Hebei ChongSheng Special Steel Pipe Co.,Ltd.
1, cleaning
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 anti-corrosion production only as an auxiliary means.
2, the tool rust
Mainly use steel wire brush and other tools to polish the surface of steel, 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, pickling
General use of chemical and electrolytic two methods for pickling treatment, pipeline corrosion only use chemical pickling, you can remove the oxide, rust, the old coating, and sometimes can be used as a blasting after the 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, spray (throw) shot rust
Spray (throw) shot rust is driven by high-power motor spray (throw) shot high-speed rotation of the blade, so that steel sand, steel balls, wire segments, minerals and other abrasives in the centrifugal force on the surface of the steel pipe 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. After spraying, it can not only expand the physical adsorption of the surface of the pipe, but also enhance the mechanical adhesion between the coating and the surface of the pipe. Therefore, the spray (throw) shot rust is the ideal way to rust pipe repair. In general, shot peening (sand) rust is mainly used for tube surface treatment, shot blasting (sand) derusting is mainly used for pipe surface treatment. The use of spray (throw) shot rust should pay attention to several issues.
4.1 derusting grade
For the commonly used epoxy steel pipe, vinyl, phenolic and other anti-corrosion coating construction process, the general requirements of the steel surface to near white (Sa2.5). Practice has proved that the use of this rust level can almost get rid of all the oxide, rust and other dirt, the depth of the anchor to reach 40 ~ 100μm, and fully meet the coating and steel pipe adhesion requirements, and spray (throw) The rust process can be achieved with lower operating costs and stable and reliable quality to near-white (Sa2.5) technical conditions.
Hebei ChongSheng Special Steel Pipe Co.,Ltd.