Coating anticorrosion is a uniform and dense coating formed on the surface of de-rusting steel pipes, which can isolate it from various corrosive media. Steel pipe anti-corrosion coatings are increasingly using composite materials or composite structures. These materials and structures must have good dielectric properties, physical properties, stable chemical properties, and a wide temperature range.

Exterior wall anti-corrosion coatings: Types and application conditions of exterior wall coatings for steel pipes. Inner wall anti-corrosion coating This film is applied to the inner wall of steel pipes to avoid corrosion of steel pipes, reduce frictional resistance, and increase dosage. Commonly used coatings are amine-cured epoxy resin and polyamide epoxy resin, and the coating thickness is 0.038 to 0.2 mm. Ensure that the coating is firmly bonded to the steel pipe wall.

Surface treatment must be carried out on the inner wall of the steel pipe. Since the 1970s, the same material has been used to coat the inner and outer walls of steel pipes, making it possible to coat both the inner and outer walls of steel pipes at the same time. Anti-corrosion and thermal insulation coatings are used on small and medium-diameter heat transfer crude oil or fuel oil steel pipes to reduce heat dissipation from steel pipes to the soil.

A composite layer of thermal insulation and anti-corrosion is added to the outside of the steel pipe. The commonly used heat insulation material is rigid polyurethane foam, and the applicable temperature is that this material is soft. To increase its strength, a layer of high-density polyethylene is applied on the outside of the insulation to form a composite structure to prevent penetration of open water into the insulation