Anti-corrosion treatment methods for welded steel pipes

Anti-corrosion treatment methods for welded steel pipes:

1. Spray painting method
Spray painting is a commonly used anti-corrosion method for welded steel pipes. Using a paint spray machine to spray special anti-corrosion paint on the surface of the steel pipe can protect the surface of the steel pipe from corrosion. The spray painting method has the advantages of convenient construction, economical and practical, and remarkable effects. However, its disadvantage is that it is easily affected by climate and external environmental factors, and the anti-corrosion effect is not very lasting.

2. Hot dip galvanizing method

Hot-dip galvanizing is also a commonly used anti-corrosion method for welded steel pipes. It uses zinc to form a galvanized layer on the surface of the steel pipe to prevent the steel pipe from rusting. Hot-dip galvanizing has the advantages of good anti-corrosion effect and long service life, but the disadvantage is higher cost.

3. Zinc spraying method
The zinc spray method is an emerging anti-corrosion method for steel pipes in recent years. It uses a sandblasting machine to spray zinc spray materials on the surface of the steel pipe to form a zinc-iron alloy layer and a pure zinc layer, which can effectively prevent the steel pipe from rusting. The zinc spray method has the advantages of good anti-corrosion effect and low cost, but it requires subsequent treatment to extend the service life of the steel pipe.

4. Welding seam treatment
The weld is an important source of corrosion in steel pipes. Therefore, when welding steel pipes, special anti-corrosion treatment is required for the weld. Generally, brushing, spraying, coating and other methods are used to carry out anti-corrosion treatment on welds to protect the service life of steel pipes.

Selection and use of anti-corrosion materials for welded steel pipes:

Anti-corrosion of welded pipes is to prevent the pipes from being corroded during use, thereby reducing the service life of the pipes. Commonly used anti-corrosion materials for welded pipes mainly include the following:
1. Polyethylene (PE): It has good corrosion resistance and is widely used in natural gas, city gas, water supply, industrial water pipelines and other fields.
2. Polypropylene (PP): Resistant to chemical corrosion, suitable for various chemical medium pipelines and chemical industry pipelines. However, its corrosion resistance is weak and it is not suitable for medium pipelines such as strong acid and strong alkali.
3. Epoxy fiberglass anti-corrosion layer (FBE): It has good corrosion resistance and is widely used in petroleum, natural gas, chemical industry, urban water supply and drainage, marine engineering, heating and other fields.

How to choose suitable anti-corrosion materials for welded steel pipes?

1. Selection of pipeline usage environment: Different materials have different adaptability to different environments. For example, in a salt water environment, materials with better corrosion resistance to salt water should be selected.
2. Selection of medium characteristics: Medium characteristics are also an important factor in selecting anti-corrosion materials for welded pipes. For example, media such as strong acid and strong alkali are highly corrosive to some materials, so materials with strong corrosion resistance need to be selected.
3. Pipe shape selection: Pipes of different shapes require different anti-corrosion material treatment methods. For example, pipe elbows, tees, etc. need to be coated with water-blocking glue.

In summary, welded steel pipes require anti-corrosion treatment during use. Choosing appropriate anti-corrosion methods can greatly extend the service life of steel pipes. At the same time, attention should be paid to techniques during construction to ensure the durability and reliability of the anti-corrosion treatment effect.

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