First, Mechanical Cleaning Methods for Carbon Steel Pipes.
Mechanical cleaning is a relatively traditional and direct method, mainly utilizing physical friction to remove rust and dirt.
1. Wire Brush Cleaning: Select an appropriately sized wire brush, hold it firmly, and scrub the inner wall of the carbon steel pipe vigorously until the rust is completely removed. This method is simple and direct, but care must be taken to avoid potential wear on the inner wall of the carbon steel pipe. It is suitable for small carbon steel pipes or localized cleaning.
2. Shot Blasting and Sandblasting for Carbon Steel Pipes: For larger diameter carbon steel pipes, shot blasting or sandblasting techniques can be used. High-speed jets of steel shot or sand impact the inner wall of the carbon steel pipe, effectively removing rust and dirt. These two methods are efficient and thorough, but require specialized equipment.

Second, Chemical Cleaning Methods for Carbon Steel Pipes.
Chemical cleaning utilizes chemical agents to react with the rust, achieving the purpose of dissolving or transforming it.
1. Acidic Rust Removers: Common acidic rust removers include dilute hydrochloric acid and dilute sulfuric acid, which can quickly dissolve rust. When using them, pour the rust remover into the carbon steel pipe, let it stand for a period of time, and then rinse it thoroughly with water. Safety precautions must be taken to avoid harm to humans and the environment.
2. Alkaline Rust Removers: Unlike acidic rust removers, alkaline rust removers, such as sodium hydroxide and potassium hydroxide, convert rust into water-insoluble substances through a chemical reaction. Similarly, safety must be ensured during use, and the pipe must be thoroughly rinsed.
3. Electrochemical Cleaning of Carbon Steel Pipes: Electrochemical cleaning utilizes electrochemical principles, applying an electric current to cause an oxidation reaction at the anode, thus removing rust.

Third. Electrochemical rust removal for carbon steel pipe:
This method does not cause physical wear to the inner wall of the carbon steel pipe and can remove rust relatively thoroughly. However, it requires specialized equipment and technical support and is suitable for large-scale or severe rust treatment.

Fourth. Auxiliary Measures and Comprehensive Application for Carbon Steel Pipes.
In addition to the main cleaning methods mentioned above, some auxiliary measures can improve the cleaning effect.
1. Preventive Measures: Regularly clean and maintain carbon steel pipes, using rust inhibitors or coatings to protect the surface, reducing contact with oxygen and water, and preventing rust formation.
2. Carbon Steel Pipe Cleaning and Maintenance: Regularly clean carbon steel pipes to reduce the accumulation of rust and dirt. Simultaneously, strengthen inspections and maintenance to promptly identify and repair internal problems.
3. Innovative Cleaning Technology: For example, using telescopic rods in conjunction with ring-shaped water spray pipes, first use organic solvents to initially clean the inner wall of the carbon steel pipe of oil stains, then perform physical wiping and water washing, and finally dry and seal both ends of the carbon steel pipe to ensure the inner wall of the pipe is dry and clean.

Cleaning the inner wall of carbon steel pipes is a crucial step in ensuring the normal operation of the steel industry. By rationally selecting and applying various methods such as mechanical cleaning, chemical cleaning, and electrochemical cleaning, combined with preventive and auxiliary measures, cleaning work can be completed efficiently, safely, and environmentally friendly.