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The difference between pre-galvanized and hot-dip galvanized

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1, hot dip galvanized: also known as hot dip zinc and hot dip galvanized: is an effective way of metal anticorrosion, it is melting the zinc ingot at high temperature, in some auxiliary materials, and then the metal structure into the galvanizing tank, so that the metal components attached to a layer of zinc layer, so as to play the purpose of anticorrosion. The advantage of hot dip galvanizing is in its strong anti-corrosion ability, good adhesion and hardness of galvanized layer, so as to play the purpose of anticorrosion.

Pre-galvanized: it is cold galvanizing, the amount of zinc is less, generally 40g / m2, is the use of electrolysis to make the metal or other materials of the surface attached to a layer of metal film process. The process of forming a uniform, dense and well-combined metal layer can prevent corrosion, improve wear resistance, electrical conductivity, reflection and improve aesthetic appearance.

2, galvanized finished products difference

The difference between galvanized products: pre-galvanized appearance fine and bright, coating uniform. But the thickness of zinc layer is hot galvanizing is dozens of times that of cold galvanizing. The corrosion resistance is also dozens of times that of electrogalvanizing.

Hot dip galvanizing, also known as hot dip zinc, is the steel workpiece after oil removal, rust removal, showing a dirty, infiltration surface, immediately immersed in the zinc heating melting tank in advance, to form a layer of zinc coating on the surface of the workpiece.

3. Difference in use

Hot-dip galvanized: long-term rust prevention of steel parts suitable for outdoor work, such as highway fence, power tower, large size fasteners and other relatively “rough” workpieces. The earlier iron water pipes were also hot-dip galvanized.

Electroplated zinc: are used in the indoor use of manufacturing rust prevention, such as the bottom of the shell, panel, small size fasteners, etc.

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