Roof natural ventilator is also called smoke vent rooflight. As a professional smoke vents supplier in China, Mcwell produces continuous rooflight whose skeleton materials are mainly hot-dip galvanized profiles. Hot-dip galvanized profiles are produced using advanced hot-dip galvanizing line technology. The surface of the product is brilliance, no leakage, no dripping, uniform zinc layer, strong adhesion, material conforming to national standards, and good corrosion resistance.

The production process of the hot-dip galvanized rectangular tube: Before the hot-dip galvanized rectangular tube enters the hot-dip galvanizing production line, the selected flat rectangular tube is first sent to the pickling workshop, and the hot-dip galvanized rectangular tube is soaked in sulfuric acid or hydrochloric acid to remove it. Iron oxide scale and floating rust on the surface. After 2 pickling, the pickling time is about 30-50 minutes depending on the raw material of the hot-dip galvanized

rectangular tube. After the rust and oxide scale on the surface of the rectangular tube is pickled off, immediately immerse it in the clean water tank and wait for galvanizing. This can prevent the hot-dip galvanized rectangular tube from re-oxidation. After the second clean water cleaning, it is transported to the drying bed for drying, and then the hot-dip galvanized rectangular tube is immersed in a zinc bath at about 460℃ for hot-dip galvanizing. According to different requirements of customers, the dried and cooled hot-dip galvanized rectangular tube shall be oiled or passivated. The galvanized products produced by this method have improved anti-corrosion ability.

In the general environment, the hot-dip galvanized anti-rust thickness of the hot-dip galvanized rectangular tube can be maintained for more than 50 years without repairing; in urban or offshore areas, the hot-dip galvanizing anti-corrosion layer can be maintained for 20 years without repairing; The galvanized layer of the galvanized rectangular tube and the steel are metallurgically bonded and become a part of the steel surface. Therefore, the durability of the coating of the hot-dip galvanized rectangular tube is relatively reliable; the coating has strong toughness, and the galvanized layer forms a special Metallurgical structure, this process of hot-dip galvanizing rectangular tube, can withstand mechanical damage during transportation and use!