What anti-corrosion measures do steel structures have?

Steel structure is one of the commonly used building structures. In addition to industrial plants, it is also widely used in multi-storey civil building structures. Large theater. Bridge structure and office building structure. In practical engineering, due to the lack of steel maintenance, corrosion often occurs, affecting the quality of engineering structure, resulting in building collapse and other accidents. What are the anti-corrosion measures of steel structure?

1. Coating method: Corrosion resistance of coating method is generally not as good as long-term anticorrosion method. As a result, many indoor and outdoor steel structures are easy to maintain. Coating costs are low, but outdoor maintenance costs are high.

2. Hot dipping zinc: Hot dipping zinc is to immerse the steel parts after rust removal into 600 ℃ in about 50% of the high-temperature zinc solution, a layer of zinc attached to the steel surface mm zinc layer thickness shall not be less than 65μm, thick plate is not less than 86μm.

For the purpose of preservative. Its advantages are long durability, high degree of industrial production and relatively stable quality. Therefore, when used in outdoor steel structures, atmospheric corrosion is more serious and not easy to repair.

3. Hot spray aluminum (zinc) composite coating: It is a long-term anticorrosion method with anti-corrosion effect equivalent to hot dipping zinc. Its advantage is that it has strong adaptability to the size of the component, and there is almost no limit to the shape and size of the component. Large locks are also built in this way.

At the same time, the thermal effect of the process is local. It is restricted so that no thermal deformation occurs. Compared with hot dipping zinc, the process is less industrialized, aluminum spraying (zinc) labor intensity is higher, and the emotional changes of the operator are also very sensitive.

4. Weathering steel: Weathering steel has better corrosion resistance than ordinary steel structures. It contains phosphorus, copper, nickel. Chromium, titanium and other metals can form an effective protective layer on the metal surface and improve corrosion resistance. At the same time, its low temperature impact toughness is better than ordinary steel structural steel.

5. Cathode protection law: Add active metal to the surface of steel structure instead of steel corrosion. It is often used in underwater or underground structures