MIL-DTL-16232G
4.7.5.1 Salt spay (fog). Accelerated corrosion resistance by salt spray (fog)
shall be performed in accordance with the following:
a. Subject the samples to a 5 percent salt spray test as described in
ASTM B 117.
b. Exposure times for coatings tested prior to supplementary
treatment shall be in conformance with TABLE II.
c. Exposure time of coatings tested after application of
supplementary treatment shall be in accordance with 3.7.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified
in the contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD
personnel, these personnel need to contact the responsible packaging activity to ascertain
requisite packaging requirements. Packaging requirements are maintained by the Inventory
Control Point's packaging activity within the Military Department or Defense Agency, or within the
Military Department's System Command. Packaging data retrieval is available from the
Managing Military Department's or Defense Agency 's automated packaging files, CD-ROM
products, or by contacting the responsible packaging activity.
6. NOTES
6.1 Intended use. The "heavy" phosphate coating 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 coating may be used when paint
and supplemental oil coatings are required on various parts or assemblies.
6.1.1 Type M. Type M coatings are more resistant than type Z to alkaline environments.
Type M coatings should not be exposed to temperature in excess of 121 C (250 F). Except for
special purpose applications, phosphate coatings should be used with a suitable supplementary
treatment. Each class for type M is described below:
a. Class 1 allows the procuring activity to specify a suitable supplementary
treatment depending upon the particular application.
b. Class 2 covers coatings impregnated with MIL-PRF-3150 lubricating oil or MIL-
PRF-16173, Grade 3 rust preventive. This class may be specified for general purpose
applications in which a moderate degree of corrosion resistance is required during storage, to
prevent wear, and assist in the "breaking-in" of bearing surfaces. Supplemental oil may be
removed from phosphate coated items by contact with absorbing material.
c. Class 3 covers coating without supplementary treatment. This class is
intended for special purposes in which a supplementary treatment is not desired.
d. Class 4 covers chemically converted coatings, chemically converted with
supplementary treatments that are suitable for use where corrosion protection is required in
addition to other properties (see 1.2). This coating is recommended for use where a dyed or
colored coating such as olive drab or black (non-reflective) coating is needed. The class 4
coating provides improved corrosion resistance; however, the supplementary coating provides
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