Causes and preventive measures of corrosion in space frame engineering

Since steel structure and space frame engineering mostly use steel structure materials, affected by paint and natural environment, rust corrosion and other problems are very likely to occur, and a series of measures should be taken to solve the problem of rust corrosion. First, the causes of corrosion affecting large-scale space frame projects

The first is the coating aging problem of the space frame engineering, no matter what kind of material has the characteristics of aging, and this anti-corrosion coating is no exception, but also the aging of this coating makes the failure of the steel structure anti-corrosion coating, and then makes the steel structure material rust affect the life.

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

In addition, if the surrounding environment is polluted, among which there are sulfide, nitride, carbide and other corrosive and harmful components in the polluted atmosphere, it will also affect the service life of the steel structure plant.
Therefore, for the maintenance of steel frame engineering, it is necessary to always pay attention to the plating of a layer of film at the same time, after a period of time to be painted anti-corrosion paint, so that it can be used for a long time.

Second, anti-corrosion measures for large-scale space frame projects

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

2, material selection: surface coating of special steel structure anti-corrosion paint, is still the main means of steel structure anti-corrosion and space frame anti-corrosion. Steel structure anticorrosive coating according to the protection function can be divided into primer, middle paint and top paint, each layer of paint has its own characteristics, combined to form a composite coating, improve anti-corrosion performance, extend the service life of steel structure and space frame.

3, coating thickness: coating is an anti-corrosion intermediate material, after coating to form a coating. If the coating thickness is uneven, burrs on the surface of the steel or the top of the anchor spinning will reveal the coating. If the coating construction passes are few, the coating has pinholes, and oxygen, chloride ions, and water molecules in the water pass through these weak places, making the steel rust and corrosion. The corrosion products expand in volume, forming rust packets, gradually expanding, and eventually causing the roof coating to bubble off.