MIL-STD-1501F
in AMS-QQ-C-320 and this standard.
5.3.1 Penetrant inspection. The parts shall be cleaned and inspected for the requirements of paragraphs 4.9, 4.10, 4.11 and 4.13 in accordance with ASTM-E1417, Type I, Method A, B, and C using materials per SAE-AMS-2644 Group VI. Penetrant penetration time will be 20 minutes minimum.
5.3.2 Magnetic particle inspection. When specified, parts shall be cleaned and inspected per ASTM-E1444, for any deleterious processing effects on the part. The acceptance standard should be as required by responsible engineering organization.
5.4 Process Controls. Solutions used in the plating process shall be checked periodically and maintained in accordance with the requirements of this process standard
5.5 Qualification Embrittlement Test. The vendor shall demonstrate his ability to provide chromium plate, which meets the requirements of para.4.6 as follows:
a. Four round notched 4340 steel specimens per ASTM F 519, Type
1a.1 or 1a.2 shall be prepared.
b. The specimens shall be prepared for plating and plated in accordance
with all of the requirements of this specification. During plating the specimens shall be mounted symmetrically on a rack by themselves. All areas of the rack except the contact area shall be coated with a suitable maskant. An ammeter, having a sensitivity of 0.5 amperes or better shall be connected in the plating circuit near the specimens being plated. The ammeter shall either be built into the rectifier being used or shall be inserted between the rectifier and the cathode. The specimen shall be plated at two amperes per square inch for three hours. The specimen shall be baked for twenty-three hours at 191 ± 14°C (375 ± 25°F) within four hours of removal from the bath.
c. The specimens will be subjected to 200 hours of static loading at 75
percent of the ultimate notched tensile strength. The test shall be considered passed if all four specimens meet the requirements of paragraph 4.6.
d. Upon successful completion of the static load test, one of the notched tensile specimens shall be sectioned across the notch parallel to the axis of the specimen. Photomicrographs shall be taken of the notched area and examined for complete coverage of the notch (use 80 - 100X magnification).
5.6 Process control embrittlement acceptance test. The process control embrittlement acceptance test shall be as follows:
a. Two standard specimens of the type noted in paragraph 5.5.a shall be
plated per paragraph 5.5.b in conjunction with the plating of items. The specimens shall be subjected to a sustained load test of 75 percent of the ultimate notch tensile strength
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