MIL-STD-1500C
e. If conventional ball anodes are used, carriers may be made of either titanium or stainless steel. Cadmium bar anodes may be used if they are cast with no central steel spline and titanium or stainless steel hooks are used. Auxiliary or internal anodes must be of cadmium or 300 series stainless steel.
f. This process requires a continuously filtered bath. The filter must be of a type that permits introduction of the titanium paste mixture on the filter cloth. The filter must have a plate area of 0.98 to 2.45 square meters per kiloliter (40 to 100 square feet per 1,000 gallons) of plating solution. The filtration equipment must be 300 series stainless steel or have an approved type of lining such as rigid polyvinylchloride or other un-plasticized material. The filter cloth material should be of a high grade chemical resistant fabric. Cotton cannot be used in this system.
g. A blast cabinet shall be located near the plating line. The size of the cabinet shall be adequate to enclose the parts to be plated. Air lines shall be suitably trapped and filtered to prevent in-process contamination of the parts to be cleaned.
h. An oven capable of baking part at 190 ± 14'C (375 ± 25'F) shall be located near the plating line. The size of the oven shall be adequate to enclose parts to be plated. The oven shall be equipped with temperature indicating, recording and regulating devices.
4.2 Specification SAE-AMS-QQ-P-416. The requirements of SAE-AMS-QQ-P-
416 shall be complied with on all parts, in conjunction with those specified in this standard. If there is a conflict between the two documents, the requirements of this standard shall govern.
4.3 Finish. The plated parts will have a finish that is smooth, continuous, homogeneous adherent and free from pits, blisters, nodules and any other indications of harmful defects. The appearance of a properly applied deposit may vary from a dull
gray to a frosty white. A bright, shiny deposit indicates malfunction of the process, which may produce embrittled parts (see: MIL-S-5002)
4.4 Corrosion. The test panel shall show no corrosion on the base metal after
500 hours exposure to salt spray per ASTM B117. Corrosion at the edges of the panel shall not constitute failure.
4.5 Titanium Content of Plating. The titanium content of the plate shall be between 0.07 and 0.5 percent titanium.
4.6 Embrittlement. Qualification test specimens and process control test specimens shall be subjected to a sustained load test at 75 percent of the ultimate notched tensile strength. The specimens shall endure this sustained load for 200 hours minimum without failing or cracking. If hydrogen detection instrument testing is used for process control, the test must meet the requirements of the instrument manufacturer.
4.7 Reprocessing. Parts rejected for defective plating, requiring stripping and re-plating, shall include all of the pre-plating steps of this standard. Parts shall be stripped in accordance with MIL-STD-871.
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