The difference of hot and cold galvanized steel pipe for eps silo

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The eps silo rack is important for eps silo system,either for silo of pre-expanded EPS, or silo of recycled EPS materials.We take hot galvanized pipe not cold galvanized pipe materials for eps silo rack.Our pipe is galvanized inside and outside of the pipes.The difference of hot and cold galvanizing is big,pls see below.

Definition Difference

Hot galvanizing is also called as hot-dip galvanizing. It melts the zinc ingot at high temperature, puts some auxiliary materials, and then dips the metal structure into the galvanizing tank, so that a layer of zinc is attached to the metal component. The advantage of hot-dip galvanizing lies in its strong anti-corrosion ability, and good adhesion and hardness of the galvanized layer.

eps silo rack
eps silo rack

“Cold galvanizing” means “electroplating”, the zinc salt solution is electrolyzed to coat the plated parts. Generally speaking, there is no need to heat, and the amount of zinc is very small, and it is easy to fall off in a humid environment. Cold galvanizing is also called electro-galvanizing. It uses electrolysis equipment to put the workpiece in a solution of zinc salt after degreasing and pickling, and connect it to the negative electrode of the electrolysis device; place a zinc plate on the opposite side of the workpiece and connect it to the electrolysis device The positive pole, turn on the power, use the directional movement of the current from the positive pole to the negative pole, and a layer of zinc will be deposited on the workpiece.

Chemical process difference

Hot-dip galvanizing is for steel grating, we strongly recommends hot-dip galvanizing.Hot-dip galvanizing is a chemical treatment, which is an electrochemical reaction.

eps silo drawing
eps silo drawing

Cold galvanizing is a physical treatment, just brushing a layer of zinc on the surface, so the zinc layer is easy to fall off. Hot-dip galvanizing is often used in building construction.

Continuous hot-dip galvanizing process: steel → heating → cooling to galvanizing temperature → galvanizing → cooling

Cold galvanizing is electro-galvanizing, only 10-50g/m2, and its corrosion resistance is much different than that of hot-dip galvanizing. The price of electro-galvanizing is relatively cheaper.

Hot-dip galvanizing means that the steel body is galvanized on the surface under the condition of hot dipping. It has strong adhesion and is not easy to fall off. Although the hot-dip galvanized pipe also appears rust, it can meet the requirements of technology and hygiene in a long period of time.

Pipe diameterPipe thicknessPipe length
4*4cm0.75mm2-8m

Making Process difference

First, the difference in the process is: hot-dip galvanizing is to immerse the workpiece in the molten zinc solution for a certain period of time after degreasing, pickling, dipping, and drying.

Cold galvanizing is also called electro-galvanizing. It uses electrolysis equipment to put the workpiece in a solution of zinc salt after degreasing and pickling, and connect it to the negative electrode of the electrolysis device; place a zinc plate on the opposite side of the workpiece and connect it to the electrolysis device The positive pole is connected to the power source and the current is moved from the positive pole to the negative pole to deposit a layer of zinc on the workpiece.

The difference between galvanized products: hot-dip galvanizing is not as delicate and bright as cold galvanizing, but the thickness of the zinc layer is dozens of times that of cold galvanizing. The anti-corrosion performance is also dozens of times that of electro-galvanized.

Hot-dip galvanizing is also called hot-dip galvanizing, which is to degrease and derust the steel workpiece to present a non-polluting and infiltrating surface. It is immediately immersed in a plating tank where the zinc is melted by heating in advance to form a surface on the workpiece.

Cold galvanizing is to hang the work piece that has also gone through degreasing and derusting and showing no pollution and infiltration into the cathode in a special electroplating tank, and the anode is made of zinc. The method in which the zinc ions on the anode migrate to the cathode and discharge on the cathode when the DC power supply is turned on, so that the workpiece is coated with a zinc layer.

automatic eps silo system
complete eps silo system from China

The coating of hot-dip galvanizing is thick, generally 30-60 microns, and the coating has a high anti-corrosion ability. It is suitable for long-term rust prevention of iron and steel parts for outdoor work, such as highway fences, power towers, large-size fasteners and other relatively “rough” workpieces. Older iron water pipes were also hot-dip galvanized.

Electro-galvanized, the surface of the workpiece is smooth and flat, but because the coating is relatively thin, generally within 5-30 microns, the anti-corrosion time will be shorter. They are all used indoors to prevent rusting of parts, such as chassis bottoms, panels, and small-size fasteners.

Hope that the above introduction can help you understand the square steel rack for eps silo system from China.

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