First, common skeleton types
1. Hot-dip galvanized skeleton material
Hot-dip galvanized pipes are used to galvanize common steel pipes in order to improve the corrosion resistance of steel pipes. The galvanized tube reacts the molten metal with the iron substrate to produce an alloy layer, thereby combining the substrate and the plating layer. Hot-dip galvanizing is to pickle the steel pipe first, in order to remove the iron oxide on the surface of the steel pipe, after pickling, wash through the ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank and then send Hot dip plating bath. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. The complex physical and chemical reactions between the steel pipe substrate and the molten plating solution form a tightly structured zinc-iron alloy layer with corrosion resistance. The alloy layer is integrated with the pure zinc layer and the steel pipe substrate. Therefore, its corrosion resistance is strong.

Hot-dip galvanizing standard: Weight of galvanized layer: According to the requirements of the purchaser, galvanized steel pipe can be used to determine the weight of zinc layer. The average value should not be less than 500g / m2, and any sample should not be less than 480g / m2.

 The advantages of hot-dip galvanized skeleton materials are that the zinc layer is thick, the anti-rust ability is strong, and the service life is more than one year.

 2. Cold galvanized skeleton material
Cold galvanized is electro-galvanized, the amount of galvanized is very small, only 10-50g / m2, its own corrosion resistance is much worse than hot galvanized pipe. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use electro-galvanized (cold plating).

 The advantage of cold galvanizing is low cost, but short service life. It will start to rust in about two years under high temperature and high humidity environment, affecting the normal use of the greenhouse.

3. Plastic spray skeleton material
Plastic spray frame material is a kind of greenhouse steel that is spray-treated on the basis of the first or second frame. The service life of this greenhouse frame material can be more than thirty years, and its cost is the most expensive It is currently the mainstream high-end imported type and the most used material in the Dutch glass greenhouse.

 Second, why use the processed steel skeleton in the greenhouse
Because the environment in which vegetables are grown is a high-temperature and high-humidity environment, ordinary steel materials are severely rusted, so it is necessary to use skeleton materials with good anti-corrosion ability. At the same time, it is a high-investment product to construct agricultural greenhouses, so it is necessary to lower their average annual cost through longer use.

 At present, the professional greenhouse skeleton materials are all assembled installation methods. That is, the steel needs to be cut in the workshop, drilled, and then packaged and shipped to the construction site for assembly. This assembly process will not break the zinc layer of the steel, and the assembly speed is faster and the wind resistance is better. The world’s most popular method of processing greenhouse skeletons. Also, whether it is from the current ground-inserted arch shed, to the multi-span film greenhouse, the multi-span solar panel greenhouse, and the multi-span glass greenhouse, the assembled installation has been realized. This grower can learn about it when purchasing.