PHOSPHATE COATINGS

PHOSPHATE COATINGS   are conversion coatings that produce a uniform, adherent, non-metallic, non-reflective, crystalline, water insoluble finish on iron or steel. The two most common phosphate coatings are Zinc Phosphate and Manganese Phosphate. These adhesive coatings provide an excellent base for painting. Coating thickness for zinc phosphate is between .0002 and .0006 inches and manganese phosphate coatings are typically between .0002 and .0004 inches thick.

APPEARANCE:   The color of zinc and manganese phosphate coatings range from gray to black. These coatings are typically followed by a supplementary treatment of lubricating oil conforming to military specifications.

CORROSION RESISTANCE:   Phosphate coatings treated with a suplementary corrosion preventative (oil or other corrosion inhibitor) offer excellent resistance to corrosion. Zinc based coatings provide higher corrosion resistance than manganese.

OTHER PROPERTIES:   Phosphate coatings readily absorb lubricating oils to prevent galling, scuffing, scoring, or seizing of moving parts. Manganese coatings are more resistant to alkaline environments than zinc coatings. Manganese provides more resistance to heat than zinc phosphate coatings, but should not be exposed to temperatures above 400° F. Zinc phosphate coatings should not be used on parts where contact with alkaline materials or temperatures above 225° are expected.

SUMMARY:   Phosphate coatings are used extensively as a base for paint in governmental, commercial, and consumer products. It has applications in the automotive, machine tool, firearms, appliance, hardware, heavy equipment, and many other industries.

SPECIFICATIONS:   Acton Metal Processing Corp. provides MANGANESE AND ZINC PHOSPHATE finishes that conform to the following specifications:

Phosphate Coating, Heavy, Manganese or Zinc Base
 
MIL-DTL-16232, Type M, Class 1    Manganese phosphate & supplementary preservative 
                                  treatment or coating, as specified.
 	 
MIL-DTL-16232, Type M, Class 2    Manganese phosphate & supplementary treatment 
                                  with lubricating oil conforming to MIL-PRF-16173, 
                                  Grade 3 or MIL-PRF-3150.

MIL-DTL-16232, Type M, Class 3    Manganese phosphate - no supplementary treatment.

MIL-DTL-16232, Type Z, Class 1    Zinc phosphate & supplementary preservative 
                                  treatment or coating, as specified.

MIL-DTL-16232, Type Z, Class 2    Zinc phosphate & supplementary treatment with 
                                  lubricating oil conforming to MIL-PRF-16173, 
                                  Grade 3 or MIL-PRF-3150.

MIL-DTL-16232, Type Z, Class 3    Zinc phosphate - no supplementary treatment.

DOD-P-16232, Type M, Class 1      Manganese phosphate & supplementary preservative 
                                  treatment or coating, as specified.

DOD-P-16232, Type M, Class 2 	  Manganese phosphate & supplementary treatment 
                                  with lubricating oil conforming to 
                                  MIL-L-3150.

DOD-P-16232, Type M, Class 3 	  Manganese phosphate - no supplementary treatment.

DOD-P-16232, Type Z, Class 1 	  Zinc phosphate & supplementary preservative 
                                  treatment or coating, as specified.

DOD-P-16232, Type Z, Class 2 	  Zinc phosphate & supplementary treatment with 
                                  lubricating oil conforming to MIL-L-3150.

DOD-P-16232, Type Z, Class 3 	  Zinc phosphate - no supplementary treatment.

GM 4435-M, Code A 	          General Motors phosphate type protective finish 
                                  with protective oil.

GMW 3179, Code A 	          General Motors zinc phosphate protective finish 
                                  with protective oil.

SAE AMS 2481 	                  Phosphate Treatment Anti-Chafing

PS-0211 	                  Dresser-Rand Company Phosphate Treatment 
                                  Anti-Chafing

BFD319019 	                  BAE Systems - Pretreatments

MIL-STD-171E Finish No. 5.3.1.1   Manganese phosphate base, DOD-P-16232, Type M, 
                                  Class 1, supplementary treatment or coating, 
                                  as specified.

MIL-STD-171E Finish No. 5.3.1.2   Manganese phosphate base, DOD-P-16232, Type M, 
                                  Class 2, supplementary treatment with lubricating 
                                  oil conforming to MIL-L-3150.

MIL-STD-171E Finish No. 5.3.1.3   Manganese phosphate base, DOD-P-16232, Type M, 
                                  Class 3, with no supplementary treatment.

MIL-STD-171E Finish No. 5.3.2.1   Zinc phosphate base, DOD-P-16232, Type Z, 
                                  Class 1, supplementary treatment or coating, 
                                  as specified.

MIL-STD-171E Finish No. 5.3.2.2   Zinc phosphate base, DOD-P-16232, Type Z, 
                                  Class 2, supplementary treatment with lubricating 
                                  oil conforming to MIL-L-3150.

MIL-STD-171E Finish No. 5.3.2.3   Zinc phosphate base, DOD-P-16232, Type Z,
                                  Class 3, with no supplementary treatment.

Phosphate Coating, Light, Manganese or Zinc Base
 
TT-C-490, Type I                  Zinc phosphate immersion or dip application.
TT-C-490, Type V                  Zinc phosphate (500 mg/ft² min - 1100 mg/ft² max) 	 
88-1-240X                         Instron lightweight manganese phosphate coating.
SAE AMS 2480                      Phosphate Treatment, Paint Base
MIL-STD-171E Finish No. 5.1.1     Zinc phosphate base, TT-C-490, Type I

Additionally, our phosphate processes meet or exceed the custom specifications of most major U.S. companies. If you have a question about a particular phosphate specification, please call us and ask.


CAPABILITIES:   Our facilities and highly skilled technicians are able to meet your phosphate finishing needs. We operate a fully automatic finishing line and three rack, basket and hoist lines. With this capability, we can accomodate jobs of most any size, ranging from small machine screws to large heavy steel plates. Acton Metal Processing Corp. is your source for cost-effective phosphate finishes.

Finishing Services Menu

Acton Metal Processing Corp. provides many metal finishes including:

 
 
 
 
 
 

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