Reasons for impeller corrosion in high-flow, high-head multistage pumps

Category: Water pump knowledge

2025-06-17

High-flow, high-head multistage pumps are widely used in water supply, irrigation, and industrial fields. Their stable performance, high flow rate, and high head make them popular with users. However, impeller corrosion is a common problem during use, affecting not only pump performance but also shortening its lifespan. Below, we will explore the causes of impeller corrosion in high-flow, high-head multistage pumps.

1. Chemical Corrosion: When the medium contains corrosive chemicals, it will react chemically with the impeller surface, causing material corrosion. For example, media containing acids, alkalis, and salts will corrode the impeller material.

2. Electrochemical Corrosion: When electrolytes are present in the medium, the impeller material may undergo electrochemical reactions with other substances in the medium, causing electrochemical corrosion. This type of corrosion is common in humid environments or media containing electrolytes.

3. Erosion Corrosion: As the medium flows within the pump, high-velocity water flow scours the impeller surface, making it easier for corrosive substances in the medium to contact the impeller surface, accelerating the corrosion rate.

4. Dissolved Oxygen Corrosion: Dissolved oxygen in water can cause oxidation reactions on the metal surface, leading to corrosion. This is particularly true in high-temperature, high-pressure environments where dissolved oxygen is more corrosive.

5. Microbial Corrosion: Microorganisms in the medium can adhere to and grow on the impeller surface, and their metabolic products can corrode the impeller material.

6. Material Issues: Improper selection of impeller material is also a major cause of corrosion. Different media require different impeller materials; improper material selection will result in insufficient corrosion resistance.

7. Improper Operation: Failure to start or stop the pump according to regulations can cause excessive fluctuations in parameters such as medium flow rate and temperature, thereby increasing impeller corrosion.

To extend the service life of high-flow, high-head multistage pumps, the following measures should be taken to prevent impeller corrosion:

1. Select appropriate materials to ensure the impeller has sufficient corrosion resistance.

2. Control the quality of the medium to reduce the content of corrosive substances.

3. Optimize pump operating procedures to ensure parameter stability.

4. Regularly maintain and inspect the pump to promptly identify and address corrosion issues.

In summary, there are many reasons for impeller corrosion in high-flow, high-head multistage pumps. Measures must be taken from multiple aspects to prevent and mitigate corrosion.

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