Galvanized bridge, also known as electric galvanized bridge; Generally understood as galvanized bridge that is hot-dip galvanized bridge, in fact, it is wrong, like galvanized pipe, galvanized bridge is divided into two kinds, namely, cold galvanized (electric galvanized) and hot-dip galvanized (hot-dip galvanized);
Iron and steel rust easily in air, water or soil, or even completely damaged. The annual steel loss caused by corrosion accounts for about 1/10 of the entire steel output. On the other hand, in order to make steel products and parts have a special function on the surface, and give its surface decorative appearance at the same time, so it is generally treated in the way of electric galvanizing.
1.Principle:
Because zinc is not easy to change in dry air, and in humid air, the surface can form a very dense basic zinc carbonate film, this film can effectively protect the interior from corrosion. And when the coating is damaged for some reason and the steel base is not too large, the zinc and the steel matrix form a microbattery, so that the steel matrix becomes the cathode and is protected.
2. Performance Characteristics:
1) The zinc coating is thick, the crystallization is fine, uniform and no pores, and the corrosion resistance is good;
2) The zinc layer obtained by electroplating is pure and corrodes slowly in acid and alkali fog, which can effectively protect the steel matrix;
3) Zinc coating formed by chromic acid passivation white, color, military green, beautiful, has a certain decorative;
4) Because the zinc coating has good ductility, it can be cold blanking, rolling, bending and other forming without damaging the coating.
3. Application scope:
With the development of science and technology, electroplating industry involves more and more extensive fields. At present, the application of galvanizing has been throughout the production and research departments of the national economy. For example, machine manufacturing, electronics, precision instruments, chemical industry, light industry, transportation, weapons, aerospace, atomic energy, and so on, are of great significance in the national economy.
Hot-dip galvanized bridge (hot-dip zinc bridge)
1, hot dip zinc description:
Hot dip zinc is one of the best coating methods for protecting steel substrate. It is in the liquid state of zinc, after quite complex physical and chemical action, not only on the steel plating thicker pure zinc layer, but also generate a zinc – iron alloy layer. This plating method not only has the characteristics of corrosion resistance of galvanizing, but also has the zinc-iron alloy layer. It also has a strong corrosion resistance that can not be compared with galvanizing. Therefore, this plating method is especially suitable for all kinds of strong acid, alkali fog and other strong corrosion environment.
2.Principle:
Hot dip zinc layer is formed in three steps under high temperature liquid:
1) The iron base surface is dissolved by zinc solution to form a zinc-iron alloy phase layer;
2) The zinc ions in the alloy layer further diffuse to the matrix to form a zinc-iron miscible layer;
3) The surface of the alloy layer encloses the zinc layer.
3. Performance characteristics:
(1) With a thick dense pure zinc layer covering the surface of the steel, it can avoid the steel matrix and any corrosion solution contact, protect the steel matrix from corrosion. In the general atmosphere, the surface of the zinc layer forms a very thin and dense zinc oxide layer surface, it is difficult to dissolve in water, so it plays a certain protective role on the steel matrix. If zinc oxide and other components in the atmosphere to form insoluble zinc salt, corrosion protection is more ideal.
(2) There are iron – zinc alloy layer, compact, in the Marine salt spray atmosphere and industrial atmosphere performance unique corrosion resistance;
(3) Due to the firm combination, zinc-iron miscible, with strong wear resistance;
(4) Because zinc has good ductility, its alloy layer and steel base firmly attached, so hot plating parts can be cold stamping, rolling, drawing, bending and other forms without damaging the coating;
(5) After hot-dip galvanizing of steel structural parts, it is equivalent to a single annealing treatment, which can effectively improve the mechanical properties of steel matrix, eliminate the stress during forming and welding of steel parts, and is conducive to the turning of steel structural parts.
(6) The surface of the accessories after hot dip galvanizing is bright and beautiful.
(7) Pure zinc layer is the most plastic layer of hot dip galvanized layer, its properties are basically close to pure zinc, ductility, so it is flexible.
4. Application scope:
The application of hot dip galvanizing expands with the development of industry and agriculture. Therefore, hot-dip galvanized products in industry (such as chemical equipment, petroleum processing, Marine exploration, metal structure, power transmission, shipbuilding, etc.), agriculture (such as: irrigation, greenhouse), construction (such as: water and gas transmission, wire casing, scaffolding, housing, Bridges, transportation, etc., has been widely used in recent years. Hot-dip galvanized products are more and more widely used because of their beautiful appearance and good corrosion resistance.
Two, the difference between spray bridge and galvanized bridge
Spray bridge and galvanized bridge are only different in process, the specifications, models, shape and structure of the bridge are identical.
The process difference between spray bridge and galvanized bridge:
First of all, galvanized bridge and plastic spraying bridge belong to metal cable bridge, galvanized bridge is made of galvanized steel plate, galvanized plate I believe there is no need to explain too much, and the plastic spraying bridge is used to process a layer of electrostatic spraying layer on the surface of galvanized bridge, so it is called plastic spraying bridge, simple understanding is that the plastic spraying bridge is the upgrade version of galvanized bridge, corrosion resistance is stronger.
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Post time: Mar-29-2023