Why does steel pipe rust? How to remove rust?

Steel pipe is closely related to human life and production activities. The production technology of the steel pipe industry not only develops rapidly, but also brings forth new ideas through the old. Steel pipe production occupies an irreplaceable position in the steel industry.
Steel pipes are indispensable for daily appliances, furniture, water supply and drainage, gas supply, ventilation, and heating facilities, as well as for the manufacturing of various agricultural machinery appliances, the development of underground resources, national defense, aerospace, and rockets. “Our daily production and life cannot be separated from steel pipe materials, but the amount of steel pipe lost due to corrosion every year in the world is very large.”. Therefore, how to protect steel pipes from corrosion is of great significance.
Steel pipe rust requires the participation of water and oxygen. The corrosion process of steel pipe products is a complex chemical reaction process. Rust is usually reddish brown, and different forms of rust can be formed under different circumstances. Rust is mainly composed of hydrates of iron oxide (Fe2O3 · nH2O) and iron hydroxide [Fe (OH) 3]. The rust structure on the surface of the steel pipe is loose and cannot prevent the internal iron from contacting with oxygen, water vapor, etc., ultimately causing all the steel pipes to rust.
The commonly used rust removal methods for steel pipes can be divided into physical methods and chemical methods. The physical method mainly uses grinding to remove rust, such as sanding with abrasive paper, grinding wheels, wire brushes, and steel balls. Chemical methods mainly utilize the chemical reaction between acid and rust to achieve the purpose of rust removal.
In fact, just isolating steel pipe products from water and oxygen can prevent steel corrosion. Therefore, the simplest way to prevent iron rust is to keep the surface of steel pipe products smooth, clean, and dry. Preventing steel from rusting can also form a protective layer on its surface, such as oiling, painting, firing enamel, and spraying plastic.

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