Steel structure engineering buildings can be seen in many places. However, the surface of the steel structure should be anti-corrosion and surface treatment to ensure the quality of the surface of the steel structure. The following steel structure plant will take a look at the corrosion prevention method and surface treatment of steel structure.
1, metal protective layer: metal protective layer is a metal or alloy with cathode or anode protection, through electroplating, spray plating, chemical plating, hot plating and osmotic plating and other methods, in the need to protect the metal surface to form a metal protective layer (film) to isolate the contact between the metal and the corrosive medium, or the use of electrochemical protection to protect the metal, so as to prevent corrosion.
2, chemical protective layer: through chemical or electrochemical methods to generate a compound film with corrosion resistance on the surface of the steel to isolate the contact between the corrosive medium and the metal to prevent the corrosion of the metal.
3, non-metallic protective layer: with paint, plastic, enamel and other materials, through brushing and spraying methods, the formation of a protective film on the metal surface, so that the metal and the corrosive medium isolation, so as to prevent the corrosion of the metal.
Steel surface treatment:
After steel processing, before leaving the factory, the surface of the component will inevitably be stained with pollutants such as oil, water, dust, and surface defects such as burrs, oxide sheets, and rust layers.
From the main reasons for the corrosion of the steel structure, we know that the content of pollutants is an important factor affecting the degree of atmospheric corrosion, and the surface dirt will seriously affect the adhesion of the paint on the surface of the steel, and make the rust under the paint film continue to expand, leading to the failure or destruction of the coating, and can not achieve the desired protective effect.
Therefore, the impact of the quality of steel surface treatment on the protective effect and life of the coating is sometimes even greater than the difference in the performance of the coating itself, and should be paid attention to.
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