Everyone knows that food has a shelf life. After the shelf life, the quality of the food will decrease, and it will rot after a long time. The same goes for steel structures. It is widely used in high-rise civil buildings, large theaters, bridge structures and industrial plants. Due to the large number of people in these buildings, safety issues need to be paid attention to and anticorrosive work must be done. The following summarizes the relevant points of anticorrosion of steel structures. Let's take a look.

1. Hot-dip galvanized anticorrosive method

Hot-dip galvanized anticorrosive technology is currently the most widely used technology. It is also the most effective and economical method of anticorrosion of steel. It is commonly used in outdoor steel structures that are severely corroded by the atmosphere and are not easy to maintain. In actual engineering, the workpiece is mainly immersed in a molten metal zinc bath, and then electroplated to form a pure galvanized layer on the surface of the steel, and a zinc alloy coating is formed on the subsurface to play a role in anti-corrosion of steel. Generally speaking, the hot-dip galvanized layer is dense and thin, generally about 30-50μm. During construction, it should be ensured that the surface of the hot-dip galvanized parts used is smooth, no peeling, no leakage plating, no dripping, roughness and zinc thorns, and no residual solvent residues. At the same time, try not to design components with mating surfaces, so as to avoid incomplete pickling of the gaps in the mating surfaces or inaccurate pickling, which will cause the phenomenon of yellow water on the galvanized surface. .

2. Paint anticorrosive method

The construction cost of paint anticorrosive method is low, but the outdoor maintenance cost is high, and the anticorrosive effect is not good, so it is more used in relatively easy-to-maintain places such as indoor steel structures or outdoor steel structures. In actual engineering, pure zinc powder is first dissolved in solvents, additives and film-forming substances to form a zinc-rich primer, then applied to the anticorrosive workpiece, and cured on the surface of the workpiece through film-forming to prevent the corrosive medium from soaking. When using mechanical tools for paint anticorrosion, the ingredients should be adjusted according to the weather, temperature and humidity of the construction site, the viscosity should be adjusted, and the speed of the spraying machine should be flexibly controlled to avoid the spraying speed of the spraying machine is too fast or the paint surface is too slow. Accumulation and sagging affect the drying time in the later stage. At the same time, the paint should be applied 4 to 5 times during construction, and the paint should be dried to 80% or completely dry before the next spray paint.

3. Arc spraying anticorrosive method

The arc spraying method has high binding force, strong adaptability to the size of the components, almost unlimited shape and size of the components, and has long-term corrosion resistance and wear-resistant life, which can reach more than 10 months. At the same time, the anticorrosive coating does not require any other maintenance within 10 months after use, so this method is commonly used in underwater or underground structures. During construction, the surface of the steel components is first sandblasted and rust-proof to give the surface a metallic luster and roughened, and then the metal is burned and melted by an arc between two continuous wire feeds, and the arc-sprayed zinc and aluminum coating is applied to form a long-lasting anti-corrosion composite coating on the metal parts that have been sandblasted and rust-proof in advance. In addition, vertical cross-spraying should be carried out in an environment with a relative humidity of less than 85% (the spray gun is perpendicular to the workpiece). If vertical spraying is not possible, the inclination of the spray gun to the surface of the workpiece should not be less than 45°.

Different steel structures have different anticorrosive times, depending on actual requirements and operations. In order to maximize the safe use of steel structures, it is necessary to do a good job of fire prevention and anticorrosion.