Anti-corrosion steel pipe is widely used in oil, natural gas, urban gas, urban water supply, coal water slurry pipelines and other fields. According to different needs, the inner and outer walls of the steel pipe can also take corresponding anti-corrosion measures. Such as liquid epoxy coating anti-corrosion, fused epoxy powder anti-corrosion. It has the characteristics of corrosion resistance, no leakage, high toughness. And it also has the characteristics of excellent flexibility, good scratch resistance and good rapid cracking resistance.
Operation and Maintenance
First of all, before it is installed and used, a comprehensive inspection should be carried out to ensure that the coating or protective layer is not damaged, no peeling and other defects. In the process of use, regular inspection and maintenance should be carried out to find and deal with coating damage, rust and other problems in time.
Secondly, its use environment should be kept as dry and clean as possible to avoid long-term immersion in water or exposure to wet environments. At the same time, avoid contact with highly corrosive media to avoid damage to the coating or protective layer.
In addition, the welding, connection and other operations of anti-corrosion steel pipe should be carried out in strict accordance with the relevant specifications and operating procedures to avoid damage to the coating or protective layer. After the welding is completed, the necessary anti-corrosion treatment should be carried out on the weld to ensure that the anti-corrosion performance of the weld is consistent with the overall steel pipe.
Finally, for the steel pipe that has corrosion problems, repair measures should be taken in time, such as recoating, recoating, etc., to restore its corrosion resistance. At the same time, for the serious corrosion parts that cannot be repaired. They should be replaced in time to avoid causing security risks to the entire system.
Coating of Anti-corrosion Steel Pipe
1. Grease coating: drying oil is the main film forming material. It is characterized by good brushing, good wettability to the surface, and flexible paint film. But the paint film drying slow, poor mechanical properties, acid and alkali resistance, water resistance and organic solvent resistance is also weak.
2. Raw lacquer (national lacquer) : The milky white viscous liquid that flows from the bark of the lacquer tree. When applied to the surface of the object, the color will change rapidly, and eventually form a hard and bright black paint film. It has strong adhesion, tough film, good luster, soil corrosion resistance, water resistance, oil resistance. However, it should be noted that raw paint is toxic, easy to make people’s skin allergic. And it is not resistant to strong oxidants and alkalis.
3. Phenolic resin coating: including alcohol-soluble phenolic resin, modified phenolic resin and pure phenolic resin. The alcohol-soluble phenolic resin coating has good corrosion resistance, but it is inconvenient to operate. Pure phenolic resin coating has strong adhesion, water and heat resistance, corrosion resistance and good weather resistance.
4. Epoxy resin coating: good adhesion, excellent adhesion to a variety of materials such as metal, concrete, wood, glass, etc. It is resistant to alkali, oil and water. And it has excellent electrical insulation performance, but its aging resistance is slightly poor.
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