According to the research institutions to verify that the life of the coating depends on the type of coating, coating quality and construction environment and other factors, the surface treatment of alloy pipe on the life of the coating about 50%, therefore, should be strictly in accordance with the Code On the surface of the alloy elbows requirements, continue to explore and summarize, and constantly improve the surface treatment methods of alloy elbows.
1, cleaning of alloy elbows
The use of solvents, emulsions to clean the surface of steel to achieve the removal of oil, grease, dust, lubricants and similar organic matter, but it can not remove the steel surface rust, oxide, welding, etc., so in the anti-corrosion production only as an auxiliary means.
2, The surface of the alloy elbows derusting
Mainly the use of steel wire brush and other tools to polish the steel surface, you can remove loose or tilt of the oxide, rust, welding slag and so on. Manual tool derusting can reach Sa2 level, power tools rust can reach Sa3 level, if the steel surface attached to a solid iron oxide skin, tool rust effect is not ideal, not up to the requirements of anti-corrosion construction of the anchor depth
3, The pickling of the alloy elbows
General use of chemical and electrolytic two methods for pickling treatment, pipeline corrosion only chemical pickling, you can remove the oxide, rust, the old coating, and sometimes can be used as a blasting and then re-treatment. Chemical cleaning, although the surface can achieve a certain degree of cleanliness and roughness, but the anchor is shallow, and easy to cause pollution to the environment.
4, The spray (throw) shot rust of alloy elbows
Spray (throw) shot rust is driven by high-power motor spray (throw) shot high-speed rotation of the blade, steel sand, steel balls, wire segments, minerals and other abrasives in the centrifugal force on the surface of the alloy fittings spray (throw) , Not only can completely remove the rust, oxides and dirt, and the steel pipe in the abrasive impact and friction under the action, but also to achieve the required uniform roughness.