Introduction of common anticorrosion technology for steel structure

1. Hot dip galvanized anticorrosion method

Hot dip galvanized anticorrosion technology is now a better, widely used technology, but also the use of good role and economic benefits of steel anticorrosion method, often used for atmospheric corrosion is more severe and not easy to repair outdoor steel structure. In practical engineering, it is mainly to dip the workpiece to be plated into the molten metal zinc tank first, and then coating it, so that the steel surface constitutes a pure galvanized layer, and the secondary surface constitutes a zinc alloying coating, and then play the role of steel anticorrosion. Generally speaking, the hot dip zinc coating is dense and thin. During construction, it should be ensured that the hot dip galvanized parts used are smooth, no peeling, no leakage, no droppings, rough and zinc thorns, and no residual solvent residue. Together, we should also try not to plan components with matching surface, to avoid incomplete pickling or acid cleaning in the gap of matching surface, so that the phenomenon of yellow water flow on the galvanized surface.

2. Paint anticorrosion method

The construction cost of paint anticorrosion method is lower, but the cost of outdoor protection is higher, and the anticorrosion effect is not good, so it is more used for indoor steel structures or outdoor steel structures that are relatively easy to protect. In practical engineering, the first pure zinc powder dissolved in solvents, additives and film forming materials and constitute a zinc rich primer, and then it is coated to the anti-corrosion workpiece, after forming a film to solidify on the surface of the workpiece, and then block the corrosion medium immersion. When using mechanical things to paint anticorrosion, should be based on the construction site climate, temperature, humidity around the medium to explore ingredients, modulation viscosity, sensitively grasp the speed of spraying machine travel, avoid spraying machine travel speed too fast constitute blank, or too slow constitute paint accumulation, flow hanging, and affect the late dry moment. Together, the construction should be daubed 4~5 times of paint, and should be in paint dry to 80% or completely dry after the next paint spraying.

3. Arc spraying anti-corrosion method

Arc spraying method has high binding force, strong adaptability to component scale, component shape scale is almost unlimited, and has a long corrosion resistance and wear resistance life of more than 10 months, together with the use of 10 months in the anti-corrosion coating without any other protection, so this method is often used in underwater or underground structures. Construction, should first blast on steel members appearance, make its appearance with metallic luster, and make hair, then after burn in between two consecutive sent to wire arc to molten metal, and spray it in advance slinging derusting consists of electric arc spraying zinc and aluminum coating on metal components, and then make long-term anti-corrosion composite coating. In addition, the relative humidity should be less than 85% of the environment for straight interpenetration spraying, if the straight spraying can not be carried out, the spray gun and the workpiece surface slope should not be less than 45°.