24
2018
-
02
Anticorrosion treatment of steel structure
Author：
The steel structure adopts mechanical shot blasting to remove the rust layer on the surface, and the cleanliness is required to meet the Sa3 level stipulated in "Steel Surface Corrosion Grade and Derusting Grade before Coating" (GB/T8923); Evaluation of surface roughness grades of former steel (comparative sample method)" (GB/T13288). For construction sites that do not have rust removal, the surface treatment is to use wire brushes, shovels or coarse sandpaper to polish and remove rust, but the cleanliness must meet the requirements of "Rust Grade and Rust Removal Grade on Steel Surface Before Painting" (GB/T8923) . The order of surface rust removal treatment is generally first inside and then outside; first up and then down.
The anti-corrosion coating construction of steel structures is mainly carried out by airless spraying or air spraying, brushing, roller coating, etc. The working environment of anti-corrosion construction should be spacious and bright, with good ventilation, and rainproof and windproof facilities should be provided when necessary. During construction, pay attention to:
1. Pay attention to safety when working at heights, and place necessary scaffolding and scaffolding.
2. Welds with obvious unevenness should be repaired and smoothed to make them smooth.
3. For positions such as openings, free edges, and corners, it is necessary to paint multiple times to ensure that the thickness of the coating layer meets the design requirements.
4. Clean up the site after the construction is completed.
5. The construction should be suspended when the weather temperature changes suddenly, and the construction can be resumed after the weather temperature is normal.
6. The specific method of repairing paint defects:
If the unqualified position is found in the on-site construction inspection, it should be repaired in time. The repair method is to use sandpaper or grinding wheel to roughen the coating coating at the leaking point or thin coating position and the surrounding radiation area of 5cm, and then repaint. After curing, check the leak point and thickness again until qualified.
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