Three key points that steel structure anti-corrosion needs to pay attention to

Category： Industry News

Time：2020-07-08

During the use of the steel structure, chemical, electrochemical or physical interaction is easy to occur between it and the environmental medium it is located in, causing the deterioration of the material and the failure of the steel structure, which forms the corrosion of the steel structure. Today, Xiaobian will introduce to you the three key points that we need to pay attention to in the anti-corrosion of steel structures during the construction process:

First, surface treatment

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

Second, material selection: surface painting special steel structure anti-corrosion paint is still the main means of anti-corrosion and grid anti-corrosion of Chengdu steel structure. Anti-corrosion paint according to the protection function can be divided into primer, middle paint and topcoat, each layer of paint has its own characteristics, each responsible for its own responsibility, several layers combined together, to form a composite coating, improve anti-corrosion performance, prolong the service life.

Third, coating

thickness: coating is an intermediate material for anti-corrosion, and must be coated to form a coating. If the coating thickness is uneven, burrs on the steel surface or high peaks of the anchor spinning expose the coating. If the coating is applied in a small number of passes and the coating has pinholes, oxygen, chloride ions, water molecules, etc. in the water will pass through these weak places, making the steel rust and corrode. The volume of corrosion products expands, forming rust packs, gradually expanding, and finally the coating blisters off.

There is a steel structure anti-corrosion problem first introduced here, there are friends who need to do steel structure engineering. Please contact us! Steel structure, we are more professional!

Keywords： Three key points that steel structure anti-corrosion needs to pay attention to

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