Galvanized coil

define

Galvanized coil, the thin steel plate is immersed in the melting zinc tank, so that the surface of the thin steel plate with a layer of zinc. The main use of continuous galvanizing process production, that is, the rolling steel plate is continuously immersed in the melting zinc plating tank made of galvanized steel plate; Alloyed galvanized steel sheet. This steel plate is also made by hot dipping, but immediately after being taken out of the tank, it is heated to about 500 ° C to form an alloy film of zinc and iron. This galvanized coil has good coating tightness and weldability.

Galvanized refers to the surface of metal, alloy or other materials coated with a layer of zinc to play a beautiful, rust prevention and other surface treatment technology. The main method used is hot dip galvanizing.

Hot dip galvanized

1, the principle of

The hot dip zinc layer is formed by three steps of zinc in liquid state. The surface of iron base is dissolved by zinc liquid to form zinc and iron alloy layer. The zinc ions in the alloy layer are further diffused to the matrix to form a zinc and iron soluble layer. The alloy layer is coated with a zinc layer.

2, performance characteristics

The thick and dense pure zinc layer covers the surface of the steel fastener, which can avoid the contact between the steel matrix and any corrosion solution, and protect the steel fastener matrix from corrosion. In the general atmosphere, a thin, dense layer of zinc oxide is formed on the surface of the zinc layer. It is difficult to dissolve in water, so it plays a certain role in protecting the steel fastener matrix. If zinc oxide and other components in the atmosphere to form insoluble zinc salt, the corrosion resistance is more ideal; With zinc-iron alloy layer, the combination is dense, in the Marine salt spray atmosphere and industrial atmosphere performance unique corrosion resistance; Due to strong binding, zinc - iron mutual solution, has a strong wear resistance; Because zinc has good ductility, its alloy layer is firmly attached to the steel matrix, so hot galvanized can be cold punching, rolling, wire drawing, bending and other forming processes, without damage to the coating; After hot dipping zinc into steel structural parts, it is equivalent to one annealing treatment, which can effectively improve the mechanical properties of steel matrix, eliminate the stress during forming and welding of steel parts, and facilitate the turning of steel structural parts. The surface of the fastener after hot dip zinc is bright and beautiful; Pure zinc layer is the most plastic galvanized layer in hot dip zinc, its properties are basically close to pure zinc, with good ductility.

3. Scope of application

This plating method is especially suitable for all kinds of strong acid, alkali fog and other strong corrosion environment.

Electric galvanized

1, the principle of

Because zinc does not change easily in dry air, and in humid air, the surface can form a very dense film of zinc carbonate, which can effectively protect the interior from corrosion. And when the coating is damaged for some reason and the matrix is not too large, the zinc and steel matrix form a micro cell, so that the fastener matrix becomes the cathode and is protected. It is widely used in automobile transportation and other industries, but what is needed is the trivalent chromium passivation layer, zinc nickel alloy plating closed coating, reduce the harmful and toxic layer of hexavalent chromium passivation.

2, performance characteristics

Zinc coating is thick, fine crystallization, uniform and no pores, good corrosion resistance; Is pure, the zinc plating layer in acid, alkali corrosion, such as fog slowly, can effectively protect the tight sand-fixation matrix, the galvanized layer formed after chromate passivation, color white, army green, beautiful and easy, have certain adornment sex, because the galvanized layer has good ductility, and therefore can be rushed, rolling, cold bending and forming and not damage the coating.

3. Scope of application

Electrogalvanizing involves more and more extensive fields, fastener products have been widely used in mechanical manufacturing, manufacturing galvanized hook mesh, electronics, precision instruments, chemical industry, transportation, aerospace and so on in the national economy is of great significance.

Application field of galvanized coil

A large number of galvanized sheets are used in automobile manufacturing, coolers, construction, ventilation and heating facilities

And furniture manufacturing. Galvanizing has become an important anti-corrosion method for steel, and not just because

Zinc can form a dense protective layer on the surface of steel, also because zinc has a cathodic protective effect when

If the zinc coating is damaged, it can still protect the iron base metal from corrosion by cathodic protection.

Transportation industry: car ceiling, car shell, car board, tractor, tram, container,

Highway walls, ship bulkheads, etc.;

Construction industry: roof, roof components, balcony panels, windowsills, kiosks, warehouses, shutter doors,

Heaters, rainwater pipes, etc.;

Household appliances: refrigerator, washing machine, switchgear, air conditioner, microwave oven, toaster, photocopier,

Vending machines, electric fans, vacuum cleaners, etc.

Furniture industry: lampshade, wardrobe, table, bookshelf, counter, signboard, medical equipment, etc.

Other aspects musical instrument shell, dustbin, billboard, clock, camera equipment, meter, etc.