There are several common methods for the surface treatment of forged flanges: pickling: Soaking the flanges with an acidic solution (such as hydrochloric acid, sulfuric acid, etc.) to remove the oxides, rust, welding slag and other impurities on the surface, so that the surface is clean and has a certain roughness, and improve the adhesion and corrosion resistance of the coating. Shot blasting cleaning: through high-speed spraying of cast steel sand, iron ore and other particles, impact the surface of the flange, remove oxide, rust, dirt, etc., while increasing the surface roughness, to provide better coating adhesion and surface quality. Chemical coating: The use of chemical methods to form a layer of protective coating on the surface of the flange, such as phosphating film, chemical galvanizing, electroplating, etc., can improve the corrosion resistance and beauty of the flange. Hot dip galvanizing: the flange is immersed in the melted zinc, after a series of cleaning, pretreatment, drying and other processes, so that the zinc on the surface of the flange to produce a layer of zinc-iron alloy coating, providing excellent corrosion resistance. Spraying coating: Spraying equipment is used to evenly spray the coating on the surface of the flange to form a protective coating. Different types of coatings can be selected according to needs, such as epoxy resin, polyurethane, etc., to improve the corrosion resistance and corrosion resistance of the flange. Fine sand wheel grinding: Use fine sand wheel to grind the surface of the flange, remove surface defects, poor finish parts, so that it has a smoother surface and better appearance quality. The choice of appropriate surface treatment should be based on flange material, working environment requirements and expected service life and other factors. At the same time, after surface treatment, it is also necessary to pay attention to protect the surface of the flange from damage to ensure the durability and stability of its performance and appearance.
