Pipeline anti-corrosion method Coating anti-corrosion

A commonly used pipeline anti-corrosion method with pipeline anti-corrosion tape is coating anti-corrosion. What is coating corrosion protection?

　　 Coating evenly and densely on the surface of the rust-removed metal pipeline with paint to isolate it from various corrosive media is one of the most basic methods for pipeline anti-corrosion. Since the 1970s, laying pipelines in harsh environments such as polar regions and oceans, as well as increasing the temperature of the pipelines due to heating and transportation of oil, have put forward more requirements on coating performance. Therefore, pipeline anticorrosion 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 range of temperature adaptation.

1. Outer wall anti-corrosion coating: the type and use conditions of the outer wall coating material of the pipeline.

2. Inner wall anti-corrosion coating: In order to prevent corrosion in the pipe, reduce friction resistance, and increase the throughput, the film is applied to the inner wall of the pipe. Commonly used coatings are amine cured epoxy resin and polyamide epoxy resin, and the thickness of the coating is 0.038 to 0.2 mm. In order to ensure a firm bond between the coating and the pipe wall, the inner wall of the pipe must be surface treated. Since the 1970s, there has been a tendency to use the same material for the inner and outer walls of the tube so that the inner and outer walls of the tube can be coated at the same time.

3. Anti-corrosion and thermal insulation coating: In order to reduce the heat dissipation of the pipeline to the soil on medium and small diameter pipelines that transport crude oil or fuel oil, a composite layer of insulation and anti-corrosion is added to the outside of the pipeline. The commonly used thermal insulation material is rigid polyurethane foam, the applicable temperature is -185～95℃. This material has a soft texture. In order to improve its strength, a high-density polyethylene layer is added to the outside of the heat insulation layer to form a composite material structure to prevent groundwater from penetrating into the heat insulation layer.