Why does the boiler spraying need to be sealed and its function?

       

Boiler spraying is a method of using a heat source to heat the sprayed material to a molten or semi-molten state, and spraying and depositing it at a certain speed on the surface of the pretreated substrate to form a coating, thereby imparting special functions to the surface of the substrate. Take the spraying process of ordinary supersonic flame (HVOF) spraying method and atmospheric plasma spraying method as an example. The coating is a layered structure in which countless deformed particles are stacked in waves, so there are inevitably some pores between the deformed particles in the coating. The pores can be classified into surface pores (open pores), closed pores and through pores (through pores) according to their existing forms. When the coating is used for corrosion resistance, if there are openings or closed pores in the coating, the corrosive medium cannot directly reach the surface of the substrate, so the substrate cannot be directly corroded. However, if there are through holes in the coating, the corrosive medium will directly reach the surface of the protected substrate through the holes, resulting in chemical or electrochemical corrosion between the coating and the substrate, and corrosion products will accumulate at the interface, causing the coating to crack and fall off. The result of failure of the coating. Therefore, in order to prevent the corrosive medium from eroding the substrate, improve the corrosion resistance of the coating, and expand its application range in special environments, it is necessary to seal the holes of the coating. The purpose of boiler spraying is mainly because the boiler is under high pressure and high temperature, and at the same time it is corrosive to the salt battery and oxygen in the water environment. The protective effect of spraying is to add a protective film on the boiler to separate the metal from the medium in the air, so as to protect the boiler and prolong its service life.

wococarbide.com is committed to spraying technology, prolonging the service life of boilers, reducing costs, and spraying is widely used in many industries. Reasonable and effective protection technologies for large areas have been widely used. In recent years, coatings of lead, zinc, and other alloys have been widely developed to replace traditional painting methods for long-term atmospheric corrosion protection of steel structures that are often exposed to the outdoors. Such as large-scale projects such as TV towers, bridges, highways, microwave towers, high-voltage transmission towers, underground cable support frames, pontoon drums, wells and other large-scale projects, all are sprayed with lead, zinc and their alloys for corrosion resistance. At present, there are dozens of professional spraying factories in China engaged in this work. This technology is widely used not only domestically, but also in foreign aid projects. Water-cooled wall anti-wear spraying adopts supersonic spraying technology to repair and strengthen localization of large-scale important equipment and imported parts. In recent years, there have been many successful applications in this field. Therefore, it is necessary to spray the boiler.