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What are the methods for derusting the surface of spiral steel pipes?

The following are four methods and characteristics of spiral steel pipe(eg:SSAW steel pipe) surface derusting treatment

1. Cleaning

Use solvents and emulsions to clean the surface of steel to remove oil, grease, dust, smoothing agent and similar organic matter, but it cannot remove rust, oxide scale, welding flux, etc. on the surface of steel, so it is only used as an auxiliary treatment in anti-corrosion production .

2. Spray rust removal

Jet rust removal is a high-speed rotation of the jet blade driven by a high-power motor, so that steel grit, steel shot, iron wire, minerals and other abrasives are sprayed on the surface of the steel pipe under the effect of centrifugal force, which can not only completely remove rust, oxides and dirt. And the steel pipe can reach the required average roughness under the effect of the fierce abrasive impact and friction.

After spraying to remove rust, not only can the physical adsorption effect of the pipe surface be expanded, but also the mechanical adhesion effect of the anti-corrosion layer and the pipe surface can be enhanced. Therefore, spray rust removal is an ideal rust removal method for pipeline anticorrosion. Generally speaking, shot blasting is mainly used for internal and external surface treatment of pipes, and shot blasting is mainly used for pipe surface treatment.



3. Derusting tools

First, use wire brushes and other tools to polish the surface of the steel, which can remove loose or warped oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the steel surface is attached with strong oxide scale, the tool rust removal results are not ideal, and the anchor pattern depth required for anti-corrosion construction cannot be reached.

4. Pickling

Generally, two methods of chemical and electrolysis are used for pickling treatment. Pipeline anticorrosion only uses chemical pickling, which can remove oxide scale, rust, and old coatings. Sometimes it can be used as sandblasting and rust removal. Although chemical cleaning can make the appearance reach a certain degree of cleanliness and roughness, but its anchor lines are shallow and easily pollute the situation.
 

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