After hot galvanizing, the anticorrosion of channel steel will be better and the environment is more widely used. Ji'nan galvanized pipe is widely used in power tower, communication tower, railway, highway protection, street lamp pole, marine components, building steel structural components, substation auxiliary facilities, light industry and other industries. Generally, the hot-dip galvanizing process is divided into external annealing and intra line annealing according to the different methods of pre plating treatment according to the habit.
1, out of line annealing
Before the line annealing is the hot or cold rolled steel entering the hot-dip galvanizing line, the recrystallization annealing is carried out in the bottom annealing furnace or the bell type annealing furnace. Because the steel must maintain a clean pure iron active surface without oxide and other dirt before hot dip galvanizing. This method is to remove the annealed iron oxide scales first by acid washing, and then coat a layer of zinc chloride or a mixture of ammonium chloride and zinc chloride to protect them, so as to prevent the steel from being oxidized again.
2. Wet hot dip galvanizing
The solvent of the surface of the galvanized steel tube of Ji'nan has been hot-dip galvanized by the zinc solution, which covers the surface with molten state solvent without drying. The disadvantage of this method is: only lead-free status under the galvanized coating alloy layer is very thick and poor adhesion; generation of zinc are accumulated in the interface of liquid zinc and lead liquid can not be deposited on the bottom, so steel through the zinc layer surface pollution.
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