Reasons for the corrosion of the grid and preventive measures

The time field of the grid is used, and if it is not properly maintained, local corrosion is easy to occur, because most of the grid engineering uses steel structure materials, due to the impact of paint and the natural environment, local rust and corrosion are prone to occur. Next, the editor of Jiangsu Huahai Steel Structure, a Xuzhou grid manufacturer, will introduce the causes of corrosion of grids and preventive measures!

1. Reasons affecting corrosion in large grid projects

The first is the aging problem of the coating of the grid. No matter what kind of material, it basically has the characteristics of aging, and this kind of anti-corrosion coating is no exception, and the aging of this kind of coating makes the anti-corrosion coating of the grid accessories fail, and then Make rust affect life. The other is a natural environmental factor around the grid project. If the air around the steel structure grid is relatively humid, it will inevitably cause the steel structure grid to gradually rust under the erosion of water and air.

In addition, if the surrounding environment is more polluted, the polluted atmosphere contains sulfides, nitrides, carbides and other corrosive harmful components, which will also affect the service life of the steel structure grid building. Therefore, it is necessary to always pay attention to the maintenance of the portal grid project. It is best to coat a layer of film, and at the same time, apply anticorrosive paint after a period of time, so that it can be used for a long time.


2. Anti-corrosion measures for large-scale grid engineering

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

2. Material selection: Special steel structure anticorrosive paint is applied to the surface of the grid material, which is still the main method for anticorrosion of the grid. According to the protection function, the anticorrosive paint of the grid can be divided into primer, middle paint and top paint, each layer of paint Each has its own characteristics, and each takes its own responsibility. Several layers are combined to form a composite coating, which improves the corrosion resistance and prolongs the service life.


3. Thickness of grid coating: Paint is an anti-corrosion intermediate material, which must be painted to form grid coating. If the coating thickness is uneven, the burrs on the surface of the grid steel or the peaks of anchor spinning will expose the coating. If the number of coating applications is small, the coating has pinholes, oxygen, chloride ions, and water molecules in the water will pass through these weak places, causing the steel to rust and corrode. The corrosion products expand in volume to form rust pockets, which gradually expand, and finally the coating blisters and falls off.