Hot-dip Galvanized Steel Pipe Vegetable Greenhouse Skeleton Type


Contact Information
Joy Huang
Lugu Avenue,Hi-Tech Industrial Development Zone,Ch

- 410205
At present, there are many varieties of vegetable greenhouses on the market, and it is difficult for farmers friends to choose when purchasing greenhouse skeletons. Today we will talk about the little secret of the vegetable greenhouse skeleton.

According to the material, the greenhouse skeleton can be divided into hot-dip galvanized steel pipe and galvanized steel pipe. Hot-dip galvanized steel pipe: the rust-removed steel pipe is immersed in a zinc liquid melted at a temperature of about 600 ° C to adhere a zinc layer on the surface of the steel pipe, and a complex physical and chemical reaction occurs between the hot-dip galvanized steel pipe base and the molten plating solution. Corrosion resistant structure with a tight zinc-iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel pipe base. Therefore, its corrosion resistance is strong.

Galvanized steel pipe: first pickling the steel pipe for pipe making, in order to remove the iron oxide on the steel surface, after pickling, pass the ammonium chloride or zinc chloride aqueous solution or the mixed aqueous solution of ammonium chloride and zinc chloride It is cleaned and then sent to the plating bath. Then air dry and then made into a tube. The coating is more uniform than the hot dip coating, but the coating is thinner and its corrosion resistance is weak.

In summary: according to the material, the vegetable greenhouse frame is made of hot-dip galvanized and galvanized strip. The hot-dip galvanized skeleton has strong anti-corrosion ability, and the anti-corrosion ability of the galvanized belt skeleton is weak. Next, we will analyze the formation of particles on hot-dip galvanized steel pipes.

Small particles similar to rice grains are distributed on the surface of the hot-dip galvanized steel pipe, which is conventionally called zinc particles. It causes rough surfaces that are not only obstructive but also harmful to use. It was confirmed by X-ray microscopic analysis and electron probe analysis that the particles were actually mainly iron-zinc compounds having a composition of FeZn10. The main reasons for the formation of zinc particles are:

1. Excessive slag is floated by mechanical agitation, so that the zinc liquid adheres to the surface of the galvanized workpiece.
2. The temperature of the zinc bath is too high, for example, when the temperature exceeds 470 C, the bottom slag is floated.
3. When the aluminum content in the zinc solution is too high, the solubility of iron in the zinc solution is lowered (when the aluminum content in the zinc solution is less than 0.15%, the solubility of iron is 0.03%). In addition, aluminum has a greater affinity for iron, so that the aluminum will hold the iron tightly, preventing the dross from sinking and suspending in the zinc liquid.
4. Inferior alloys cannot be fully diffused in zinc solution and exist in the form of particles.

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