Plate Heat Exchanger Corrosion
Corrosion is a very important damage reason of the plate heat exchanger, and plate heat exchanger corrosion is ubiquitous. It can solve the fundamental problem of heat exchanger damage if you can solve the corrosion problem.
1. Crevice Corrosion: The main corrosion occurs in the gaps of the phe metal parts , which is caused by the electrochemical imbalance of the retentate.
2. The point (hole) etch is a highly localized corrosion pattern. The metal surface that resists corrosion by the passivation film is destroyed to form a deep pit. As the corrosion deepens, the plate may be perforated or corroded.
3. Hydrogen damage corrosion: Hydrogen damage may also occur for the material of the plate heat exchanger.
4. Stress Corrosion: The interaction between the residual stress generated by static stretching and the electrochemical causes local corrosion or fracture of the metal. If residual stress is generated after pressing the plate, stress corrosion cracking occurs once the halogen ions in the sheet contact each other.
5. Intergranular corrosion: Intergranular corrosion is generally produced on austenitic and ferritic stainless steels, and do not occur on pure titanium or pure nickel. It is due to the corrosion from the phe metal surface and the internal corrosion along the grain boundary, so that the ability of the grain bonding force is weakened or lost, then the strength of the material is weak and the corrosion occurs.
6. Corrosion fatigue: The damage of the contact parts between the phe plates may be related to corrosion fatigue.