MIL-STD-1501F
(3) Current density 31.0 to 62.0 amps/decimeter squared (2 to 4A per square inch) anodic.
(4) Time - 30 - 120 seconds.
5.2.4 Step No. 4. Chromium plate at 15.5 to 77.5 amps/decimeters squared (1 to 5A per square inch) to the required thickness. When feasible, apply voltage so that
the current will flow upon immersion of parts. Chromium plate in the following solutions:
a. Chromic Acid 225-270 gram/liter (30-36 ounce/gallon)
b. Sulfuric Acid 2.25-2.7 gram/liter (0.30-0.36 ounce/gallon)
c. Trivalent Chrome 4 grams per liter (g/l) maximum d. Iron 5 g/l maximum
e. Ratio Chromic Acid/Sulfuric Acid 80/1 to 120/1 f. Temperature 52 - 62°C (125 - 145°F)
g. It is general practice to start plating at a higher current (two to three
times the plating current) for a short time (approximately 0.5 to 1.0 minutes) and then reducing to the desired plating current. This helps in providing the initial layer of chromium and lessens the chance of leaving bare spots.
NOTE: Other plating solutions may be used when approved by the responsible engineering organization provided the deposit meets the requirements of this standard.
WARNING
PROVIDE ADEQUATE VENTILATION WHEN USING CHROMIC PLATING SOLUTIONS. WEAR PROTECTIVE RUBBER GLOVES AND CHEMICAL GOOGLES TO PREVENT
SKIN AND EYE EXPOSURE.
5.2.5 Step No. 5. Rinse parts in cold water and inspect for defects and adequate buildup. If undersize, return to plating tank and continue plating. If plating is adequate, remove masking, racking, and clean as necessary.
5.2.6 Step No. 6. Rinse all parts in hot water and blow dry with compressed air. Elapsed time between completion of plating and start of baking, Step No. 7, shall not exceed four hours.
5.2.7 Step No. 7. Bake all parts heat treated to 1.24 X 109 Pa (180,000 psi) and above for twenty three hours minimum, at 191 ± 14°C (375 ± 25°F) (See paragraph
5.1.3).
5.3 Inspection. Inspection shall be in accordance with the inspection and tests
8
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business