Inner epoxy powder anti-corrosion steel pipe

 

 

The utility model relates to a anticorrosive tube, which belongs to inner epoxy powder and outer three-layer PE composite coating anticorrosive tube.

Technical background

In order to ensure the requirements of buried environment and the special needs of transmission media, to improve the use of buried pipe in different environments and different media and extend its service life, the general use of steel pipe coating the outer wall of the practice. At present the use of steel pipe outside the three-tier anti-corrosion coating of steel pipe corrosion in the field of steel pipe the most extensive use of epoxy coating on the steel powder layer, winding the middle of the adhesive and the outer layer of polyethylene, is an optimal coating of steel pipe. The inner wall is coated with a liquid epoxy coating.

The inner coating adopts liquid epoxy coating, which can meet the requirement of drag reduction and anticorrosion in the pipe, but it is the room temperature curing coating. It is low in chemical bond with the steel pipe matrix. Under the long-term running condition, Off, resulting in defects in steel pipe. Epoxy powder as an excellent performance of the anti-corrosion coating, at high temperature and excellent combination of steel pipe base, and good leveling, is the best medium pipe coating coating. Outside the pipe outer three layers of PE coating and epoxy powder coating, is to meet the pipeline inside and outside the best combination of corrosion coating.

In order to overcome the defects of the liquid epoxy coating anticorrosive pipe in the existing outer three-layer PE, the utility model provides an inner epoxy powder and outer three-layer PE composite coating anticorrosive tube. The anti-corrosion pipe has a good effect under the external anti-corrosion coating to improve anti-corrosion drag reduction effect, to extend the service life of steel pipe.

The technical scheme adopted by the utility model is that:

An inner epoxy powder and an outer three-layer PE composite coating anticorrosive tube. The outer surface of the steel pipe is covered with an epoxy powder coating layer of 80 to 150 m, an intermediate adhesive coating of 175 to 250 m and a polyethylene coating of 1.5 to 3 mm , The inner surface of the steel pipe coated with 80 ~ 400μm epoxy powder coating layer.

The utility model has the beneficial effects that:

The outer wall of the steel pipe is sprayed with epoxy powder, the middle adhesive tape and the polyethylene tape. The inner surface of the steel pipe is coated with the epoxy powder coating layer, and the curing and leveling effect is good at high temperature. The anticorrosion effect of the outer anticorrosive steel pipe is improved under the precondition of the utility model, and the anti-corrosion drag reduction effect of the pipe is improved. Its performance is much higher than the outer three layers of PE liquid epoxy anticorrosive pipe and other liquid coating anti-corrosion pipe.

An inner epoxy powder and an outer three-layer PE composite coating anticorrosive tube. The steel pipe is treated by degreasing, degreasing and water treatment, etc., and is cleaned by shot peening technology to remove corrosion material on the outer wall of pipe, Technology to remove the pipe wall rust, etc., and then use intermediate frequency or other means of heating steel 1 to 200 ~ 230 ℃, the use of air powder or electrostatic spraying technology will be sprayed epoxy powder coating on the inner wall of steel pipe 1, the thickness of 300μm melting epoxy powder Coating 5, the steel pipe into the three-tier PE forming institutions, and the use of epoxy coating and epoxy coating of the curing time difference between the full flow of the inner powder, again with intermediate frequency or other means of heating steel 1 to 180 ~ 220 ℃ , Accelerating the inner powder solidification, the epoxy powder coating layer 5 and the steel pipe 1 are tightly combined to enhance the anticorrosion and drag reduction effect of the steel pipe 1. At the same time, under the heating condition of the steel pipe 1, the epoxy powder coating is sprayed on the epoxy powder coating An epoxy powder coating 2 having a thickness of 110 m was formed by melting and forming an epoxy adhesive coating 3 of 200 m and a 2.0 mm polyethylene coating 4 formed by winding in an epoxy powder coating layer 2, Forming a dense protective shell.

As the inner surface of the steel pipe coated with epoxy powder, the outer surface coated with three PE coating, the use of the molding process of internal and external epoxy coating performance differences, enhance the internal and external epoxy coating and steel substrate adhesion, Anti-corrosion, anti-corrosion and anti-corrosion performance, its anti-corrosion, drag reduction performance is much higher than the outer three-layer PE coating and the liquid epoxy coating anti-corrosion steel pipe to extend the service life of steel pipe. In ensuring the excellent performance of external corrosion of steel pipe under the premise of increasing the erosion of the steel pipe wall and the ability of anti-corrosion.