The anticorrosion of buried steel pipes is the key procedure to ensure and prolong their service life. In order to ensure that the anticorrosive insulation layer is firmly combined with the pipe wall, the most important thing is the derusting of the pipeline. Generally, the rust on the surface of the steel pipe can be divided into floating rust, medium rust and heavy rust according to the factory time, storage and transportation conditions, and the degree of climate humidity. Floating rust; when the delivery date is relatively short, there is only a small amount of thin rust on the surface of the tube when it is not stored in the open air. The metal luster can be exposed by manual operations such as wire brush, sandpaper and cotton yarn.
Medium rust and heavy rust: When the factory date is long and the open storage or multiple transfers and transportation are long, the surface of the tube is oxidized and rusted, and the rust spots are heavy. In severe cases, the scale is peeled off. Severely corroded pipelines are not suitable for sub-water delivery systems. For medium rust pipes and large batches, rust removal machines or mechanical sandblasting can be used for mechanical rust removal, which can improve labor efficiency and reduce pollution to people and air. .
When high corrosion resistance is required or the inner and outer walls of the pipe have been corroded, chemical derusting can be used to effectively remove the oxides on the inner and outer surfaces of the pipe. No matter which method is used to remove rust, the anticorrosion layer should be treated immediately after the rust is removed to avoid being oxidized and corroded by air again.
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