MIL-DTL-16232G
TABLE I. Hydrogen embrittlement heat treatment.
Coating Type
Material
Hardness
Heat treatment
Stage of
Rockwell C
operation
(minimum)
98 to 107oC
Heat treatment
Z
Alloy steel
39
(210 to 225oF)
for both types
Carbon steel
39
of coatings and
for 8 hours or
material is
room
temperature for
conducted after
coating but
120 hours
before any
98 to 107oC
M
Alloy steel
39
stressing
(210 to 225oF)
operation
Carbon steel
39
for 8 hours or
room
temperature for
120 hours
3.5 Weight of phosphate coatings. The weight of phosphate coatings, prior to application of
any supplementary treatment, shall conform to the following:
a. Type M shall be a minimum of 16 grams per square meter (g/m2) (11 g/m2 when
specified (see 6.2))
b. Type Z shall be a minimum of 11 g/m2
3.6 Accelerated corrosion resistance. The phosphate coated item, free of supplementary
treatment, shall be subjected to a salt spray (fog) test. It shall show no evidence of corrosion for
the period of time shown in Table II.
3.7 Supplementary treatments. Supplementary treatments shall be applied after completion
of the phosphating process. Items receiving supplementary treatment shall be either centrifuged
or permitted to drain sufficiently to remove all surplus from the surfaces. Unless otherwise
specified (see 6.2), the supplemental oil coating weight shall be sufficient to meet the salt spray
requirements of 3.7.2 and 3.7.4.
3.7.1 Types M and Z, class 1. The supplementary treatment for class 1 of types M and Z
shall be as specified (see 6.2). Unless otherwise specified, weight of oil per unit area does not
apply.
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