What are the processing techniques for galvanized steel grating

The current steel grating series products generally use hot-dip galvanizing surface treatment. The galvanized layer has excellent anti-corrosion performance. On the one hand, the coating acts as a barrier layer to isolate the substrate from the surrounding corrosive environment; on the other hand, the galvanized layer can act as a dedicated anode to produce an electrochemical protection effect on the body, so that the steel plate itself is protected from corrosion and its service life is extended.

If the galvanized layer of the steel grating substrate is not firmly bonded, the zinc layer falls off, and the exposed steel grating loses the protection of the coating. Therefore, the adhesion of the galvanized layer is a key issue affecting the quality of galvanized steel grating products, and it is also the direct cause of cracks and falling of the zinc layer. The following is an analysis of the factors affecting the adhesion of the zinc layer of the steel grating.

According to the principle of meshing, increasing the surface roughness of the circular plate can improve the adhesion of the zinc layer, but in fact, due to the roughness of the surface of the steel grating substrate, it also creates favorable conditions for the residue of rolling oil, grease and iron powder, which is not conducive to improving the adhesion of the zinc layer, and even has a tendency to deteriorate.

The residues on the surface of the flat steel used for galvanizing steel grating plates are mainly grease (rolling oil, lubricating oil, hydraulic oil, etc.) and fine solid particles (iron powder, dust, etc.).

But it has almost no cleaning effect on the residual solid particles. When the surface cleanliness of the raw material is lower than the cleaning capacity of the annealing furnace, there will be residual residues on the surface of the flat steel. When the total amount of this part of the residue exceeds the allowable value of galvanizing, there will be problems such as smaller zinc flowers, poor uniformity of zinc flowers, cracks in the coating, and even zinc layer falling off.