MIL-DTL-16232G
dimensional requirements of the drawings, with allowance for the phosphate coating buildup.
(For interference in close fits, see 6.6).
3.9 Surface texture. Unless otherwise specified, items shall comply with the finish or surface
roughness requirements on the drawing prior to application of the phosphate coating. Surfaces for
which the roughness characteristics can be obtained by special mechanical/chemical operations
shall be so specified on the drawing or in the contract.
3.10 Workmanship. Phosphate coatings shall be evenly deposited, and shall have a uniform
crystalline texture with a pattern not readily visible to the unaided eye and shall not produce any
evidence of etching or intergranular attack of the base metal. Coatings shall be gray to black, and
shall not have a mottled appearance. They shall be free of white stains (due to dried phosphating
solution), rust, and fingerprints. However, brown or orange stains caused by chromic acid mix and
nonuniformity of color due to heat treatment, degree of cold work, or composition of the base metal
shall not be cause for rejection.
4. VERIFICATION.
4.1 Classification of inspections. The inspection requirements specified herein are classified
as follows:
a. Preproduction inspection. (see 4.4)
b. Conformance inspection. (see 4.5)
4.2 Inspection conditions. Unless otherwise specified (see 6.2), all inspections shall be
performed under the following conditions:
Temperature: Room ambient 18 to 35oC (65 to 95oF)
a.
b.
Altitude: Normal ground
c.
Vibration: None
d.
Humidity: Room ambient to 95 percent relative, maximum
4.3 Sampling.
4.3.1 Preproduction sample. When specified (see 6.2), preproduction samples of the item or
items to be phosphate coated shall be coated using the methods and procedures approved in
accordance with 3.1. The number of items shall be as specified (see 6.2). The sample items shall
be subjected to the preproduction inspection detailed in 4.4 at an activity as specified (see 6.2).
Acceptance of the preproduction sample shall be based on no defects.
4.3.2 Lot size. Unless otherwise specified (see 6.2), a lot shall consist of phosphated items of
the same base metal composition, type and class of coating, treated under approved process
control ranges, during one shift, in the same processing baths of approximately the same size and
shape, and to be submitted for acceptance at one time. In addition, where continuous or conveyor
equipment is used, a lot shall consist of a maximum of four consecutive hours of production.
4.3.3 Conformance inspection.
4.3.4 Process control. Sampling for process control testing shall be subject to the approval of
the procuring activity. The sampling plan shall be sufficient to demonstrate adequate control of the
process and conformance of products processed to the requirements of this specification or other
quality assurance provisions (QAPs), as specified.
4.3.5 Hydrogen embrittlement relief. Testing to determine the adequacy of the treatment for
hydrogen embrittlement relief shall be performed by the vendor or contractor at a frequency of 90-
120 days to assure that the embrittlement relief treatment is adequate.
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