galvanized sheet steel plate coated with a layer of zinc. Galvanized is a frequently used and effective anti-corrosion. About half of the world's zinc production are used for this process.
Definition of a galvanized sheet
Galvanized steel in order to prevent the steel surface is subjected to corrosion, extending its life in the steel surface coated with a layer of zinc metal, zinc coated sheet steel is called galvanized sheet.
Classification and use of galvanized sheet
Production and processing methods can be divided into the following categories:
① hot-dip galvanized sheet. Thin steel plate immersed in molten zinc bath, so that the adhesion layer of zinc steel sheet. Used the continuous galvanizing process of production, which rolls steel plate continuously immersed in the melting of zinc-plated tank made of galvanized steel;
② alloying galvanized steel. This plate also used hot dip manufacturing, but in the slot immediately heated to 500 ℃, to generate the zinc and iron alloy capsule. This galvanized steel sheet with good paint adhesion and welding;
③ galvanized steel. This galvanized steel plating manufacturing has a good workability. But a thin coating, and corrosion resistance as hot dip galvanized steel sheet;
④ sided plated galvanized steel and double-sided difference. Single-sided galvanized steel, that is only in the side of galvanized products. Welding, painting, rust treatment, processing, has a better adaptability than the two-sided galvanized steel sheet. In order to overcome the shortcomings of the single-sided coated with zinc, have a another top coat a thin layer of zinc galvanized steel sheet, that is double-sided difference galvanized sheet;
⑤ alloys, composite galvanized steel. It is zinc and other metals such as lead, zinc alloyed even composite plated into the steel plate. This plate not only has excellent rust resistance, and good coating performance.
In addition to these five, color galvanized steel, printing, coating galvanized steel, PVC laminated galvanized steel and so on. However, the most commonly used is still hot-dip galvanized sheet.
Other relevant information:
A hot dip galvanized strip significance
Cold-formed steel has generally adopted a black material, cold-formed and put into use simple rust coating treatment after its useful life subject to certain restrictions (usually about five years, there will be a large area of corrosion). Division I to the grand launch of the hot dip galvanized strip, hot strip substrate, pickling, cold rolling, heat reduction, galvanizing process produced, and its products can fully meet the GB510018-2002 cold-formed steel structures "standard in the construction industry can be a lot of applications, can also be used in the car, railroad locomotive manufacturing, warehouse board manufacturing, highway guardrail and other industries.
Two, hot dip galvanized steel strip galvanized
1, the hydrogen reduction method galvanized hydrogen reduction galvanized invented in 1937, hydrogen reduction method hot-dip galvanizing has laid the foundation for modern continuous galvanizing. By hydrogen reduction process for the production of products, the quality of its appearance, the binding of zinc coating is superior to solvent galvanized. Reduction galvanized strip by pickling into the heating reduction furnace, the hydrogen reduction of oxide film out after pickling, and in heating the steel plate surface reduction process, to restore a layer of spongy layer, into the zinc pot can produce a layer of two-way binding, uniform zinc alloy layer, greatly increasing the adhesion of the zinc layer, which also determines the cost of energy consumption in its galvanizing higher.
2, ammonium chloride solvent zinc ammonium chloride solvent galvanized steel was invented in 1837. Ammonium chloride solvent process for the production of products, ammonium chloride solvent galvanized no heat reduction process, the quality of its appearance and galvanized surface binding capacity than the hydrogen reduction method galvanized slightly worse. This also determines the energy consumption cost of galvanizing, hydrogen reduction of a law galvanized low.
Three galvanized steel sheet galvanizing is generally 180-220g / ㎡, a corresponding increase in the humid south the galvanized amount to 275g / ㎡ to improve the life of the steel components. The service life of galvanized products are generally 20-25 years.
, Electro-galvanized layer of galvanized steel zinc layer characteristics can not be formed, hot dip galvanized coatings spangle spangle, and its formation process is as follows: When the galvanized zinc pan out, the injection by the air knife a large number of liquid zinc was blown back to the zinc pot, when the surface of the strip of pure zinc layer is liquid attached to the plate surface, the formation of large crystalline nuclear plate surface, with the steel plate increased by cooling, crystallization nuclear slowly into the zinc flowers. Cooling, the faster the smaller the spangle slower cooling zinc spend the greater.
No flowers galvanized sheet:
In fact, zinc flower only has the ornamental value, practical value, the opposite is not good in terms of anti-corrosion, in the developed countries have implemented a small spangle and no spangle galvanized steel.