What are the surface treatment processes of stainless steel square pipes

As a common building material, the surface treatment process of stainless steel square pipe is very important to improve the corrosion resistance and aesthetics of stainless steel square pipe. The following will introduce the surface treatment process of several common stainless steel square pipes.

1. Mechanical polishing
Mechanical polishing is a common surface treatment method for stainless steel square pipes. By grinding the pipe with grinding machine, grinding wheel, roller or vibration polishing equipment, the surface of the square pipe is removed by burrs and unevenness, so that the surface of the square pipe can reach a high finish. Mechanical polishing can not only enhance the corrosion resistance of stainless steel square pipes, but also make them have better gloss.

2. Chemical polishing
The common method of chemical polishing is to pickling the other tube, by soaking the stainless steel square tube in an acidic solution to remove the oxide and rust layer on the surface, so that the surface is more smooth. Pickling can improve the oxidation resistance and corrosion resistance of stainless steel square pipe, but it is necessary to pay attention to the proportion of pickling liquid and treatment time to avoid corrosion of stainless steel square pipe.

3. Electropolishing
Electrolytic polishing is electroplating. By soaking the stainless steel square tube in the electrolyte containing metal ions, metal ions are deposited on the surface of the stainless steel square tube to form a metal coating through the action of current. Plating can make the stainless steel square tube form a smooth surface, while enhancing corrosion resistance, suitable for high decorative and sanitary applications.

4. Sand blasting
Sandblasting is the use of high pressure sandblasting machine to evenly spray sand particles to the surface of the pipe, remove oxides and impurities, and form an appropriate surface roughness, which is conducive to the adhesion of subsequent coatings. Common sandblasting materials are quartz sand, glass beads and so on.

5. Passivation treatment
Stainless steel is treated with a solution containing nitric acid, phosphoric acid or other passivating agents to promote the formation of a dense passivating film on the surface, thereby further improving its corrosion resistance.

6. Coating treatment
According to the needs, the stainless steel square pipe can be painted (such as spray painting, electrophoretic painting, etc.), which can not only play a protective role, but also achieve the decorative effect.

In summary

The surface treatment process of stainless steel square pipe has mechanical polishing, chemical polishing, electrolytic polishing, sandblasting and passivation methods. Different surface treatment processes can improve the corrosion resistance and aesthetics of stainless steel square pipes. When selecting the surface treatment process, it is necessary to determine the appropriate process method according to the specific requirements and the use environment.