When using the spraying machine, the spraying of iron frame and steel structure is essential. Do you know the technical knowledge about this? Experts tell you that you must first polish the surface of steel structure for rust removal, and also remember that the steel structure after polishing should be able to finish the first painting in 4 hours.
1: Much attention should be paid to the fact that we must first remove rust from the surface of steel structures, except for rust, oxide scale and other impurities. Of course, more attention should also be paid to the quality control of surface treatment, which should meet the Sa2.5 level stipulated in GB8923 standard of "surface corrosion grade and rust removal grade of steel before painting", and the surface roughness should be 35-75um. After polishing, the sand and dust will be removed.
2: Basically, it's better to finish the first paint in 4 hours after polishing the steel structure. In many cases, we also need to focus on the use of ET-98 inorganic phosphate long-term zinc-rich paint as primer, in most cases, it is degreasing, rust removal, not grinder, but with wire brush, polisher or steel sandpaper treatment.
3: If you encounter welding parts, it is recommended that you do not paint the candle within 72 hours after welding.
4: Usually, it is better for us to use light-sweep polishing method to remove the ash layer and its oil contamination and other impurities. Of course, in the later use process, we also need to pay attention to its 70-H epoxy iron red anticorrosive paint.