The preventive measures for the corrosion of the inner wall of the stainless steel reactor can be started from the aspects of design, material selection, surface treatment, operation and maintenance. The following are some specific preventive methods:
1. Material selection and surface treatment
- Select corrosion-resistant materials: Select suitable stainless steel materials according to the properties of the reaction medium, such as 316L, 304L, etc. These materials have better corrosion resistance.
- Pickling passivation treatment: A dense passivation film is formed on the surface of stainless steel through pickling passivation to enhance its corrosion resistance.
- Coating protection: Spray anti-corrosion coating on the inner wall of stainless steel reactor, such as using thermal spraying technology to form metal primer coating and anti-corrosion coating, and apply sealing agent to seal the holes.
- Alloy patch lining: Use alloy patch lining layer, and enhance the anti-corrosion ability of the inner wall by combining spot welding and hot melt bonding layer.
2.Design optimization
- Reduce the space for medium retention: When designing, the space in the stainless steel reactor where corrosive media are easily retained should be minimized to increase the fluidity of the medium.
- Optimize the structure: For example, the closed pipe (such as manhole) on the horizontal plane is designed on the vertical surface to avoid the local accumulation of media to form a corrosive environment.
- Smooth transition: Each metal joint should be processed to be smooth and round, and passivation treatment should be performed when necessary to reduce stress concentration and corrosion risks.
3. Operation and maintenance
- Strict control of process parameters: Avoid over-temperature and over-pressure operation, strictly control the temperature of jacket and stainless steel reactor, and prevent the superposition of temperature difference stress and internal pressure stress.
- Regular cleaning: Use special cleaning agent or chemical cleaning method to remove dirt and corrosive substances in the reactor.
- Avoid pollution: Prevent organic juice, acid, alkali and salt substances or heterogeneous metal particles from adhering to the surface of stainless steel reactor to avoid electrochemical corrosion.
- Inspection and repair: Regularly check whether there are signs of corrosion on the inner wall of stainless steel reactor, and repair damaged protective layer or coating in time.
Through the above measures, the corrosion of the inner wall of the stainless steel reactor can be effectively prevented, the service life of the equipment can be extended, and the safety and stability of the production process can be ensured.
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