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

5.4    Baking. Parts shall be baked for stress relief for four (4) hours minimum at

191 ± 14'C (376 ± 25'F) prior to stripping.

5.5   Procedure.

a.     Step  No.  1.  Degrease  parts  prior  to  further  processing.  Emulsion cleaning methods may be used if materials and equipment are available.

b.    Step No. 2. Mask and rack parts as necessary.

c.    Step No. 3. Strip inorganic coating in the appropriate solutions from Table  I  or  II.   Strip  parts  in  the  shortest  time  necessary  to  remove  coating.   Refer  to Table III for information on solution makeup, control limits and process notes.

d.   Step No. 4. Rinse part immediately in clean water.

e.   Step No. 5. Rinse the part in hot water to facilitate drying.

f.    Step No. 6. Bake steel parts heat treated above 1240 MPa (180,000 psi) in accordance with paragraph. 4.5.

4 and 5.

g.    Step No. 7. Inspect as necessary for the requirements of paragraphs

TABLE I

Stripping of Metal Coatings

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