Iron Phosphate Conversion Coatings - Calculating Coating Weights.
Phosphate coating procedure -- NuKoat Series of Products
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For best results with Iron Phosphating these parameters should be followed for 35-50 mg/ft2 coating weights.
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Spray (superior coating and cleaning over immersion)
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Minimum Pressure: 300 PSI at >3 GPM
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Temperature: 120 -140 F
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Time: 60-180 Seconds (coating weights will increase with longer contact times).
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For a downloadable pdf file click here
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Start from the bottom and work vertically up surface for large pieces. Ensure complete impingement, under pressure, of NuKoat 33MF for a minimum of 60 seconds on entire surface. DO NOT ALLOW the surface to dry down during processing.
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Guidelines for achieving desired coating weights:
- Spray coating weights 25 - 50 mg/ ft2
- Temperature: 120 - 140 F
- Concentration: 2-4 % By volume
- Time: 1 - 2 minutes
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Laboratory Q-Panel Testing on mild 1010 steel: 120 F @ 2 % b.v., 90 sec will give coating weights of 30 - 45 mg/ft2
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NOTES:
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On cast iron coating weights will be slightly lower than mild steel. Use 130 - 140 F to get 30 - 45 mg/ft2.
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In cold weather or on cold metal surface, especially large pieces metal should be heated or processing could require an extra 30-60 seconds.
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Direct contact time is critical along with prior removal of surface grease and oils. NuKut 33 MF is designed to provide adequate cleaning of mildly soiled work pieces.
- Immersion with light agitation:
- mild steel (1010) - 120 F, @ 2 % b.v., 2 - 3 minutes, 35 - 50mg/sq. ft.
Back to NuKoat Line Card
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NOTES:
(1) Want to determine your own coating weights for all of your conversion coating processes or compare conversion coatings from one supplier to another. Click here for FEDERAL SPECIFICATION: TT-C-490E: CHEMICAL CONVERSION COATINGS AND PRETREATMENTS FOR FERROUS SURFACES (BASE FOR ORGANIC COATINGS)
GOVERNMENT/SCIENCE APPLICATIONS FOR CONVERSION COATINGS:
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Government Applications
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Navy (Std Missile, Phalanx, RAM, Tomahawk)
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Air Force (ACM, AMRAAM)
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NASA
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DOD Prime Contractors
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Industrial Applications
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aerospace
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boilers
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air conditioners
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fusion rollers (copiers, laser printers, etc)
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aluminum construction materials |
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