Surface treatment method of straight seam steel pipe

Long-distance oil and gas pipelines are an important way to ensure energy. In the anti-corrosion construction process of oil and gas pipelines, the surface treatment of straight seam steel pipes is one of the key factors that determine the anti-corrosion service life of the pipeline. It is the premise of whether the anti-corrosion coating can be firmly combined with the steel pipe. Research shows that the service life of the anti-corrosion coating depends on the coating. Layer type, coating quality and construction environment, the effect of surface treatment of straight seam steel pipe on the life of anti-corrosion coating is about 50%. Therefore, the surface treatment methods of steel pipes should be continuously explored and summarized in strict accordance with the requirements of the anti-corrosion coating specifications on the surface of steel pipes.

The surface treatment methods of straight seam steel pipes are mainly as follows:

1. The cleaning of straight seam steel pipes uses solvents and emulsions to clean the steel surface to remove oil, grease, dust, lubricants and similar organic matter, but cannot remove oxide scale, rust on the steel surface, flux, etc., and can only be used as anti-corrosion production Auxiliary means.

2. If the steel surface is firmly attached to the iron oxide scale, its rust removal effect is not ideal, and it cannot meet the requirements of anti-corrosion construction for anchoring particle depth. Straight seam steel pipe rust removal tools mainly use steel wire brushes and other tools to polish the steel surface. Manual rust removal can reach SA2 level, and power tool rust removal can reach SA3 level, which can remove loose or raised oxide scale, rust, and welding slag. Wait.

3. The pickling of straight seam steel pipes is generally treated by chemical and electrolytic methods, which can be used as reprocessing after sandblasting and rust removal. Although chemical cleaning can make the surface clean and rough to a certain degree, its anchoring particles are relatively shallow. It is easy to cause pollution to the environment. Pipeline anticorrosion can only be treated with chemical pickling, which can remove oxide scale, rust and old coatings.


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