In the design of steel structure engineering, a large amount of steel is used, which requires various anti-corrosion coatings for coating protection. However, if the steel used in a building rusts extensively, its service life will be greatly shortened. The quality of steel structure rust removal directly affects the quality of paint, so the rust removal step is more critical. Let’s learn about the precautions for steel structure rust removal !
1. Pickling and rust removal is to immerse the steel components to be painted in an acid pool, and use acid to remove oil and rust on the surface of the components. The pickling process is also more efficient and can remove rust more thoroughly. But after pickling, clean the components with hot water or clean water. If there is residual acid, the corrosion of the components will be more severe.
2. Manual rust removal uses some relatively simple tools, such as scrapers, grinding wheels , emery cloth , wire brushes , etc., to remove rust on steel components manually. This method has low work efficiency, poor working conditions, and incomplete rust removal.
3. Sand blasting and rust removal uses the pressure of compressed air to continuously impact the surface of steel components with quartz sand or iron sand to clean rust, oil and other debris on the surface of the steel to reveal the original metal steel. rust method. This method is highly efficient and thorough in rust removal, making it a better rust removal process.
How to deal with steel structure rust removal:
1. Use a clean rag or brush dipped in solvent to wipe off the grease on the surface, and "solvent clean" it to the steel structure coating surface treatment standard Sa2.5 or St3 level. Firmly adhered sediments should be shoveled off and cleaned with solvent;
2. Chloride, sulfate and other rust salts on the surface of steel plate should be rinsed with clean water, and then wiped with a dry rag or dried with hot air to remove moisture and water 3. Remove all scale, rust, scale , marking paint and other attachments;
4. Before applying primer, use a vacuum cleaner , hair dryer, etc. to remove all dust and residues on the surface.
For surface treatment of old paint and application of paint:
If there is old paint or original paint on the surface of the steel structure, sandblasting should be used to remove rust from the steel structure as much as possible. Sandblasting steel structure rust removal method can completely remove rust surface and old paint. At the same time, debris attached to the metal surface can be removed, and the surface after sandblasting can provide good mechanical adhesion for the paint film. However, for areas where sandblasting cannot be performed, manual mechanical rust removal can be used. The tools are usually emery cloth, scraper, hammer chisel, wire brush, angle grinder, grinder , etc. The rust removal grade is Sa2.5 or St3. Old coatings should be cleaned as much as possible. For old coatings that cannot be removed, apply a small area before applying the new coating. If you have primer, you should use a paint stripper to remove the old coating.
Precautions for steel structure rust removal:
During the painting process, the quality of the surface treatment of the base material has a great influence on the life of the coating film. About half of coating failures are due to improper surface preparation. Because the required adhesion is not achieved, the coating cracks and falls off.
The above introduction is about the precautions for rust removal of steel structures. If you need to know more related knowledge, you can contact us at any time!
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