Analysis of the causes of impeller corrosion
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The image shows the impeller of a desalinated water pipeline pump, which is severely corroded. Please help identify the reasons for this, fellow sailors.
Check whether the added chemicals are appropriate, and analyze the deionized water
Judging from the photos, it is typical cavitation rather than electrochemical corrosion~~~
It’s cavitation, not the corrosion you mentioned
Surface corrosion, which may be related to water quality. The blades have cavitation pores; the effect of cavitation can be ignored
What is the pH value of desalinated water? What is the conductivity? Normally, desalinated water is neutral; however, due to the inevitable inclusion of air, its pH is usually slightly acidic.
It is mainly caused by cavitation, but it is also necessary to monitor all the quality parameters of the deionized water.
It is either corrosion with holes in the blades or cavitation; it is likely that the deeper degree of corrosion has caused some of the tissue to be eroded away. The most noticeable effect of cavitation is damage concentrated at the inlet area of the blades, involving large-scale destruction. Damage characterized by several small holes in localized areas should not be caused by cavitation.
1. Even without operation, soaking in saltwater can still cause corrosion. 2. It seems that cavitation is the main issue with these impellers