The thickness of the hot-dip galvanized coating of the steel grating determines the corrosion resistance of the steel grating. The user can choose the thickness of the zinc coating higher or lower than the standard. For the thin steel grating below 3mm with smooth surface, it is difficult to obtain a thicker coating in industrial production. In addition, the zinc coating is not commensurate with the thickness of the steel grating plate. Thickness affects the adhesion of the coating to the substrate and the appearance of the coating.
Too thick coating will cause the coating to have a rough appearance and be easy to peel off, and the steel grating plated parts cannot withstand the collision during handling and installation. If there are more active elements silicon and phosphorus in the raw materials of steel grating, it is also very difficult to obtain a thinner coating in industrial production. This is because the content of silicon in the steel affects the growth mode of the alloy layer between zinc and iron, which will cause the zinc-iron alloy to grow. The layer grows rapidly and causes the surface of the coating to be rough and dull, resulting in a dark coating with poor adhesion.
Therefore, as discussed above, there is uncertainty in the growth of the galvanized layer of steel grating, and it is often difficult to obtain a certain range of coating thickness in actual production. The thickness specified in the hot-dip galvanizing standard for steel grating is a large number of experiments The experience value generated later, taking into account various factors and requirements, is more reasonable.
If the silicon content of the steel grating is high, zinc-nickel alloy can be added to reduce the amount of zinc. Flux additives can also be added to enhance the appearance of the zinc coating. In the hot-dip galvanizing process of steel grating, if the surface of the steel grating is to be bright and the coating layer is thin, it has a lot to do with each process. , The lifting speed of the vehicle has a lot to do with it.
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