How to effectively prevent rust when carbon steel pipes are directly buried?

Principles and methods of rust prevention for direct buried carbon steel pipes:

Carbon steel pipes are easily affected by the external environment during direct burial, such as water, sand, stone and other substances, as well as gases such as oxygen and carbon dioxide, which can cause rust. In order to extend the service life of carbon steel pipes, rust prevention must be taken. The principle of rust prevention is to form a protective layer on the surface of the carbon steel pipe to prevent further rust. The specific rust prevention methods are as follows:

1. Choose anti-rust primer
Anti-rust primer is the basis of anti-rust treatment. Primers such as phenolic, epoxy, and chlorinated rubber can be selected as needed. Primers can fill pores, enhance adhesion and sealing, and improve the anti-corrosion and mechanical properties of the coating.

2. Surface treatment

Surface treatment is the key to rust prevention. The surface of the carbon steel pipe must undergo rust removal, oil removal, dust removal and other treatment steps to ensure the cleanliness and smoothness of the base layer, enhance the adhesion between the primer and the surface, and ensure the quality and service life of the coating.

3. Apply anti-corrosion paint
The purpose of applying anti-corrosion paint is to increase the anti-corrosion performance of the coating and improve the service life of carbon steel pipes. Anti-corrosion paint generally uses chlorinated rubber, epoxy, polyurethane and other coatings, which have the advantages of high gloss, water resistance, acid resistance, heat resistance and corrosion resistance.

4. Testing
Testing is an important part of anti-rust treatment. Testing requires that the thickness and adhesion of the coating meet the specified standards, and quality testing and effect evaluation are carried out to ensure the effect of anti-rust treatment.

Precautions for direct buried anti-rust treatment of carbon steel pipes:

1. Select suitable anti-rust primer and anti-corrosion paint.
2. The surface treatment must be thorough, rust, oil and dust removal to ensure the cleanliness and smoothness of the base layer.
3. Before applying the paint, the primer must be completely dried, otherwise it will affect the adhesion of the anti-corrosion paint.
4. The thickness of the anti-corrosion paint should meet the specified standards to ensure its corrosion resistance.
5. Detect the thickness and adhesion of the coating to ensure the effect of the anti-rust treatment.

Common application areas of carbon steel pipes:

1. Petroleum field
In the petroleum field, carbon steel pipes are mainly used for oil well pipes, oil and gas transmission pipes, oil field casing pipes, etc. Carbon steel pipes can resist corrosion and withstand high pressure, which can ensure the safety and stability of oil and gas transportation.

2. Chemical field
In the chemical field, carbon steel pipes are usually used to transport liquids or gases. Because carbon steel pipes are corrosion-resistant, high-temperature-resistant, and withstand high pressure, they can be used in harsh environments. For example, in traditional high-temperature refining units, high-pressure and high-temperature pressure-bearing carbon steel pipes are often used.

3. Aviation field
In the aviation field, carbon steel pipes are generally used to manufacture various pipelines and brackets on aircraft. Because carbon steel pipes have the characteristics of light weight, high strength, and good ductility, they can meet the requirements of aircraft structures for high strength and lightweight materials.

4. Nuclear energy field
In the nuclear energy field, carbon steel pipes are mainly used to manufacture steam pipes in nuclear power plants. Carbon steel pipes can withstand high temperature and high pressure environments, resist radiation corrosion, and meet the requirements of nuclear power plants for high strength and high durability of materials.

5. Construction field
In the construction field, carbon steel pipes are mainly used in building structures, highway bridges, offshore platforms and other fields. Carbon steel pipes have the characteristics of low cost, high tensile strength and good processability, which can meet the requirements of material strength, service life and cost in the construction field.

The above content introduces the principles, methods, precautions and common application fields of direct buried carbon steel pipe anti-rust treatment. In actual work, the operation should be strictly carried out in accordance with the requirements to improve the anti-rust effect, protect the carbon steel pipe and extend its service life.

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