1. hot galvanizing: zinc layer thickness, corrosion resistance, high price.
Hot-dip galvanizing process: the iron is cleaned, then the solvent is treated, dried and immersed in zinc solution. The iron reacts with molten zinc to form an alloyed zinc layer. The process is degreasing-washing-pickling-assisting plating-drying-hot dipping-galvanizing-separation-cooling passivation.
2. zinc plating: thin zinc layer, poor corrosion resistance and low price.
Zinc plating process: chemical degreasing hot water washing water washing electrolytic relief oil hot water washing water washing strong corrosion water washing galvanized ferroalloy water washing light out passivation water washing drying.
Hot dip galvanizing, also known as hot dip galvanizing, is the method of forming a layer of zinc coating on the surface of the steel workpiece by degreasing, rusting, showing a clean, wet surface, immediately immersed into the galvanizing bath which melts the zinc in advance.
Cold galvanizing is the same after oil removal, rust removal, showing a pollution-free, soaking workpiece hanging on the cathode in a special electroplating bath, anode zinc. Turn on the DC power supply, the zinc ion on the anode migrates to the cathode, and discharges on the cathode, so that the workpiece is coated with a layer of zinc.
The hot-dip galvanized coating is thicker, generally 30-60 microns, and the coating has higher anticorrosion ability. Steel parts suitable for outdoor work, such as highway fences, power towers, large-size fasteners and other relatively rough parts of the long-term rust prevention. The earlier iron water pipes are also hot-dip galvanized.
Galvanized, the surface of the workpiece is smooth and smooth, but because the coating is thin, generally within 5-30 microns, so the time for corrosion protection will be shorter. They are used for rust prevention in indoor parts.
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