MIL-STD-871 Electro-Chemical Stripping Of Inorganic FinishesThis standard covers the process and materials required for the stripping of inorganic finishes. Subsequent heat treating techniques needed to insure hydrogen embrittlement relief of the steel substrate are also described.

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MIL-STD-871B

Procedure                                          Immersion

5.6.14   Solution 14: Multi-deposit Strip

Initial Makeup               Control

Meta Nitro Benzene Sulfonate           60 g/L                  See paragraph 5.7 (8 oz/gal)

Sodium Hydroxide                              15 g/L                         pH: 11 - 12 (2 oz/gal)

Sodium Cyanide                                  90 g/L                        75 - 105 g/L (12 oz/gal)                (10 - 14 oz/gal)

Temperature                50° - 55°C (120° to 130°F)

Procedure                                           Immersion

5.6.15    Solution 15: Chrome Strip from Aluminum

Initial Makeup               Control

Sulfuric Acid                                       175 g/L                       150 - 200 g/L (22 oz/ gal)              (18 - 16 oz/gal)

Dissolved Metal                                                                     30 g/L max

(4 oz/gal max)

Temperature        15.6° - 26.7°C (60° - 80°F)

Procedure                                        Make anodic at 4 - 6 volts

5.7   Solution Makeup. Unless otherwise specified, the following procedure shall be used in making up solutions:

a. Fill tank approximately 1/3 to 1/2 full with water.

b. Add solid chemicals slowly and stir until dissolved.

temperature.

c. Add liquid acids slowly with mixing, and allow solution to cool to normal

d. Add other liquid chemicals.

e. Fill tank to operating level with water and mix thoroughly.

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