The inorganic lubricating film and organic lubricating film of hot-dip galvanizing products are also hot spots
Inorganic lubricating film and organic lubricating film of hot-dip galvanizing products are also hot topics. Study on zinc pot technology  1 zinc slag. Zinc slag is an intermetallic compound of iron, zinc and aluminum. When it adheres to the surface of the coating, zinc slag defects are formed. Zinc slag in zinc pot is divided into surface slag, bottom slag and suspended slag, which can be controlled by zinc steel aluminum content and iron content, zinc steel!Temperature stability control and temperature field and concentration field stability control of zinc steel to reduce zinc slag defects. Meanwhile, high surface quality of pure zinc and alloying hot dip galvanized products of new hot galvanizing unit system usually adopts double zinc steel, pure zinc products and alloying respectively, hot dip galvanized products, in order to reduce using single zinc steel system in time to switch from the product produced by a large number of zinc slag defects, improve the product table, surface quality, but also conducive to the stability control of zinc pot temperature and aluminum content. In China, the yield control of zinc-slag is relatively thin and weak, so the formation mechanism and control of zinc-slag should be further studied. 2. Study on the flow field of zn steel the flow of zn fluid in zn steel will directly influence the behavior of zn slag and zn ash embedded in the coating, thus affecting the surface quality of the final product. In general, the solid or numerical simulation method is used to simulate the flow of zinc liquid in the zinc pot. S J Lee et al. simulated the flow field of zinc steel using a 1:5 transparent water simulator with induction heater, scraper and baffle, and studied the flow characteristics of zinc fluid and the influence of submerged roll on the flow field. But water simulation simulator can only be observed in the inland waters flow of two-dimensional flow field, has its limits, and adopt the method of numerical simulation, the velocity field of the section, can get any help in understanding the zinc liquid flows in different areas.The study on the flow field of zinc-steel should be strengthened to improve the heating mode of zinc-steel and the adding position of zinc-ingot. The influence of zinc liquid composition on the coating mainly refers to the influence of aluminum content and iron content, and its direct influence!The adhesion of the coating and the production of zinc slag need to be controlled accurately. When hot plating pure zinc, adding 0.005%~ 0.020%, A1 into the zinc solution can significantly improve the brightness of hot galvanizing layer and reduce the surface oxidation of zinc solution. When more than 0.15% of A 1 is added into zinc solution, the formation of fe-zn alloy phase can be inhibited and the coating with suitable thickness and good adhesion can be obtained. The content of aluminum in the zinc pot is usually controlled at 0.10%~0.20% when the strip is hot-plated continuously. When producing alloying hot-dip galvanizing products, the content of aluminum can be reduced, so as to reduce galvanizing and alloying time, improve unit speed and reduce cost. However, the stable control of aluminum content in zinc pot has always been a difficult problem in production. It is necessary to conduct in-depth study on the on-line detection and control of the effective aluminum content in zinc pot and the logistics balance of zinc steel. 4 zn steel equipment research zn steel equipment mainly includes sink roll, stabilizer roll and its accessory equipment. The existing advanced hot, galvanized production line mostly USES the ceramic zinc pot of fluting type, built-in 1 sink roll and 2 stable roll (or orthodontic roll). In order to ensure the stable operation of strip steel and improve the surface quality of galvanized products, it is necessary to study the shape and spacing of the zinc groove on the surface of the submerged roll. In addition, the short life of the sunk roller and its bearing has been a difficult problem in hot-dip galvanization production.And other aspects of research. The technology of zinc-pot scraper is also developed for the defects of submerged roll and stable roll. In addition, coreless zinc pot and premolten zinc pot have also developed more mature. Unsinkable roll zinc steel is also a hot research topic. Move according to the electric and magnetic field formed magnetohydrodynamic closed MH (D) the principle and design of vertical zinc steel, can make the steel belt directly from steel, zinc in zinc liquid through the, won't cause wear and tear, also most He Yi corrosion in zinc steel parts, and can realize high speed galvanized, save energy. However, in order to realize commercial application, it is necessary to deeply study the problems of sealing flow stability and walking band stability. High strength, high strength galvanized steel technology high strength steel has been the focus of research on the plating.