Pool Pump Efficiency: Corrosion Prevention Tips


Ways To Avoid Corrosion Of Swimming Pool Water Pumps

Ways To Avoid Corrosion Of Swimming Pool Water Pumps

Release time:2022.08.01

It is universally acknowledged that swimming pool water pumps may easily be corroded and thus lower their working efficiency. Therefore, Ways to prevent the pool pumps from being corroded are necessarily needed to become the most energy efficient pool pumps.

1) Wear and corrosion refer to the erosion and corrosion of metal surfaces by high-speed fluids. Fluid erosion is different from erosion caused when the medium contains solid particles. Pool pumps will wear out during operation, so we should try our best to use materials with good wear resistance to reduce their wear and corrosion. Of course, different materials have different anti-wear and corrosion properties.

2) Electrochemical corrosion refers to the electrochemical process in which the contact surface of dissimilar metals forms a battery due to the difference in electrode potential between metals, thereby causing the anode metal to corrode. To prevent electrochemical corrosion, one is to use a sacrificial anode to protect the cathode metal, while the other is to use the same metal material for the flow channel of the pump.

3) Inter-granular corrosion is a kind of local corrosion, mainly refers to the phenomenon of chromium carbide precipitation between stainless steel crystal grains. Inter-granular corrosion is extremely corrosive to stainless steel materials. The measures to prevent inter-granular corrosion are: annealing the stainless steel or using ultra-low carbon stainless steel (C<0.03%).

4) Uniform corrosion refers to the uniform chemical corrosion of the entire metal surface when corrosive liquid contacts the metal surface. This is the most common type of corrosion, and it is also the least harmful type of corrosion. The measures to prevent uniform corrosion are: adopt suitable materials (including non-metals), and consider sufficient corrosion margin when designing the pump.

5) Crevice corrosion is a kind of local corrosion, which refers to the corrosion caused by the partial destruction of the metal passive film due to the decrease of oxygen content in the crevice and the decrease of pH value after the crevice is filled with corrosive liquid.

6) Pitting corrosion is localized corrosion. The partial destruction of the metal passive film causes the rapid formation of hemispherical pits in a certain local area of the metal surface. This phenomenon is called pitting corrosion.

7) Cavitation corrosion. The corrosion caused when the pump cavitation occur is called cavitation corrosion. However, cavitation of swimming pool water pumps cannot be prevented. Cavitation will occur more or less during the operation of swimming pool water pumps. For those pumps that often produce cavitation corrosion, cavitation-resistant materials can be used to increase their cavitation resistance.

To conclude, several methods mentioned above are available to achieve the most energy efficient swimming pool water pumps.