Hot dip galvanized iron wire is an iron wire produced by drawing, heating, and then drawing low-carbon steel wire, and finally coating the surface with zinc through the hot-dip coating process. The amount of zinc added is generally controlled within the range of 30g/m ^ 2 to 290g/m ^ 2 according to the requirements of the usage environment.
Author: Marisa
Hot dip galvanized iron wire is an iron wire produced by drawing, heating, and then drawing low-carbon steel wire, and finally coating the surface with zinc through the hot-dip coating process. The amount of zinc added is generally controlled within the range of 30g/m ^ 2 to 290g/m ^ 2 according to the requirements of the usage environment. Due to the long anti-corrosion period and wide usage environment of products produced by hot-dip galvanizing technology, hot-dip galvanized iron wire is widely used in various fields such as heavy industry, light industry, agriculture, etc. in the form of nets, ropes, and wires.
Hot dip galvanizing, also known as hot-dip galvanizing or hot-dip galvanizing, is an effective method of metal corrosion prevention, mainly used on metal structures and facilities in various industries. It is to immerse the rust removed steel parts in a molten zinc solution at around 500 ℃, so that a zinc layer is attached to the surface of the steel components, thereby achieving the purpose of corrosion prevention.
Hot dip galvanizing process flow: Zinc wire pickling - water washing - adding auxiliary plating solution - drying - hanging plating - cooling - medicating - cleaning - polishing - completion of hot dip galvanizing.
Hot dip galvanized wire annealing: During the drawing process, the stress of low-carbon steel wire increases continuously, so it must be annealed before galvanizing. The return temperature is around 800-830 ℃. Generally, the temperature of the steel wire drawn from Q195 steel wire is relatively low, while the temperature of the low-carbon steel wire drawn from Q235 steel wire is relatively high.
Hot dip galvanized wire pickling: Generally, hydrochloric acid is chosen for pickling, with a ratio of 1:1. There is no temperature limit for pickling, and room temperature is sufficient. If the surface of the steel wire is severely corroded, the concentration of hydrochloric acid can be slightly increased. If the surface of the steel wire is smooth and intact, the pickling time can be shortened.
When hot-dip galvanized wire is pickled, ferrous ions will continuously precipitate and the content will also increase. When the iron salt reaches 150 g/L, the pickling speed will be greatly slowed down. At this time, 2/3 can be extracted, and then 2/3 of hydrochloric acid can be added. The concentration of hydrochloric acid added again is 1:1.
Hot dip galvanizing wire assisted plating: The plating agent is an important process before hot-dip galvanizing, which can activate the surface of steel, avoid surface oxidation of steel wire, improve the quality of galvanizing, and reduce the generation of zinc slag, thereby reducing production costs.
Hot dip galvanized wire galvanizing: Hot dip galvanizing is the key to the entire process. After experimental research, it has been found that when the temperature is between 440-460 ℃, hot dip galvanizing can achieve the most satisfactory effect. A lower temperature can reduce the influence of silicon on the galvanized layer and reduce the generation of zinc and zinc slag. If the temperature is too high, the production of zinc slag and zinc ash will intensify, and the service life of the zinc heating furnace will also be shortened.
Removal of zinc slag from hot-dip galvanized wire: After hot-dip galvanizing, it is inevitable to produce zinc slag, which increases more and more. Zinc slag is mainly an intermetallic compound of iron and zinc, and its specific gravity is greater than that of zinc liquid, so it will sink at the bottom. When zinc slag accumulates to a certain extent, it may still adhere to the surface of the steel wire, affecting the quality of the galvanized layer. At the same time, its thermal conductivity is poor, and it can also accumulate on the wall of the zinc boiler, affecting heat conduction and reducing the lifespan of the zinc pot.