How are large-diameter anti-corrosion steel pipes protected against corrosion?
Release time:
2020-10-23
Coating-based corrosion protection is generally the primary method used for corrosion prevention in large-diameter anti-corrosion steel pipes. If you’d like to learn more about the anti-corrosion coatings used for large-diameter anti-corrosion steel pipes, be sure not to miss the following information. Coating-based corrosion protection for large-diameter anti-corrosion steel pipes involves evenly applying a layer of paint onto the surface of rusted metal pipes, thereby isolating them from various corrosive media. This is one of the most fundamental methods for steel pipe corrosion prevention. Thanks to technological advancements, an increasing number of large-diameter anti-corrosion steel pipes now employ composite materials or composite structures as their anti-corrosion coatings. These materials and structures offer superior dielectric and physical properties compared to conventional materials, ensuring greater stability.
Coating-based corrosion protection is generally the primary method used for large-diameter anti-corrosion steel pipes. If you’d like to learn more about the anti-corrosion coatings used for large-diameter anti-corrosion steel pipes, be sure not to miss the following information.
Coating-based corrosion protection for large-diameter anti-corrosion steel pipes involves evenly applying a layer of paint onto the surface of rusted metal pipes to isolate them from various corrosive media. This is one of the most fundamental methods for steel pipe corrosion prevention. Thanks to technological advancements, an increasing number of large-diameter anti-corrosion steel pipes are using composite materials or composite structures as their corrosion-resistant coatings. These materials and structures offer superior dielectric properties, physical performance, stable chemical characteristics, and broad temperature adaptability compared to conventional materials.
To prevent corrosion inside pipelines, reduce frictional resistance, and increase production, a coating is applied to the inner walls of the pipelines. Generally, amine-cured epoxy resins and polyamide epoxy resins are used as anticorrosive materials, with typical coating thicknesses ranging from 0.038 to 0.2 millimeters. The inner surfaces of the pipelines must undergo surface treatment to ensure that the coating adheres firmly to the pipe walls. Since the 1970s, there has been a trend toward using the same materials for both interior and exterior coatings, allowing interior and exterior coatings to be applied simultaneously.
To reduce heat loss from large-diameter corrosion-resistant steel pipes to the surrounding soil in small- and medium-diameter pipelines transporting heated crude oil or fuel oil, an insulating and anticorrosive composite layer is typically added externally to the pipeline. Rigid polyurethane foam, which has a soft texture and can operate effectively over a temperature range of -185°C to 95°C, is commonly used as the insulation material. At the same time, to enhance its strength, a high-density polyethylene layer is usually added on the outer side of the insulation layer, forming a composite structure that prevents groundwater from seeping into the insulation.
If the outer protective pipe of a large-diameter anti-corrosion steel pipe is made of polyethylene, corrosion protection is generally not required. Polyethylene is characterized by being odorless and non-toxic, with a wax-like feel to the touch. It also exhibits excellent low-temperature resistance—its minimum operating temperature can reach as low as -70 to -100 degrees Celsius. Moreover, polyethylene boasts good chemical stability, enabling it to withstand erosion by most acids and bases (it is antioxidant). At room temperature, it is insoluble in commonly used solvents, has a low water absorption rate, and—despite being composed of linear molecules—can slowly dissolve in certain organic solvents without swelling. Additionally, it possesses outstanding electrical insulation properties.
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