1.Considering the particularity of corrugated culvert, the manufacturer strongly recommends using hot-dip galvanized corrugated culvert
Hot-dip galvanizing is a chemical treatment, which is an electrochemical reaction. Cold galvanizing is a physical treatment, just brushing a layer of zinc on the surface, so the zinc layer is easy to fall off.

Metal corrugated culverts are mostly hot-dip galvanized in 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 is the galvanizing of metal corrugated culvert pipes on the surface under hot-dip conditions. It has strong adhesion and is not easy to fall off. Although hot-dip galvanized pipes also appear rust, they can meet the requirements of technology, Hygiene requirements.

2.Process difference

First of all, the difference in the process is: hot-dip galvanized metal corrugated culvert pipes are degreasing, pickling, dipping, and drying, and then immersed in molten zinc solution for a certain period of time.

Cold galvanized metal corrugated culvert pipe is also called electro-galvanized. It uses electrolysis equipment to degreasing and pickling the metal corrugated culvert into a solution of zinc salt, and connect it to the negative electrode of the electrolytic equipment; place a zinc plate on the opposite side of the workpiece Connect to the positive electrode of the electrolysis equipment, turn on the power, and use the directional movement of the current from the positive electrode to the negative electrode to deposit a layer of zinc on the workpiece.

The difference between metal corrugated culverts: hot-dip galvanized metal corrugated culverts are not as delicate and bright as cold-dip galvanized metal corrugated culverts, but the thickness of the zinc layer is dozens of times that of cold galvanized. The coating of hot-dip galvanizing is thicker, generally 30-60 microns, and the coating has a higher anti-corrosion ability, and its anti-corrosion performance is also dozens of times that of electro-galvanizing. It is suitable for long-term rust prevention of iron and steel parts for outdoor work, such as highway fences, electric towers, and size fasteners. Older iron water pipes were also hot-dip galvanized.

Electro-galvanized, metal corrugated culvert has a smooth and flat surface, 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, small-size fasteners, etc.