The exterior color of the galvanized steel grating is usually silvery. Because zinc is silvery, of course some will be painted and turned blue. The purpose of galvanizing is to smooth the surface of the steel grating and prevent rust. Some steel gratings are rusted after galvanizing. This depends on the selected raw materials. If it is iron, it may be the principle of absorbing anode and protecting cathode in anti-corrosion.
Some steel gratings need to be passivated after galvanizing in order to improve the corrosion resistance after galvanizing. The color of the steel grating that has just been galvanized is yellow or light yellow, and then after a film removal process (acid-base neutralization), it will become silver (the color of zinc), and the passivation process is performed after the film removal.
After the passivation process, it is possible to produce different colors such as blue and white, multicolored, black and even yellow (detailed colors are made according to customer requirements). The authenticity of the galvanized steel grating is mainly determined by the thickness of the galvanized steel. The general hot-dip galvanized steel grating requires a film thickness of more than 70 чm, while the general cold-galvanized steel grating is good if it can reach 10 чm. Up.
The quality of galvanizing directly affects the price of steel grating. Basically, the thicker the galvanized layer, the higher the price.
Post time: Dec-27-2021