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Zinc Phosphate Bath Fluid

When metal parts need to be corrosion resistant, a zinc phosphate conversion coating is often applied. The zinc combines with phosphoric acid and the surface metal of the part to form a layer of insoluble crystalline phosphates, which protects the part from corrosion. The zinc phosphate solution is either sprayed on the part, or more commonly, the part is immersed in a zinc phosphate bath. This approach is widely used in the automotive industry and in certain sectors of the appliance and electronics industries. Zinc phosphate baths are also common for electroplated, electrocoated and powder coated parts.

See our video of the Dump Cycle from cleaning a 6,000 gallon Zinc Phosphate Tank.
We replaced a Pressure Filter, which had been in place for many years. The customer stated, “CentraSep took out more solids in one day than our other system would do in a week!”

Industrial metal mold blank

The zinc phosphate bath fluid is composed of zinc, phosphoric acid, water and an etching compound. A by-product of this coating process is a sludge that forms and settles to the bottom of the immersion tank. As more of this zinc phosphate sludge accumulates in the tank, the coating process becomes less efficient. Thus, the tanks require periodic cleaning to remove this sludge.

CentraSep® offers a highly effective way to keep the zinc phosphate bath fluid clean and sludge-free. The zinc phosphate bath fluid continually circulates through the centrifuge filtration system, where the centrifugal force is more than 2,000 times the force of gravity. Even the smallest micro-particles of zinc phosphate are removed from the zinc phosphate bath fluid. The resulting clean fluid is then continually recycled and reused in the zinc phoshate coating process. By properly and continually filtering and separating the zinc phosphate particles out of the bath fluid, the coater is ensured of a smooth, efficient process, where perfect chemical balances and temperatures are maintained, and downtime is virtually eliminated.

While the zinc phosphate coating industry continues to become more competitive, it is important for a coater to establish any and all competitive advantages available. The coaters implementing CentraSep zinc phosphate bath fluid filtration systems are seeing increased production, decreased costs and higher profits. Our ultra-efficient and effective zinc phosphate bath filtration systems can dramatically and positively impact a coater’s bottom line. We have an experienced and dedicated team of Filtration Engineers, technicians and manufacturing personnel that truly understand the zinc phosphate coating industry, and they are ready to work with your team to develop a centrifuge based filtration and separation solution that not only works extremely well, but one that requires virtually no maintenance.

CentraSep is the proven leader in zinc phosphate bath fluid filtration. Since 1981, CentraSep has specialized in solving filtration and separation problems through advanced science and application engineering. This problem-solving approach is showcased in our zinc phosphate bath fluid filtration systems, where we listened to coater’s needs, studied their problems and developed the most effective process possible. CentraSep can offer you savings by reducing labor, filter media expenses, inventory, disposal fees and water replacement costs. Contact us today to see how CentraSep can help you with your zinc phosphate bath fluid application.

Benefits of the CentraSep Zinc Phosphate Bath Fluid Filtration System:

  • Eliminates tedious and expensive “pump and shovel” tank cleaning operations.
  • Improves heat transfer in the coating process.
  • Eliminates the need for media paper and its disposal fees.
  • It is a fully automatic system requiring very little monitoring.
  • Offers the lowest maintenance in the Industry.
  • Maximizes your zinc phosphate fluid life.
  • Reduces your waste stream / recyclable waste.
  • Constructed of 316 stainless steel (standard).
  • Reduces pollution and environmental impact.
  • Capable of separating solids to the single micron.
  • Has an optional LIFETIME WARRANTY available.
  • Incorporates the experience of numerous domestic and international installations.

CentraSep is more than a centrifuge manufacturer; we are a Filtration Engineering Solutions Company.

Talk to one of our Engineers today to see how we can help with your zinc phosphate bath fluid filtration and separation needs.

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