MIL-DTL-16232G
TABLE III. Preproduction and quality conformance inspection.
Test or examination
Requirement
Method
Preproduction
Quality conformance
inspection
inspection
X
X
4.6.1 and 4.7.1
Bath materials
3.2.1
and controls
X
X
4.6.1 and 4.7.1
Degreasing
3.2.2
X
X
4.6.1 and 4.7.1
3.2.2.1
Abrasive blasting
X
X
4.6.1 and 4.7.1
3.2.3
Phosphating
X
X
4.6.1 and 4.7.1
3.2.4
Water rinse
X
X
4.6.1 and 4.7.1
3.2.5
Chromic acid rinse
3.3
Stress relief
X
(See note)
4.7.2
3.4
Hydrogen
embrittlment relief
X
X
4.7.3
3.5
Weight of phosphate
coating
X
X
4.7.5
3.6
Accelerated corrosion
resistance
X
X
4.7.4
3.7
Supplementary
treatments
X
X
4.6.2
3.8
Dimensions of
coated items
X
X
4.6.2
3.9
Surface texture
X
4.6.2
X
3.10
Workmanship
Note: The hydrogen embrittlement test shall be performed on each lot only when specified (See 6.2).
4.7.3 Weight per unit area of phophate coatings.
4.7.3.1 Type M coatings. Weight per unit area of phosphate 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 for a minimum of 15 minutes in a 50 gram per liter (g/L) chromic acid stripping solution
at approximately 74oC (165oF); rinse in clean, running water; dry and reweigh.
b. Repeat this procedure until a constant weight is obtained. The chromic acid
solution shall not be reused.
c. If a supplementary treatment is present, it shall be removed prior to testing by
immersion in a solvent such as petroleum ether. The coating weight shall be calculated as follows:
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