Specific operation method for surface treatment of skived and roller burnished tube

- Jul 22, 2019-

What are the specific operation methods for the surface treatment of the skived and roller burnished tube?

 

1, pickling

 

Generally, chemical cleaning and electrolysis are used for pickling treatment. Pipeline anti-corrosion is only 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.

 

2, cleaning

 

Use solvent and emulsion to clean the surface of the rolling tube to remove oil, grease, dust, lubricant and similar organic matter, but it can not remove rust, scale, flux, etc. on the surface of the rolling tube, so only in anti-corrosion production As an aid.

 

3, tool rust removal

 

The surface of the rolling tube is mainly polished by using a wire brush or the like to remove loosened or lifted scale, rust, welding slag, and the like. The descaling of manual tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the surface of the rolling tube is attached with strong iron oxide scale, the rust removal effect of the tool is not ideal, and the anchor depth required for anti-corrosion construction cannot be achieved.

 

4, spray (throw) shot derusting

 

Spraying (polishing) rust removal is carried out by a high-power motor to drive the spray (bounce) to rotate at high speed, so that the abrasives such as steel grit, steel shot, wire segment and mineral are sprayed on the surface of the rolling tube under centrifugal force. The shot treatment not only completely removes rust, oxides and dirt, but also the rolling tube can achieve the required uniform roughness under the action of abrasive impact and friction.

 

After spraying (polishing) and removing rust, not only can the physical adsorption of the surface of the tube be enlarged, but also the mechanical adhesion of the coating layer to the surface of the tube can be enhanced. Therefore, spray (throwing) radiation derusting is the ideal way to remove corrosion from pipelines. In general, shot blasting (sand) derusting is mainly used for the inner surface treatment of pipes, and shot blasting (sand) descaling is mainly used for the outer surface treatment of pipes.

 

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