How to improve the corrosion and wear resistance of lithium battery filling pumps?

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Regarding how to improve the corrosion resistance and wear resistance of liquid injection pumps, here is my preliminary summary. If anyone has experience in this area, I hope we can discuss it more and work together to draw conclusions, so that we can all make progress. How to improve the resistance of pump flow channels to rust, corrosion, and abrasion is an issue that acid-resistant pump and valve manufacturers must consider. During the operation of the pump, its efficiency is influenced by various factors. In this article, questions will be raised as well as solutions provided. If no treatment is applied to the surfaces of the pump casing and impeller of fluorocarbon pumps, prolonged operation of the pump will cause wear on the smoothness of these surfaces, resulting in unevenness. During normal use, since fluorinated liner pumps are often used to transport corrosive fluids or even those containing particles, dirt tends to accumulate inside the pump during operation, which reduces the pump’s volume and also increases the friction coefficient associated with the fluid being transported. During the operation of the motor, electrochemical corrosion can also cause certain cavitation effects on the impeller. During the transport of the medium inside the pump, under the action of certain medium erosion, the inner walls of the pump and the impeller become rough and uneven; coupled with the increased friction mentioned earlier, the efficiency of medium transport also declines. To address the issue mentioned above, manufacturers of corrosion-resistant pumps typically use polymer composite coating materials in the pump’s flow channels, especially on the surfaces where fluid passes through and on the impellers. This improves the surface finish of the pump; the surface finish of such coatings is 20 times better than that of stainless steel itself. Such a pump surface reduces the losses in volume and medium transport caused by friction, thereby improving the transportation efficiency of the pump valve. At the same time, excellent coating materials are polymeric polymers that can effectively reduce contact between the medium and the flow-through components, thereby minimizing electrical corrosion and rusting of the pump body. Of course, when problems arise with fluoropolymer-lined pumps that have been in use for a long time, this composite material can also be used for repairs, such as repairing the surface of the pump body or applying a coating to provide overall protection to that surface. The protected surface of the pump body extends the service life of the impeller, thereby prolonging the overall service life of the pump. In addition to the flow-through components inside the pump, there is also the sealing gland in corrosion-resistant pumps, which is a detail that technicians often overlook. For this detail, it is necessary to ensure both corrosion resistance and resistance to loosening. If the gland at the sealing point becomes loose, it generally causes some deformation in the screw holes on the sealing gland. This deformation may be caused by wear from fluid flow, or it may be caused by wear from hard objects. In such cases, it is more likely that the issue is caused by wear from hard objects, but the solution is the same as mentioned earlier: applying a high-polymer material to the surface is one way to address it. If that’s not the reason, consider other aspects such as the operation of the pump, the concentricity of the shaft, and so on. Among these, the issue of pump concentricity is also one that is not easy to resolve; the clamping of the components during processing, as well as the processing techniques and parameters, require some auxiliary equipment for measurement. Finally, let’s address another often-discussed topic: the operating speed of the pump. Operating the pump at flow rates below the minimum value increases the radial load vibrations on the pump, intensifies fluid circulation, and shortens the lifespan of the bearings and mechanical seals. Therefore, even when the friction coefficient of all components subject to flow is low, if other necessary measures are not taken, fluoroplastic pumps as well as other corrosion-resistant pumps will not be able to function effectively.