Galvanized strip steel is divided into hot-dip and cold-dip. Hot-dip refers to hot-dip. The quality of hot-dip galvanized strip steel depends mainly on the material of steel and its thermal disposal. Of course, the amount of galvanized strip is also included. For example: ordinary hot-dip galvanized strip steel has 60 grams, 80 grams, 120 grams and so on. The thickness of cold-plated coating will not exceed 15 microns, and that of hot-plated coating will not be less than 30 microns, so that more. In order to ensure the quality of normal rail galvanized strip steel consumer manufacturers, most of them do not use galvanized (cold plating). Generally speaking, galvanized strip refers to hot-dip galvanized strip. In many strip mills in northern China, the amount of zinc is only about 40 grams. It is well known that the amount of zinc directly affects the anti-corrosion ability of pipes. There are cracks and cracks on the surface of normal pipes in the main surface of unqualified strip steel. If the temperature is not controlled properly, the material may be too hard. The bending work of galvanized pipes will be affected to varying degrees.
Stop pickling and clean the whole coil of strip and reach the surface bright and clean.
The second stage
Hot dipping zinc: After pickling, the cleaning is stopped in the tank of ammonium chloride or zinc chloride aqueous solution or mixed aqueous solution of ammonium chloride and zinc chloride. Then it is fed into the hot-dip bath to stop galvanizing.
(2) Hot-dip galvanizing: After pickling, the cleaning is stopped in the tank of ammonium chloride or zinc chloride aqueous solution or the tank of ammonium chloride and zinc chloride mixed aqueous solution. After feeding into the continuous annealing furnace, it enters the galvanizing tank and stops galvanizing.
Direct galvanizing: After pickling, it is fed into continuous annealing furnace and enters galvanizing bath to stop galvanizing.
The third stage
After galvanizing, the galvanized strip can be put into storage. The galvanized layer can be at least 50g/m2 according to customer's requirements, and any sample should not be less than 48g/m2.
Post-treatment of galvanized strip includes passivation, pre-phosphating and oil coating. First of all, to stop passivation treatment of galvanized strip steel can improve the surface structure and gloss of galvanized layer, improve the corrosion resistance and service life of galvanized layer, and improve the separation force between coating and matrix metal. Chromate passivation is mainly used in passivation treatment. Some activators such as fluoride, phosphoric acid or sulphuric acid were added to the passivation solution to obtain thicker chromate film after passivation. When fluoride is present in the passivation solution, the surface tension of the steel strip can be reduced, the film forming reaction can be accelerated, and the chemical polishing effect can be increased, so that the passivation film is fine and bright.
The application effect of galvanized strip steel meets the needs of modern times and has been widely used as building materials in the past. Galvanized strip steel has the characteristics of rust-free and corrosion-resistant for many years. It can not be affected by adverse external environment, and constantly adhere to its own performance and appearance. In the process of using galvanized strip steel, in order to improve its operational efficiency and self-characteristics, it is possible to dispose of galvanized strip steel scrap after suspension, so as to make its performance more excellent.
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