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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5.6.4

Solution 4. Hydrochloric Acid

Hydrochloric Acid

Initial Makeup

255 g/L

Control

210 - 240 g/L

(30 oz/gal)

(28 - 32 oz/gal)

Antimony Trioxide

15 g/L

(2 oz/gal)

8 - 22 g/L (1 - 3 oz/gal)

Dissolved Metal

30 g/L max

(4 oz/gal max)

Temperature

Room

Procedure

Immersion

5.6.5

Solution 5. Hydroxide - Carbonate

Initial Makeup

Control

Sodium Hydroxide

52.0 g/L (7 oz/gal)

45 - 60 g/L (6 - 8 oz/gal)

Sodium Carbonate

68 g/L

(9 oz/gal)

60 - 75 g/L (8 - 10 oz/gal)

5.6.6

Temperature

Procedure

Solution 6. Sodium Hydroxide

Sodium Hydroxide

Room

Make part anodic at 4 - 6 volts

Initial Makeup               Control

75 g/L                            68 - 82 g/L

(10 oz/gal)                   (9 - 11 oz/gal)

Temperature

Room

Procedure

Make part anodic at 6 volts

5.6.7

Solution 7. Sulfuric Acid

Initial Makeup               Control

Sulfuric Acid

1125 g/L                      1100-1150 g/L (150 oz/gal)              (144-155 oz/gal)

Glycerin

30 g/L                           22 - 38 g/L