When the fence is in protection, due to long-term wind, sun and rain, anti-corrosion treatment has become a problem. At present, the anti-corrosion treatment has been carried out by the method of surface galvanizing, and galvanizing is divided into hot and cold plating ; What is the difference between the two? One is chemical treatment and the other is physical treatment; the hot-dip galvanizing layer is firm and not easy to fall off.
We first adopted the hot-dip galvanizing and hot-dip galvanizing methods (preparation of the mesh → pre-plating treatment → hot-dip plating → post-plating treatment → product inspection, etc. According to the custom, it is often based on the pre-plating treatment method); cold galvanizing In fact, it is electro-galvanized; it is used to protect metals from corrosion. For this purpose, zinc filler coatings are used. In fact, a coating method is applied to the surface of the object to be protected. After drying, a zinc filler layer is formed. This process method The amount of galvanizing is very small, only 10-50g/㎡, and its corrosion resistance is much different than that of hot-dip galvanizing.
Out-of-line annealing of hot-dip galvanizing: Before entering the hot-dip galvanizing homework line, the recrystallization annealing is first carried out in a bottom-drawing annealing furnace or a bell-type annealing furnace. In this way, there is no annealing process in the galvanizing line. Before hot-dip galvanizing, the mesh must be on a clean pure iron active surface free of oxides and other dirt. This method is to clean the surface of the annealed fence mesh by pickling. Then apply a layer of solvent consisting of zinc chloride or a mixture of ammonium chloride and zinc chloride for maintenance, and then avoid oxidation.
Single mesh method: first send the annealed mesh to the pickling workshop, use sulfuric acid or hydrochloric acid to remove the oxygen hot-dip galvanizing iron sheet on the surface of the steel plate. Avoid re-oxidation of the mesh, and then go through pickling, water cleaning, squeezing, drying, hot-dip galvanizing into the zinc pot (the temperature is constantly maintained at 445-465 ℃), and then oiling and chromizing treatment. This method is produced The hot-dip galvanized mesh is better than wet-galvanized products.
Post time: Sep-02-2020