MIL-STD-1500C
5. DETAILED REQUIREMENTS
5.1 Prior to Plating. Prior to plating, all machining, forming, welding, and shot peening shall be completed.
5.1.1 Baking. Parts shall be baked for stress relief before plating for four hours minimum at 190 ± 14'C (375 ± 25'F). Shot peening when required shall be performed before plating and after stress relieving.
5.1.2 Storage of Parts. Storage of parts between stress relief and cleaning shall be controlled to prevent contact with water or other corrosive materials. Parts should be stored to permit free circulation of air around the parts.
5.1.3 Handling of Parts. After parts have been cleaned, they shall be handled in such a manner, white gloves, etc, that will assure a minimum of contamination.
5.1.4 Masking. Sections or areas of a part that are not to be plated shall be masked off. Plug and masking materials, which do not contaminate the plating bath shall be used. Masking should be performed at the most convenient step prior to plating.
5.1.5 Racking. Sufficient contact area and pressure shall be provided to carry the current without overheating. Racking should be performed at the most convenient step prior to plating.
5.1.6 Plating Sequence. If chromium and cadmium are used in combination, the chromium shall be deposited first. When chrome plating is to be followed by cadmium plating the 23 hour minimum bake period following chrome can be replaced by a four hour bake period at 190 ± 14'C (375 ± 25'F) provided the part is baked for 23 hours minimum after completion of the cadmium-titanium plating.
5.2 Plating Procedures. The cadmium-titanium plating procedure shall be performed as follows:
5.2.1 Step Number 1. Parts shall be degreased as necessary. No minimum elapsed time requirement shall apply between this operation and the cleaning operation of 5.2.2.
WARNING
PROVIDE ADEQUATE VENTILATION DURING DEGREASING OPERATIONS.
AVOID SKIN AND EYE CONTACT WITH SOLVENT SOLUTIONS.
5.2.2 Step Number 2. All parts shall be cleaned by dry blasting using 80 - 320 grit aluminum oxides (AI203), silicon dioxide (Si03), or garnet per MIL-STD-1504. Elapsed time between completion of cleaning and Step Number 3 shall not exceed 60 minutes.
5.2.3 Step Number 3. Rinse parts in cold water (0ptional). A cyanide holding tank can be used to hold parts if the plating tank is full.
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