MIL-DTL-16232G
Table II. Accelerated corrosion resistance.requirement
(free of supplementary coating)
Coating system
Exposure time, minimum
Type
Class
Salt spray, hours
I
1.5
M
2
M
1.5
3
M
1.5
4
M
24
1
Z
2
2
Z
2
Z
3
2
Z
4
24
3.7.2 Type M, class 2. The supplementary treatment for class 2 of type M shall be treated
with lubricating oil conforming to MIL-PRF-3150 or MIL-PRF-16173, Grade 3. Unless otherwise
specified, (see 6.2), the weight of oil per unit area shall be such that items shall no signs of
corrosion when subjected to the salt spray test for a minimum of 48 hours.
3.7.3 Type M, class 4 systems. Type M, class 4 shall be manganese base phosphate
coatings that have been chemically converted by reaction with a reagent containing an inorganic
salt. When specified (see 6.2), items shall receive supplementary treatment or be dyed to a
specific color after chemically converting the phosphate coating. Class 4 coatings shall show no
signs of corrosion when subjected to the salt spray test when subjected to a minimum of 72 hours
only if supplementary treatment is applied.
3.7.4 Type Z, class 2. Type Z, class 2 coatings shall be treated with corrosion preventative
conforming to MIL-L-3150 or Grade 3 of MIL-PRF-16173. Unless otherwise approved (see 6.2),
the weight per unit area of corrosion preventive shall be such that items shall show no signs of
corrosion when subjected to the salt spray test for a minimum of 72 hours.
3.7.5 Type Z, class 4 systems. Type Z, class 4 systems shall be zinc base phosphate
coatings which have been chemically converted by reaction with a reagent containing an
inorganic salt. When specified (see 6.2), items shall receive supplementary treatment or be dyed
to a specific color after chemically converting the phosphate coating. Class 4 coatings shall show
no signs of corrosion when subjected to the salt spray test for a minimum of 72 hours only if
supplementary treatment is applied.
3.8 Dimensions of coated items. Items shall comply with dimensional requirements of the
drawings prior to application of the phosphate coating. After coating, items shall comply with the
7
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