The first anti-corrosion of steel corrugated culverts is hot-dip galvanizing. The theoretical service life of hot-dip galvanizing is about 100 years. In order to achieve a better anti-corrosion effect, we spray asphalt inside and outside the pipe wall, which is secondary anti-corrosion. Secondary anti-corrosion should be applied twice with a mixture of asphalt and petroleum. From the appearance, the inside and outside of the pipe wall are evenly painted into a black pipe, but it must be installed after the asphalt is dried. The thickness of the asphalt coating is kept within 0.4mm-0.5mm. 

The painting method is as follows: 
1: Thick asphalt coating containing asbestos fiber: The solvent of the coating is high-quality asphalt, and the content of asbestos powder is greater than or equal to 30%. The spraying method can be sprayed with air pressure or brushed with a brush. The thickness of each spray layer is 7mm-8mm, and the spraying amount is about one kilogram per square meter. The surface of the sprayed object should be particularly dry and free of oil stains, apply to the corrugated culvert soaked in wastewater or below the normal water level.

2. Asphalt and kerosene mixture coating: The ratio of asphalt and kerosene is 54:46. When using this coating, it should be brushed twice to make the total thickness of the coating layer reach 0.4mm--0.5mm, and the amount of coating is 0.6 kg per square meter. If conditions permit, spraying with a spray gun will have a better effect, apply it on the corrugated culverts that are soaked in wastewater or below the normal water level.

Answers

• 
  What are the differences in thickness and production process between medium and thick steel plates and hot rolled steel plates? 20/12/2024 16:13:18
• 
  What are the differences between PE lining and plastic coating? 04/12/2024 17:18:59
• 
  What are the acceptance criteria for hot-dip galvanized square tubes? 03/12/2024 05:26:54
• 
  How to distinguish between 304 and 201 stainless steel plates? 29/11/2024 17:07:20
• 
  Stainless steel wire rope or galvanized steel wire rope, which one is stronger? 27/11/2024 15:03:48