[DOD-P-16232-F]
A coating for medium and low alloy steels.
Gray to black in color. Intended uses:
The "heavy" phosphate coatings covered
by this specification are intended as a base for holding/retaining supplemental
coatings which provide the major portion of the corrosion resistance.
"Light" phosphate coatings used for
a paint base are covered by other specifications such as TT-C-490. Heavy
zinc phosphate coatings may be used when paint and supplemental oil coatings
are required on various parts or assemblies.
Heavy coating (.0002-.0004" thickness)
is for corrosion and wear resistance.
Type M: Manganese phosphate
base coating (min. 16g/m² or 11g/m when specified).
Class 1: Supplementary preservative
treatment or coating, as specified.
Class 2: Supplementary treatment
with lubricating oil conforming to MIL-L-3150.
Class 3: No supplementary treatment.
Class 4: Chemically converted
(may be dyed to color as specified). With no supplementary coating or supplementary
coating as specified.
Type Z: Zinc phosphate base
coating, (min 11g/m).
Class 1: Supplementary preservative
treatment or coating as specified.
Class 2: Supplementary treatment
with preservative conforming to
MIL-C-16173. Grade 3 or MIL-L-3150
as alternative for very small parts.
Class 3: No supplementary treatment
Class 4: Same as class above.
Additional Reading on Phophate |
![Welcome to the TechPlate, Inc. - Phosphate Coating; Heavy [DOD-P-16232-F] page](techplate_top.jpg)
