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Long-term Anticorrosion Of Steel Frame Sep 27, 2017

      In the past, steel structure and the anti-corrosion of the grid has not been due attention, only the use of manual derusting, brushing general red primer and ordinary paint, the use of six months or a year later, coating blister, rust, fall off, steel corrosion, repair is very difficult. The damage of the anticorrosive layer is caused by many factors, the main reason is that the coating material is not corrosion resistant and the coating construction method is improper.Steel Frame

      Long-term exposure of steel structures and grids in the air, when the climate changes, the relative humidity of the air exceeds a certain threshold, the surface of the steel will form a water film, the air humidity of the critical value of the surface of steel and the surface of the presence of moisture-free material.Steel Frame

      The corrosion of steel is mainly electrochemical corrosion, steel structure in welding caused by the difference between the material, welding slag and stress will form a corrosive battery cathode and anode zone, especially steel surface rust is not complete, steel surface with a layer of iron oxide skin. Steel Frame

      Some people think that the oxide skin is not rust, in fact, this oxide is a high-temperature corrosion products, mainly the ferric oxide, it in the water containing trace salt, and steel electrode potential difference of up to 0.26 volts. In the water film, the rolling oxide peel will be used as the cathode in the pure steel to form the anode. The anode is continuously corroded, the cathode gradually expands, the rust product arches the coating, the steel structure is corroded.Steel Frame

     Surface treatment is very important, the same kind of paint, the same corrosive environment, the use of spray derusting than the manual derusting paint film Life can be extended three times times to five times times. The dirt and rust layer of the steel surface should be removed, especially the black oxidized skin formed when rolling the steel, which is the cathode of electrochemical corrosion and the root of corrosion and must be removed. The surface treatment quality should reach the Sa2 of steel surface pretreatment standard before coating. Level 5.Steel Frame