How many steel structure anticorrosive coating thickness is applied in the field of steel structure anticorrosive coating
Source: Author: release time: 2016-09-11 clicks: 57
I wonder if you have noticed that paint has its thickness, for example, steel structure anticorrosive paint. The thickness of steel structure anticorrosive coating is still relatively small from the microscopic point of view, because it plays a role of anticorrosion, so it will be thicker. The application field of steel structure anticorrosive coating is also extensive, and many industries will also be used in large quantities. What is the thickness of steel structure anticorrosive coating? What are the application fields of steel structure anticorrosive coatings?
What is the thickness of steel structure anticorrosive coating?
Anticorrosive coating is a new type of anticorrosive coating for steel structure, which is successfully developed on the basis of oil resistant and anticorrosive coatings. The coating is divided into two kinds: primer and topcoat. According to the code for acceptance of construction quality of steel structures, the design drawings shall be 150 m outdoor and 125 mu m indoors, and the allowable deviation is -25 m. The allowable deviation of the thickness of the dry paint film for each coating is -5 m.
According to the thickness of fireproof coating, it can be divided into three types: super thin steel structure fire retardant coating, thin steel structure fire retardant coating and thick coated steel structure fire retardant coating. The coating thickness of not exceeding 3mm is ultra-thin fire retardant coating, which can be constructed by spraying, brushing or roller coating. It is generally used in the construction steel structure which requires less than 2h of fire resistance.
The coating thickness of 3 ~ 7mm is thin coated fire retardant coating, its decoration is better than thick coating type, the construction uses spraying, and is generally used in the construction steel structure whose fire resistance limit is not more than 2H.
The coating thickness of 8 ~ 50mm is thick coated fire retardant coating, its fire resistance limit can reach 0. 5 ~ 3H. Generally, spraying is applied to indoor steel structures with fire resistance above 2H.
What are the application fields of anticorrosive coatings for steel structures?
First, improve the essence of metals: alloy treatment:
Many overseas scholars have studied the influence of various alloying elements on corrosion resistance of steel products. It is found that alloy steels based on Cr, Ni, Cu, P, Si and rare earth have excellent anticorrosive properties. On this basis, a series of steels for seawater corrosion resistance have been developed. However, based on economic and technological considerations, the above elements are not widely used in seawater corrosion resistant steels.
Second. Form a protective coating: coating non-metallic or metal protective layer:
The metal protection layer is mainly for phosphating, oxidizing and passivation treatment of the coated metals; the non-metallic protective coating is mainly used to coat the paint, plastic, enamel and mineral grease on the metal surface to form a protective layer. The purpose of these two protective layers is to isolate the substrate from seawater and replace the substrate to react with seawater to form protection.