Reasons for corrosion of impeller in high corrosion and wear resistant multistage pump

Category: Water pump knowledge

2025-05-14

High-corrosion-resistant and wear-resistant multi-stage pumps are widely used in industrial fields. Their stable performance, large flow rate, and high pressure are favored by users. However, during use, the impeller corrosion problem gradually becomes apparent, which directly affects the pump's performance and service life. Let's discuss the reasons for impeller corrosion in high-corrosion-resistant and wear-resistant multi-stage pumps.

I. Chemical Corrosion

When the medium contains corrosive chemicals, it will react chemically with the impeller material, causing the impeller to corrode. This is especially true in the chemical and pharmaceutical industries, where the medium contains higher levels of acids, alkalis, and salts, making chemical corrosion more likely.

II. Electrochemical Corrosion

Electrolytes in the medium will form tiny primary batteries on the impeller surface, generating current and causing electrochemical corrosion. This type of corrosion is particularly noticeable in humid environments and is common in media containing chloride ions, sulfate radicals, etc.

III. Mechanical Wear

In addition to chemical corrosion, mechanical wear is also one of the important reasons for impeller corrosion. During the process of fluid passing through the pump, solid particles will impact and wear the impeller surface, leading to material loss.

IV. Environmental Factors

Under high-temperature and high-pressure environments, the corrosion rate of the impeller will increase. In addition, environmental factors such as humidity and oxygen content in the medium will also affect the corrosion of the impeller.

To solve the above problems, we can take the following measures:

I. Select Corrosion-Resistant Materials

Select appropriate impeller materials based on the properties of the medium, such as stainless steel and titanium alloys.

II. Optimize Pump Design

Reasonably design the pump's flow path to reduce the impact of the fluid on the impeller and reduce mechanical wear.

III. Control Environmental Factors

Try to reduce the temperature, humidity, and chemical component content in the operating environment to reduce the corrosion rate.

IV. Regular Maintenance and Inspection

Regularly maintain and inspect the pump to promptly identify and repair corrosion problems and ensure the normal operation of the pump.

In summary, there are various reasons for impeller corrosion in high-corrosion-resistant and wear-resistant multi-stage pumps, including chemical corrosion, electrochemical corrosion, mechanical wear, and environmental factors. To extend the service life of the pump, we need to take measures from material selection, design optimization, environmental control, and regular maintenance to reduce the corrosion rate of the impeller.

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