Knowledge of spiral steel pipe surface treatment

By Published On: May 13th, 2023Categories: Pipe Knowledge0 Comments
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In the anticorrosive construction process of oil (gas) pipeline, the surface treatment of anticorrosive spiral steel pipe determines the service life of the pipeline, one of the key factors is the premise that the anticorrosive layer can be firmly combined with the steel pipe. According to the research validation, the life of the anti-corrosion coating depends on the type of coating, coating quality and construction environment. The effect of surface treatment on the life of anticorrosive spiral steel pipe is about 50%. Therefore, it should be carried out in strict accordance with the anticorrosive layer. Specification of the steel pipe surface requirements, constantly explore and summarize, and constantly improve the steel pipe surface treatment methods.

What should be done on the surface of high-frequency anti-corrosion spiral steel pipe?

1, cleaning

Use solvent and emulsion to clean the surface of steel to remove oil, grease, dust, lubricant and similar organic matter, but it can not remove rust, scale, flux, etc. on the surface of steel pipe, so it is only used as an auxiliary means in anti-corrosion production of steel pipe. .

2, tool rust removal

The surface of the steel pipe is mainly polished by using a wire brush or the like to remove loosened or lifted scale, rust, welding slag, and the like. The rust removal of the hand tool can reach the Sa2 level, and the rust removal of the power tool can reach the Sa3 level. If the surface of the steel material is adhered to the iron oxide scale, the rust removal effect of the tool is not ideal, and the anchor depth required for the anti-corrosion construction cannot be achieved.

3, pickling

Generally, chemical cleaning and electrolysis are used for pickling treatment. Anticorrosive spiral steel pipe is only treated with chemical pickling, which can remove scale, rust and old coating, and can sometimes be used as re-treatment after sandblasting and rust removal. Although chemical cleaning can achieve a certain degree of cleanliness and roughness, its anchor pattern is shallow and it is easy to pollute the environment.

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