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PHOSPHATE COATINGS
2009-06-05

Phosphate coatings consist of crystalline, non-reflective, water insoluble metal phosphates that are very adherent to the base metal. They can be associated in three main categories:
       ZINC PHOSPHATE
  • Heavy zinc phosphate that has the ability to retain rust inhibiting oils, preservatives, or other specified finishes.
  • MIL-DTL-16232, Type Z
  • Lighter zinc phosphate has a smoother crystal structure and is normally not oiled as it is used as a base for paint.
  • DOD-DTL-16232, Type Z
  • TT-C-490, Various Types and Methods
  • DOD-P-50002, Type Z
  • MANGANESE PHOSPHATE
  • Chosen for wear resistance and the ability to retain oils.
  • DOD-DTL-16232, Type M
  • DOD-P-50002, Type M

     
  • IRON PHOSPHATE
  • Utilized as a paint or powder coating base.
  • There are numerous proprietary phosphate baths within each group that meet specific part requirements.

 

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