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From the time steel is processed until it leaves the factory, its surface inevitably becomes contaminated with oils, moisture, dust and other pollutants, as well as suffering from surface defects such as burrs, scale, and rust. As we know from the main causes of corrosion in steel structures mentioned earlier, the concentration of pollutants is an important factor affecting the degree of atmospheric corrosion. Moreover, surface contaminants severely impair the adhesion of coatings to the steel surface, allowing rust to continue to spread beneath the paint layer, which results in the failure or damage of the coating and prevents it from providing the desired protective effect. Therefore, the quality of surface treatment on steel has a significant impact on the protective properties and lifespan of the coating; sometimes this impact is even greater than that caused by differences in the properties of the coating itself, and it should be given due attention. Note: For load-bearing components that are difficult to repair during their service life, the rust removal grade should be appropriately increased (up to the highest level at most). 2 Before and after rust removal, oil residues, burrs, slag, splashes, and iron oxide scale must be carefully removed. 3 The quality inspection for the rust removal and painting work shall comply with the provisions of the \"Code for Acceptance of Construction Quality of Steel Structure Projects\" GB50205.