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HVOF Coating System for Cylinder Rods

HVOF (high velocity oxygen fuel) is the best clean and environmentally friendly thermal spray method for hydraulic actuators (cylinder rods) and Spencer has the equipment to do it. The HVOF process eliminates the use of chromic acid solutions that are known carcinogens and can cause a host of other health problems. It also improves performance of cylindrical metal parts, dramatically lengthening component and seal life. The coating provides:


  • High density, low porosity
  • Improved corrosion barrier
  • Higher hardness ratings
  • Improved wear resistance
  • High bond strength
  • Smoother as-sprayed surfaces
  • Increased impact resistance
  • A safer work environment for our people
  • 80% reduction in hazardous waste
  • Waste produced is considerably less hazardous than Hard Chrome Plating

The Process:

  • The HVOF process utilizes a material in powder form injected into a flame of supersonic gas. The material softens in the flame and forms a dense coating on the substrate.
  • The part to be coated must have chrome removed by stripping electrolytically or grinding
  • If the surface has been previously HVOF coated, the surface must be ground to remove any imperfections
  • Any area not to be coated must be masked off
  • The surface to be coated must be thoroughly grit blasted using aluminum oxide material-36 grit-the prepared surface must be kept clean from this point on
  • The workpiece is put into the HVOF thermal spray cabinet
  • During the spray process, the workpiece rotates at 300 surface feet per minute
  • Each pass applies 0.001” of coating
  • The workpiece temperature is not allowed to exceed 350 degrees Fahrenheit. The spray process can be stopped and started to limit this temperature HVOF.
  • Final surface finishing requires use of either diamond belts or diamond grinding wheels
  • It is necessary to not only grind but also super finish
  • The finished surface is measured and documented
  • The bond strength is >10,000 PSI

The turnaround time is quick which means shorter downtime. Estimated cylinder life improvement is as high as five times that of chrome, which means less opportunity for downtime.

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