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

TABLE III Process Solutions

Stripping

Solution           Section            Processing Solution                Immersion         Electrolytic

1                  5.6.1                 Cyanide - Caustic                                                    x

2                  5.6.2                Nitric Acid                                       x

3                  5.6.3                Ammonium Nitrate                         x

4                  5.6.4                Hydrochloric Acid                           x

5                  5.6.5                Hydroxide - Carbonate                                              x

6                  5.6.6                Sodium Hydroxide                                                     x

7                  5.6.7                Sulfuric Acid                                                               x

8                  5.6.8                Acetic Acid-Hydrogen                     x

Peroxide

9                  5.6.9                Sulfuric - Nitric Acid                       x

10                5.6.10              Chromic Acid                                  x

11                5.6.11              Caustic - Cyanide                          x

12                5.6.12              Chromic - Phosphoric Acid            x

13                5.6.13              Chromic - Sulfuric                          x

14                5.6.14              Multi-deposit Strip                          x

15                5.6.15              Chrome Strip from Aluminum                                    x

The above stripping solutions are referenced in the Table I and II.  Refer to the listed sections for information on solution make-up, control limits, and process notes. Proprietary formulations are available for several of these processes.  One example is a non-cyanide formulation to replace the cyanide based Multi-Deposit Strip, Solution 14. Proprietary formulations may be used provided the necessary precautions are taken to avoid substrate attack and hydrogen embrittlement.  If a proprietary formulation is used, testing must be accomplished to determine whether an embrittlement relief bake is required (Reference 4.5.1).

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