Galvanized steel strip
Galvanized steel strip is the raw material of coating cold-rolled steel plate with a layer called (zinc, aluminum) to varying degrees. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. The matrix of hot-dip galvanized strip steel reacts with the molten plating solution to form a corrosion-resistant zinc iron alloy layer with compact structure. The alloy layer is integrated with pure zinc layer and strip steel matrix. Therefore, it has strong corrosion resistance.
The post-treatment of galvanized steel strip includes three aspects: passivation, pre phosphating and oiling. Firstly, passivation treatment should be carried out on the galvanized strip steel, which can improve the surface structure and luster of the galvanized layer, improve the corrosion resistance and service life of the galvanized layer, and improve the adhesion between the coating and the base metal. Chromate passivation is mainly used for passivation. Some activators, such as fluoride, phosphoric acid or sulfuric acid, are added to the passivation solution to obtain a thicker chromate film after passivation. When there is fluoride in the passivation solution, it can reduce the surface tension of the steel strip, accelerate the film-forming reaction, increase the chemical polishing effect, and make the passivation film fine and bright.
The application effect of galvanized strip steel meets the modern needs and has been widely used as building materials. Galvanized steel strip has the characteristics of no rust and corrosion resistance for many years. It can not be affected by the external adverse environment and always maintain its own performance and appearance. In the process of using galvanized steel strip, in order to improve its operation efficiency and its own characteristics, the finished galvanized steel strip can be post treated to make its performance better.
Galvanized steel strip is generally used to make steel pipes, such as greenhouse pipe, drinking water pipe, heating pipe and gas transmission pipe; It can also be used in construction, light industry, automobile, agriculture, animal husbandry, fishery, commerce and other industries. The construction industry is mainly used to manufacture anti-corrosion roof panels and roof grilles of industrial and civil buildings; The light industry uses it to manufacture household appliance shells, civil chimneys, kitchen appliances, etc. the automobile industry is mainly used to manufacture corrosion-resistant parts of cars, etc; Agriculture, animal husbandry and fishery are mainly used as tools for grain storage and transportation, frozen processing of meat and aquatic products, etc; It is mainly used for storage, transportation and packaging of materials in commerce; Steel structure sandalwood strip (C, Z-shaped steel); Light steel keel, ceiling keel, etc.