MIL-DTL-16232G
g. Permanent records of bath controls shall be maintained for not less than one year
(seven when specified, see 6.2) and made available to the Government upon request.
Permanent records shall be defined as legible records typed in hard copy or in an electronic
media acceptable to the procuring activity.
3.2.2 Degreasing. Degreasing shall be performed by solvent, vapor, alkaline or emulsion
cleaning. When alkaline or emulsion cleaning is used, thorough rinsing and drying shall be
performed prior to abrasive blasting.
3.2.2.1 Abrasive blasting. Abrasive blasting shall be used prior to heavy phosphating unless
otherwise specified on the drawing or in the contract (see 6.2). Rust or scale shall be removed by
dry, abrasive blasting using sand, steel grit, aluminum oxide, glass bead, plastic bead or other
ceramic type abrasives under the following conditions:
a. Parts shall be free of oil, grease, dirt and other contamination prior to abrasive
blasting.
b. Vibratory deburring shall not be used in lieu of blasting.
c. After blasting, abrasive residues shall be removed by a blast of dry compressed air.
d. Abrasive blasting shall be controlled and performed using a mesh size sufficiently fine
to preserve the required RMS finish when specified. (See 6.2)
e. The phosphating operation shall follow abrasive blasting with no intervening
processes.
3.2.2.2 Alternatives to abrasive blasting. When alternatives to abrasive blasting are specified
on the drawing or in the contract prior to phosphating, cleaning operations shall be followed by
thorough rinsing in clean water. Strong acids or alkaline solutions shall not be used prior to
phosphating without subsequent surface conditioning to refine the crystal structure and remove
the effect of such solutions on the surface reactivity and the phosphate coating process (see 6.5).
Alternate cleaning methods may be used, when specified, provided they do not adversely affect
coating weight, salt spray or hydrogen embrittlement properties.
3.2.3 Phosphating. The phosphate coating shall be applied by immersion under the following
conditions:
a. Type M coatings shall be manganese base and Type Z shall be zinc base. All
materials used for coatings shall be approved by the procuring activity as specified in 3.1.
b. The bath concentrations, temperature and immersion time for parts shall be such that the
phosphate coating meets all the requirements of this specification.
3.2.4 Water rinsing. The clear cold water rinse shall be performed in accordance with the
following:
a. Dip rinsing. A continuous overflow shall be maintained by the addition of fresh water.
Items shall be immersed only as long as necessary to meet the requirements of this specification.
b. The flow of rinse water shall be adjusted, regulated or controlled (for example by
conductivity controllers) in conjunction with the rate of production in order to prevent
contamination at anytime beyond a time limit that is such as to assure no detrimental effect on the
coatings produced.
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