The anticorrosion of steel pipe is the key procedure to ensure and extend its service life. In order to ensure that the anticorrosive insulation layer is firmly combined with the pipe wall, the rust removal of the steel pipe is the most important.

Generally, rust on the surface of steel pipe can be divided into floating rust, medium rust and heavy rust according to the delivery time, storage and transportation conditions, and humidity degree.

Floating rust: generally, there is only a small amount of thin rust on the surface of the steel pipe when it is not stored in the open air, and it can be exposed to metallic luster by manual operation such as wire brush, sandpaper and cotton yarn.

Medium rust and heavy rust: when it is stored in the open air or transported for many times and transported for a long time, the surface of the steel pipe will be oxidized and rusted, with heavy rust spots, or the oxide skin will fall off in serious cases.

The severely rusted steel pipes are not suitable for the sub water conveyance system. When the medium rusted pipes are in large quantities, the rust remover or mechanical sandblasting can be used for mechanical rust removal, which can improve the labor efficiency and reduce the pollution to the air.

When the anti-corrosion quality is required to be high or the inner and outer walls of the steel pipe are rusted, the chemical rust removal method can be used to effectively remove the oxide on the inner and outer surfaces of the steel pipe.

No matter which method is adopted for derusting, anti-corrosion treatment shall be carried out immediately after derusting to prevent the steel pipe from being oxidized and corroded by air again.