The role and technical application of boiler spraying

       

Boiler thermal spraying technology is a comparative technology in the field of surface engineering, accounting for about 1/3 of surface engineering technology. Boiler spraying technology uses different heat sources and spraying equipment to heat a wire or powder material to a molten or semi-molten state, accelerate the formation of high-speed molten droplets, and spray them on the surface of the substrate to form a film with the required properties. So as to achieve the purpose of modifying the surface of the substrate surface treatment technology. This paint is called spray. Because the thermal spray coating has a special layered structure and a large number of tiny pores, the bonding between the coating and the substrate is generally mechanical, and its bonding strength is low.

Boiler thermal spraying technology is a comparative technology in the field of surface engineering, accounting for about 1/3 of surface engineering technology. Boiler spraying technology uses different heat sources and spraying equipment to heat a wire or powder material to a molten or semi-molten state, accelerate the formation of high-speed molten droplets, and spray them on the surface of the substrate to form a film with the required properties. So as to achieve the purpose of modifying the surface of the substrate surface treatment technology. This paint is called spray. Because the thermal spray coating has a special layered structure and a large number of tiny pores, the bonding between the coating and the substrate is generally mechanical, and its bonding strength is low.

1. Rust, paint coating, etc. The surface exhibits a uniform metallic luster, which is favorable for the adhesion and adsorption (molecular dissolution and diffusion) between the molten powder and the substrate surface. The cleanliness of the working surface reaches the Sa3.0 level stipulated in GB8923-88 "Corrosion Grade and Derusting Grade of Steel Surface Before Coating". 2. Rough surface: The combination of the thermal spray coating and the substrate is mainly a mechanical combination. The pretreatment of the substrate is required not only to remove oil and rust, but also to make the surface rough, and the used surface has a certain roughness. The surface roughness reaches RZ50-90μm stipulated in GB11373-89 "General Rules for Thermal Spray Metal Pretreatment". In the process of using the boiler, why should the boiler be sprayed? The reason for boiler spraying is that the operation of the boiler is carried out under high temperature and high pressure, and there are corrosion of salt batteries and corrosion of oxygen in water. Therefore, in order to avoid the corrosion of the boiler, it is necessary to spray paint to ensure the long service life of the boiler. However, boilers that do not normally require cooling require preheating. So unless it is a power plant boiler, cooling towers are not used, but cooling towers are not used to cool boilers. Spraying refers to adding a layer of original film on the boiler to separate the metal from the medium, protect the boiler and prolong its service life. In actual operation, boiler spraying has achieved more effects than the enterprise imagined, not only improving the service life of the boiler, delaying the replacement time, but also greatly reducing the maintenance cost of the boiler, which is undoubtedly good news for the enterprise. This is why boiler spraying is required. For more information, please pay attention to our company's official website