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Parco Lubrite Phosphate Conversion Coating 

Do You Need a Parco Lubrite Phosphate Conversion Coating?



To reduce wear and galling on ferrous bearing surfaces, Parker offers Parco Lubrite conversion coating.  Properly cleaned parts are immersed in the Parco Lubrite solution which produces a coating of the phosphates of manganese and iron integrated with the ferrous surfaces.   This coating of crystals is friable, nonmetallic, and oil absorptive, and makes definite contributions to the performance and longevity of the treated parts.




1. Parco Lubrite manganese phosphate coating (also called Lubrizing)increases lubrication efficiency, with the oil absorptive property of the coating assuring an adequate and continuous oil film coverage on the bearing surfaces.You can see the comparative spreading rate of a drop of oil on a Parco Lubrited surface and similar untreated steel in the photo below.





2. You wouldn’t think of applying a quality paint without a primer base; consider how much more important the tenacity of oil is to a lubricated joint or assembly.Parco Lubrite manganese phosphate can be thought of as a primer for oil, holding it in the place where it is needed for constant service.

3. Manganese phosphate promotes rapid and safe break-in of mating parts by removing high spots and small irregularities in the microfinish of the surface to help smooth the bearing surfaces. After break-in, an even and fine distribution of tiny oil reservoirs remain, bridging the lowest areas and assuring continuing adequate lubrication as the oil spreads out.


4. Manganese phosphate prevents the welding of materials under high loads by interposing a chemical layer of inert phosphates between mating surfaces and thus acting as an anti-flux.The 100X photos below show the difference in a bare steel surface, a similar surface after Parco Lubrite, and the treated surface after coating removal.The coating is retained in the valleys and the reservoirs of oil contained in them will continue to guarantee a strong and continuous film of oil better than the un-treated surface.


5. Manganese phosphate prevents corrosion.In combination with oil, the dual-functioning system can even extend the life of the substrate by protecting steel from the deleterious effects of humidity.


6. Parco Lubrite manganese phosphate also removes metal burrs remaining from machining and finishing operations.In the fabrication of metal components by machining or abrasive operations, tiny burrs and fines are created over the finished surface.These burrs and metal fines can cause costly premature wear and devastating failure in hydraulics and other critically clean workpieces.Treatment of these articles in Parco Lubrite results in the preferential attack of these metal burrs by the solution, due to their small mass (compared to their larger surface area), with the result that they are attacked and dissolved first - and thus removed during the coating formation.Removal of such metal burrs and contaminant irregularities improves cleanliness and serves to reduce wear on bearing surfaces, extending product life.


The benefits of Parco Lubrite manganese phosphate coatings have been incorporated into the manufacturing sequence on a great many parts and components, and Parker Rust-Proof has been the first and foremost provider of this coating service since its inception in 1918.    We have coated, cylinder liners, piston rings, valves, tappets, rocker arms, camshafts, worm gears, shafts, pumps, pulleys, differential gears, ring gears and pinions, clutch parts, refrigeration pistons, compressor cylinders, bearing races, and universal joints.    We’ve coated tiny screws & pins for firearms, bearings for trains and space shuttles, critical fasteners for nuclear power plants, main bearings for aircraft engines, military armaments, 20 foot elevator shafts and radar mounts for aircraft carriers.   Give us a call and see if we can help you! 

parco lubrite photo.jpg

The comparative affinity for oil of a Parco Lubrite treated surface encourages the oil to spread faster and holds it tight to the steel surface, improving corrosion resistance.

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