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Difference between hot galvanizing and cold galvanizing in electroplating heating

2019-12-23

The difference in the first process of electroplating heating is that hot-dip galvanizing is a certain time to degrease the workpiece, pickling, dipping, and immersing it in the molten zinc solution after drying.

Cold galvanizing, also called electrogalvanizing, is the use of electrolytic equipment to degrease and pickle the workpiece into a solution containing a zinc salt, and connect the negative electrode of the electrolytic equipment; a zinc plate is placed on the opposite side of the workpiece to connect the electrolytic equipment The positive electrode, connected to the power supply, and using the current to move from the positive electrode to the negative electrode, will deposit a layer of zinc on the workpiece.

The difference between galvanized products: the appearance of hot-dip galvanized does not have the cold and bright galvanized light, but the thickness of the hot-dip galvanized layer is dozens of times that of cold-dip galvanized. The anti-corrosion function is also dozens of times of electro-galvanized.

Hot-dip galvanizing is also called hot-dip galvanizing. It removes oil and rust from steel workpieces and presents a non-staining and moisturizing appearance. It is immediately immersed in a plating bath where zinc is heated and melted in advance to form a The method of zinc coating.

Cold galvanizing is to hang the workpiece that has also passed the degreasing and rust removal, showing no pollution and moisture, to the cathode in a special plating tank, and the anode is zinc. When the DC power is connected, the zinc ions on the anode are moved to the cathode and discharged on the cathode, so that the workpiece is plated with a layer of zinc.

Hot-dip galvanized coatings are thicker, generally 30-60 microns, and have higher corrosion resistance. Steel parts suitable for outdoor work, such as highway fences, power towers, large-scale fasteners, and other "rough" workpieces can be rust-proof for a long time. Earlier iron water pipes were also hot-dip galvanized.

Galvanized, the surface of the workpiece is smooth and smooth, but because the coating is relatively thin, generally within 5-30 microns, the time for corrosion protection will be relatively short. They are used for rust prevention of indoor applications, such as chassis bottoms, panels, and small-scale fasteners.

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