With the continuous development of China's economy, the country vigorously develops the energy industry. Pipeline long-distance oil and gas pipelines are an important way of energy security. In the anti-corrosion construction process of oil (gas) pipelines, the surface treatment of anti-corrosion spiral steel pipes determines the service life of pipelines. One of the key factors is the premise that the anti-corrosion layer and the steel pipe can be firmly combined. According to the research institute's verification, the life of the anti-corrosion layer depends on the coating type, coating quality and construction environment. The surface treatment of the anti-corrosion spiral steel pipe affects the life of the anti-corrosion layer by about 50%. Therefore, it should be strictly in accordance with the anti-corrosion layer. Standardize the requirements on the surface of steel pipes, continuously explore and summarize, and continuously improve the surface treatment methods of steel pipes. 

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.