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The corrosion prevention of steel pipe is closely related to the service life of pipe
2019-10-28
The anticorrosion of buried steel pipe is the key procedure to ensure and extend its service life. In order to ensure the anti-corrosion insulation layer and the tube wall binding firm. The removal of rust from pipes is the key.
Generally according to the factory time, storage transportation conditions, humid climate. The surface rust of American standard steel pipe can be divided into floating rust, medium rust and heavy rust.
Floating rust: Generally, there is only a small amount of thin rust on the surface of the pipe when it is stored in the non-open air with a short manufacture date. It can use wire brush, sandpaper and cotton yarn and other manual operations that show metallic luster.
Medium rust and heavy rust: When the manufacture date is longer and the storage in the open air or multiple transportation and transportation distance is longer, oxidation rust will appear on the surface of the pipe, and the rust spot will be heavier, and the oxide skin will fall off in severe cases.
Heavily rusted pipes are not suitable for water delivery systems. For medium rust pipe and a large batch, the use of derusting machine or mechanical sandblasting method for mechanical derusting. It can improve labor efficiency and reduce the pollution of people and air.
When the quality of anticorrosion is higher or the inner and outer walls of the pipe are corroded, chemical derusting method can be used to effectively remove the oxide on the outer surface of the pipe.
No matter which method is used to remove rust, it should be treated immediately with an embalming coating, avoid re-exposure to air oxidation and corrosion.
