Brief Introduction to PFA Coating for Chemical Storage Tanks
Information summary：Chemical storage tank spraying PFA (perfluoroalkoxy resin) is a professional spraying process that forms a uniform layer of PFA coating on the inner or outer wall of the tank. The core purpose is to use PFA's corrosion resistance, high temperature resistance, and non adhesiveness to solve the problems of equipment loss and medium pollution when storing highly corrosive and high-temperature media i
Chemical storage tank spraying PFA (perfluoroalkoxy resin) is a professional spraying process that forms a uniform layer of PFA coating on the inner or outer wall of the tank. The core purpose is to use PFA's corrosion resistance, high temperature resistance, and non adhesiveness to solve the problems of equipment loss and medium pollution when storing highly corrosive and high-temperature media in chemical storage tanks. This can be briefly explained from three key dimensions:
1. Core function: resist strong corrosion and ensure storage security
PFA is a fluorinated polymer material with the characteristic of "almost resistance to all chemical media", and has no reaction to strong acids (such as sulfuric acid, nitric acid), strong bases (such as sodium hydroxide), strong oxidants (such as hydrogen peroxide), and organic solvents (such as methanol, acetone). After spraying, the coating can isolate the direct contact between the storage tank substrate (mostly steel and stainless steel) and corrosive media, avoiding corrosion perforation of the substrate and preventing contamination of the media due to contact with metals (such as metal ion leaching). It is suitable for storing high-purity chemical raw materials or highly corrosive liquids.
2. Key Performance: Adapt to the stringent requirements of chemical storage
High temperature resistance: The long-term use temperature can reach 260 ℃, and the short-term can withstand high temperatures above 300 ℃. It can meet the storage requirements of some high-temperature media (such as high-temperature reaction liquids and steam tracing conditions), and the coating does not soften or decompose at high temperatures.
Non stick and easy to clean: PFA has a low surface tension, making it difficult for the medium (especially viscous liquids and slurries) to adhere. There is no need for complex processes during tank cleaning, reducing the risk of residual pollution and lowering cleaning costs.
Mechanical stability: The coating has strong adhesion with the substrate, is not easy to peel off or crack, and can withstand long-term immersion and slight impact of the medium.
3. Basic process: Ensure uniform coating quality
Generally, it needs to go through the steps of "substrate pretreatment (rust removal, oil removal, sand blasting and roughening) → spraying PFA powder/lotion (electrostatic spraying, flame spraying, etc.) → high temperature curing (melting the coating to form a film, forming a dense protective layer) → post-treatment (checking the thickness, flatness, and repairing defects)" to form a continuous coating with uniform thickness (generally 0.1-0.5mm) and no pinholes to ensure the protective effect.
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