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

5.6.12   Solution 12: Chromic - Phosphoric Acid

Initial Makeup               Control

Chromic Acid                                         22 g/L                       15 - 30 g/L

(3 oz/gal)                     (2 - 4 oz/gal)

Phosphoric Acid                                    45 g/L                       39 - 60 g/L (5 oz/gal)                     (4 - 8 oz/gal)

Dissolved Metal                                                                     30 g/L max

(4 oz/gal max)

Temperature                                       82°C to boiling

(180°F to boiling) Procedure                                            Immersion

5.6.13   Solution 13: Chromic - Sulfuric Acid

Initial Makeup               Control

Chromic Acid                                         22 g/L                       15 - 30 g/L (3 oz/gal)                    (2 - 4 oz/gal)

Sulfuric Acid                                        45 g/L                          30 - 60 g/L (6 oz/gal)                    (4 - 8 oz/gal)

Dissolved Metal                                                                      15 g/l max

(2 oz/gal max)

Temperature                68° - 77°C (150° to 170°F)

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