1. The production process (process) is different: cold galvanizing is to use electrolytic equipment to degrease and pickle the workpiece and put it into a solution composed of zinc salt, and connect the negative electrode of the electrolytic equipment, and place a zinc plate on the opposite side of the workpiece to connect At the positive pole of the electrolysis equipment, turn on the power supply, and use the directional movement of the current from the positive pole to the negative pole, so that zinc will gradually coat the surface of the wire. The production speed is slow, the coating is uniform, and the thickness is relatively thin, usually only 3μm~15μm, and it will rust in a few months

Hot-dip galvanizing is to degrease the workpiece, pickle it, dip it in medicine, dry it, and then immerse it in the heated and melted zinc solution for a certain period of time, and then take it out. The production speed is fast, the coating is thick but uneven, the minimum thickness allowed by the market is 45pm, and the maximum can reach more than 300pm. The color is darker, consumes more zinc metal, and has good corrosion resistance. Hot-dip galvanizing can be maintained for decades in outdoor environments.

2. The brightness is different: the appearance of cold-dip galvanized is bright and silver-white; the appearance of hot-dip galvanized is not as delicate and bright as that of cold-dip galvanized, and it is slightly black, and the color is like "lead", so hot-dip galvanized wire is sometimes called "lead". lead wire". Based on this feature, we can specifically identify them from the color.

3. The amount of zinc applied is different: the amount of zinc applied refers to the weight of the zinc layer per square meter on the surface of the plated part (unit: g/m2). Less cold plating (electroplating), coating thickness 3μm~15um, generally 4~13g/m

More hot-dip plating, coating thickness 45μm~300pm, generally 30~60g/㎡, up to 300 g/m2

Note: When evaluating the amount of zinc on a plated piece, sometimes the thickness of the zinc layer (unit: mm or m) is used to measure and express

4. The market price is different:the amount of zinc on cold galvanizing is very small, and the price is relatively cheap.

5. Corrosion resistance and use environment are different: cold galvanizing has poor corrosion resistance, while hot galvanizing has good corrosion resistance.

Cold galvanizing is mainly used for anti-corrosion of various steel products and structures, and is more suitable for repair work. Only repairing the damaged parts of the protected steel surface can restore the original state. The effect of cold plating is at most equivalent to that of applying anti-rust oil.

Hot-dip galvanizing is galvanizing under hot-dip conditions (that is, heating and melting pure zinc into zinc liquid) (then immersing the plated parts in the zinc liquid), which has strong adhesion, not easy to fall off, and corrosion resistance. Strong, long service life and other advantages