable;
4. Strong toughness: galvanized layer forms a special metallurgical structure, this structure can withstand mechanical damage in transport and use;
5. Comprehensive protection: each part of the plating can be coated with zinc, even in the depression, sharp corners and hidden places can be fully protected;
6. Time- and effort-saving: galvanized process is faster than other coating construction method, and can avoid the time required after installation on the site.
7. Simple and convenient inspection: hot dip zinc layer can be visually and simple non-destructive coating thickness table for testing