China Shot blasting and derusting process of steel space frame factory and manufacturers

Shot blasting and derusting process of steel space frame

The rust removal of the space structures should be carried out by shot blasting or power tools. The rust removal level of the steel space frame should reach Sa2.5 level, the surface roughness should be 40-80μm, and the area exceeding the standard should be more than 10%. Perform rust removal. After rust removal, the floating sand should be completely removed, and the first primer should be completed within 12 hours. If there is floating rust on the surface, it must be removed with sandpaper or power tools.

The paint of the steel space frame members should be sprayed. The paint before spraying must be stirred evenly, and it is not allowed to add diluent at will. If the viscosity of the paint is too large, an appropriate amount of diluent can be added, but the selection of no more than 5% of the diluent must comply with the provisions of the paint product manual. The painting work should be carried out in the shelter, the ambient temperature should be between 5°C and 35°C, the relative humidity should not be greater than 80%, and the surface temperature of the components should be 5°C higher than the dew point. After the coating is dried, the surface appearance of the paint film should be uniform, smooth, plump, free from sagging, wrinkling, bottoming, blistering, pinholes, cracks, peeling and sticky dirt. , should be repaired in time.

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Shot blasting：

Shot blasting is to use the centrifugal force of the impeller on the shot blasting machine when it rotates at high speed, and the shot blasting process is very high.
The linear velocity of the steel is shot to the surface of the steel to be treated, resulting in a blowing and grinding effect, and the oxide scale on the surface of the steel is removed.
and rust, and produce a certain roughness. Shot blasting is highly efficient and can be performed in a sealed environment.
Shot blasting and rust removal grade;
(1) Mild shot blasting and rust removal. The steel surface should be free of visible grease or dirt and free of strong oxide scale, rust and paint coatings and other attachments;
(2) Thorough shot blasting and rust removal. The steel surface should be free of visible grease or dirt and free of strong oxide scale, rust and paint coatings and other attachments;
(3) Very thorough shot blasting and rust removal. The steel surface should be free of visible grease or dirt, scale, iron attachments such as rust and paint coatings, any remaining traces should be only slight stains in the form of dots or strips;
(4) Shot blasting and rust removal to make the steel surface clean. The steel surface should be free of visible grease or dirt, oxidation skin, rust and paint coatings and other attachments, showing a uniform metallic luster;