MIL-DTL-16232G
d. Calculation: Weight per unit area of phosphate coating.
W (g/m2)= (Initial weight in grams-final weight in grams)
Total area in square meters
4.7.3.2 Type Z coatings. Weight per unit area of type Z coatings, prior to supplementary
treatment, shall be determined in accordance with the following:
a. Weigh the coated test specimen to the nearest mg; remove the coatings by
immersion at the room temperature for a minimum of 10 minutes in a stripping solution conforming
to TABLE IV. (If desired, the chromic acid stripping solution described in 4.7.3.1a may be used.)
b. Rinse in clean, running water, dry and reweigh.
c. Repeat the procedure until a constant weight is obtained.
d. If a supplementary treatment is present, it shall be removed prior to testing as
described in 4.7.3.1c. The coating weight shall be calculated as described in 4.7.3.1d.
TABLE IV. Stripping solution for type Z coatings.
Material
Nominal Quantity
Sodium hydroxide
125 g
Tetrasodium
125 g
ethylenediaminetetraacetic acid
(4NaEDTA)
Water to make
1000 ml
4.7.4 Weight of supplementary treatment. Weight per unit area of
supplementary treatment shall be determined in accordance with the following:
a. Age the test samples for a minimum of 16 hours at room
temperature or dry at approximately 51.5oC (125oF) for a minimum of 3 hours.
Cool in a desiccator and weigh accurately.
b. Completely remove the supplementary treatment by immersing in
successive baths of petroleum ether or naphtha.
c. Rinse the sample in alcohol, dry, and reweigh.
d. Determine the weight of the treatment per unit area using the
following calculation:
e. Calculation: Weight per unit area of supplementary treatment
W(g/m2) = Initial weight in grams-final weight in grams)
Area in square meters
4.7.5 Accelerated corrosion resistance. Accelerated corrosion resistance
shall be determined in accordance with 4.7.5.1.
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