(1) Flange galvanizing allows every part of the coating to be galvanized, and the galvanized layer forms a special metallurgical structure; even if it is mechanically damaged during transportation and use, the structure will not be greatly affected; even in grooves, sharp corners and hidden positions can be fully protected, so the durability of the coating is more reliable; usually in suburban environments, the standard hot-dip galvanizing anti-rust thickness can be maintained for more than 50 years without maintenance; in urban areas or offshore areas, the standard hot-dip galvanizing anti-corrosion layer can be maintained for 20 years without maintenance.
(2) The galvanizing process is faster than other coatings, and the time required for on-site painting after installation can be avoided. The cost of hot-dip galvanizing is relatively low.
According to the production and processing methods, galvanized flanges can be divided into hot-dip galvanized flanges, cold-dip galvanized flanges (electro-galvanized flanges), etc.; the processing methods of galvanized flanges are different, and the galvanized flanges have different characteristics and applications, such as:
(1) Hot-dip galvanizing is to immerse the rusted steel parts in a molten zinc solution at about 500°C, so that the zinc layer adheres to the surface of the steel parts to achieve the purpose of corrosion protection; this is an effective metal anti-corrosion method, hot-dip galvanizing has a long anti-corrosion period, but the anti-corrosion period is different in different environments, 30 years in cities and 13 years in heavy industrial areas; therefore, hot-dip galvanized flanges are mainly used in metal structural facilities in various industries.
2) Cold galvanizing refers to electro-galvanizing, which can be white zinc, blue zinc or other materials. The electro-galvanized flange has a smooth appearance, no zinc nodules and burrs, and is silver-white; the thickness is controllable, there is no hydrogen embrittlement, no temperature damage, and the mechanical properties of the material can be ensured to be the same, and it has good corrosion resistance and surface oxidation resistance. It is strong, wear-resistant, easy to operate and easy to install. It is used for corrosion protection of various steels and structures.
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