MIL-DTL-14538D
Plated springs and other parts subject to flexure shall not be flexed prior to the embrittlement relief
treatment.
3.4.2 Test to determine adequacy of hydrogen embrittlement relief treatment. Unless otherwise
specified (see 6.2), the adequacy of the hydrogen embrittlement relief treatment shall be determined by
applying the test in 4.6.
3.5 Finish.
3.5.1 Uniformity. The black chromium finish shall be applied to the basis metal in such a manner
as to be smooth and fine grained. It shall completely and uniformly cover all surfaces to be plated.
3.5.2 Luster. The finish shall be uniformly "dull" and without luster. Examination under controlled
light shall show no "bright" spots due to wax, oil, or other causes.
3.5.3 Color. Unless otherwise specified (see 6.2), the color of the deposit shall be a dark gray
approaching black. It shall approximate color plate 37038 of FED-STD-595. When a color sample is
provided by the procuring agency it shall be matched for color. Solutions shall be so regulated and
controlled as to give a smooth and uniform color as specified on all plated surfaces on the same order or
contract (see 6.6).
3.5.4 Corrosion resistance. After exposure to the salt spray fog for four hours as specified in
paragraph 4.4.1, the specimens shall show no basis metal corrosion products when examined at normal
reading distance. The presence of black streaks or stains shall not be cause for rejection.
3.6 Workmanship. The workmanship shall be of a quality to accomplish a thoroughly clean and
contaminant free metal surface prior to the application of the black chromium finish together with a
uniform and clean finish of the applied coating. Any evidence on the surface of discoloration, mottled
effect, rainbowing, inadequate coverage, powdery deposits, blisters, pits, nodules or indications of
burning shall be considered as defective workmanship.
4. VERIFICATION
4.1 Responsibility for inspection. Unless otherwise specified in the contract, the contractor is
responsible for the performance of all inspection requirements (examinations and tests) as specified
herein. Except as otherwise specified in the contract, the contractor may use his own or any other
facilities suitable for the performance of the inspection requirements specified herein, unless disapproved
by the Government. The Government reserves the right to perform any of the inspections set forth in
this specification where such inspections are deemed necessary to ensure supplies and services conform
to prescribed requirements.
4.2 Lot. Unless otherwise specified (see 6.2), a lot shall consist of plated articles of the same
material and condition, and of approximately the same size and shape, plated under similar conditions
and submitted for inspection at the same time.
4.3 Sampling.
4.3.1 Sampling for inspection. The number of random samples selected for nondestructive tests
from each inspection lot shall be determined by the procuring activity (see 6.2). For destructive tests a
random sample of four items shall be selected from each inspection lot, or four separate specimens shall
be prepared in accordance with 4.3.2 to represent each inspection lot. If the number of items in an
inspection lot is four or less, the number of items in the sample shall be determined by the procuring
activity (see 6.2). Defects shall consist of deviations from the requirements specified in paragraphs 3.5
and 3.6.
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