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What pre-plating processes are required for the production of galvanized steel coils?

Source: AAA Industry IncRelease time: 2019-08-16

With the development of the economy, heavy industry is also progressing and innovating, and at the same time driving up the national economy. In particular, the overall trend of galvanized steel coil has been on the rise and is widely used in our daily life.

Galvanized steel coil in the production, the first pre-plating process, which includes alkaline washing, acid washing, rinsing, help dip, drying five processes, some steel pipe surface oil stains, the need for alkaline washing, with hydrochloric acid to remove the surface of the steel pipe oxide. In order to remove the residual acid and iron salts attached to the surface of the steel pipe, the steel pipe needs to be rinsed twice, and then flux is added to remove impurities on the surface of the steel pipe to ensure that the steel pipe is in clean contact with the zinc liquid and forms a good coating. With the rotation of the spiral, the steel pipe moves downward while forming the inclination angle, and then enters the zinc liquid and continues to move downward. The steel pipe automatically falls on the slide inside the zinc pot and is moved outside by the extraction mechanism, and then the zinc liquid is raised by the pipe lifter. When the steel pipe is lifted to the surface of the magnetic roller, it is sucked and moved to the haul-off roller track. When the production requirements are met, the dragging speed can be reduced to control the zinc loading and reduce the zinc loss. Use the internal blowing method to remove the excess zinc from the inner surface of the steel pipe to obtain a smooth inner surface, so that the removed zinc can form zinc powder and then be recycled. Control the temperature of the water cooling tank at 80°C. The cooling water is pumped into the cooling tower for cooling and then can be recycled. After water cooling, move out the water cooling tank and put it on the inspection stand. After inspection, put the leaking plated tube into the waste paper basket and send the finished tube to the output roller conveyor. The passivation solution is blown on the finished tube ring during transportation to passivate the tube surface. After blowing the outer ring, the excess passivation solution is blown away with compressed air and then dried by a heating tube with steam, and after drying, printing and packaging are carried out.