Reasons and prevention of corrosion in space frame engineering

 As most of the space frame project adopts steel structure material, due to the influence of coating and natural environment, it is very easy to appear rust and corrosion. The following explains how to do a good job in the construction of large-scale network frame project anti-corrosion measures.

 First, the influence of large-scale network frame project corrosion causes

First of all is the space frame project coating aging problem, no matter what kind of material are basically aging characteristics, and this anti-corrosion coatings are no exception, but also the aging of this coating makes the steel structure anticorrosion coating failure, which makes the rust affects the life.

In addition, there is a natural environment factor around the space frame project, if the air around the steel structure plant is humid, then it will make the steel structure rust gradually under the erosion of water and air.

In addition, if the surrounding environment is more polluted, in which the polluted atmosphere has sulfide, nitride, carbide and other corrosive and harmful components content, etc., then it will also affect the service life of the steel structure plant.

Therefore, for the maintenance of portal steel frame project, need to always pay attention to, it is best to plating a layer of film, at the same time after a period of time to anticorrosive paint coating, make it can be used for a long time.



 Second, the anti-corrosion measures of large-scale space frame project

1, surface treatment: the surface treatment of steel structure is very important, the same kind of paint, the same kind of corrosive environment, the use of different construction techniques life can be extended three times to five times. The dirt and rust layer on the surface of steel should be removed, especially the black oxide skin formed when rolling steel, which is the cathode of electrochemical corrosion and the root cause of corrosion, and must be removed. The quality of surface treatment should reach Sa2.5 level of steel surface pretreatment specification before painting.

2, material selection: surface painting special steel structure anticorrosion paint is still the main means of steel structure anticorrosion and space frame anticorrosion at present. Anti-corrosion paint for steel structure can be divided into primer, middle paint and top coat according to the protection function, each layer of paint has its own characteristics, each has its own responsibility, and several layers are combined to form a composite coating, which improves the anticorrosion performance and prolongs the service life.

3, coating thickness: paint is an intermediate material for anti-corrosion, must be painted to form a coating. If the coating thickness is uneven, the steel surface burrs or anchor spinning peak will reveal the coating. If the coating construction traverses less, the coating has pinholes, the oxygen in the water, chloride ions, water molecules, etc. will pass through these weak places, so that the steel rust corrosion. Corrosion products volume expansion, the formation of rust package, gradually expand, and finally the coating blistering off.

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