Long-distance oil and gas pipelines are an important means of energy security. During the anti-corrosion construction process of oil and gas pipelines, the surface treatment of straight seam steel pipes is a key factor in determining the anti-corrosion service life of the pipeline. It is the prerequisite for whether the anti-corrosion layer and the steel pipe can be firmly combined. It has been verified by research institutions that, in addition to factors such as coating type, coating quality, and construction environment, the surface treatment of straight seam steel pipes accounts for about 50% of the impact on the life of the anti-corrosion layer. Therefore, the anti-corrosion layer should be strictly followed Standardize the requirements for the surface of steel pipes, continuously explore and summarize, and continuously improve the surface treatment methods of steel pipes.
1. Pickling of straight seam steel pipes generally uses acid and electrolysis treatments. Pipe anticorrosion is just chemical pickling that removes scale, rust, and old coatings. Sometimes it can be used for sandblasting and rust removal. Reprocessing. Although chemical cleaning can achieve a certain degree of cleanliness and roughness, its anchoring pattern is shallow and can easily pollute the environment.
2. Cleaning of straight seam steel pipes uses solvents and emulsions to clean the surface of the steel to remove oil, grease, dust, lubricants, and similar organic matter, but it cannot remove rust, scale, flux, etc. on the steel surface, so it is retained. Produced for aid only.
3. Straight seam steel pipe corrosion tools mainly use tools such as wire brushes to polish the steel surface, which can remove loose or raised rust, rust slag, welding slag, etc. The rust removal of hand tools can reach the Sa2 level, and the rust removal of electric tools can reach the Sa3 level. If there is a strong oxide scale attached to the steel surface, the rust removal effect of the tool will not be ideal and the anchoring depth required for anti-corrosion structures will not be achieved.
Post time: Jan-30-2024