Pumps for Metal Finishing and Plating
Why metal finishing is hard on pumps
A finishing line is a corrosion laboratory running at production pace. Pickling and stripping acids, plating baths, chromates, cleaners, and brighteners each attack equipment their own way, and bath chemistry shifts as proprietary additives are dosed and replenished, so the same named bath differs from plant to plant and month to month. Filtration and circulation loops run continuously, so the pump lives in the bath rather than visiting it. Rinse waters and drag-out are dilute but never clean. And the plating room atmosphere corrodes what the liquid misses: fumes attack motors, fasteners, and panels well away from any tank.
Approaches that get specified
Engineered thermoplastic pumps carry the bath transfer, filtration, rinse, and effluent duties with no metal in the wetted path, in the same room where metal equipment visibly suffers. Vertical thermoplastic sump pumps drain pits and containment areas that collect a little of everything the line uses. Sealless and magnetically driven designs remove the seal leak path on fluids that land on people and product when they escape. Corrosion-resistant air handling moves the fumes that would otherwise eat the building, and the effluent side of the line ties into the same neutralization equipment wastewater plants run.
How RE Merrill confirms the selection
Plating chemistry is too varied for chart-based answers, so we confirm each duty against curated compatibility data and factory guidance before we quote, and proprietary bath chemistries go to the factory with their supplier data. Send the duty: the bath or stream, its temperature, flow, head, and whether the service is circulation, transfer, sump, or feed, and we return a confirmed selection.
Related lines
Related reading
- Thermoplastic Pump Materials Guide: PVC, CPVC, PP, PVDF, ECTFE, and PTFE Compared
- Thermoplastic vs. Metal Pumps: Which Should You Specify?
- How to Choose a Corrosion-Resistant Centrifugal Pump