Technical purpose and matters needing attention of boiler thermal spraying

       1. The purpose of spraying the boiler is because the boiler operates under high temperature and high pressure, and there is corrosion of salt batteries and oxygen corrosion in the water body. The function of spraying is to add a protective film on the boiler to separate the metal from the medium, thereby protecting the boiler to a certain extent and prolonging its service life.



2. When the spraying performance standard is not high, there are no special requirements for the environment, and the melting point of the spraying material is less than 2500 ℃, the spraying process with simple equipment can be used.

3. The spraying performance standard is higher. For precious or critical components with harsh working conditions, the plasma spraying process is used. Compared with oxyacetylene flame spraying, plasma spraying has high flame temperature, sufficient melting, non-oxidizing properties, high coating bonding strength and low porosity.

4. When the coating standard has high bonding strength and low porosity, high-speed flame spraying can be used for metal materials or cermet coatings; high-speed plasma spraying can be used for oxide ceramic coatings.



5. According to the material, technical requirements and working conditions of the workpiece, the materials for the base layer and the working layer are used. Refer to other relevant information when selecting materials. In general, fine powder is used for thin coatings and coarse powder is used for thick coatings.



6. The main purpose of spraying parts is mostly to compensate for the worn size.

7. Confirm the spraying parameters based on the properties, thickness and particle size of the coating material, including the pressure of acetylene and oxygen, the spray distance, the relative movement speed of the spray gun and the workpiece, etc. The above is the explanation made by Shandong Dingsheng Spraying Engineering Co., Ltd. for everyone.