or MIL-STD-866 are reference documents in the solicitation or contract.

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MIL-STD-867C

TABLE I

Table I may be used to etch low alloy steels (Group A)

	PROCESS	SOLUTION	TIME	TEMPERATURE	REMARKS
1.	Nitric Acid Etch	Nitric Acid 3% - 5% (by volume) in alcohol Nitric Acid 3% - 5% (by volume) in water	15 - 60 seconds 5 - 15 seconds	Ambient	Agitate parts when immersed. Exact time may vary to produce desired black oxide film.
2.	Rinse	Circulating water	Rinse only	Ambient	To remove acid. Total immersion required.
3.	Hydrochloric Acid Dip	Hydrochloric Acid 4% - 6% (by volume) in alcohol or water Hydrochloric Acid 1% - 3% (by volume) in alcohol	30 - 60 seconds 5 - 15 seconds	Ambient Ambient	Agitate parts when immersed to remove black oxide film and provide uniform brownish grey surface.
4.	Rinse	Running water	Rinse only	Ambient	Agitate parts when immersed.
5.	Neutralize	Any alkali solution with pH of 10 minimum	15 seconds minimum	16 - 82 °C (60 - 180°F)	Agitate parts when immersed.
6.	Rinse	Circulating water	Rinse only	Ambient	To remove caustic.
*7.	Rinse	Alcohol	Rinse only	Ambient	To remove water.
8.	Inspect and evaluate per appropriate criteria.
**9.	Oil	Rust preventative oil		Ambient	To prevent corrosion
* Operational procedure: Hot water rinse (66°C minimum {150°F}), followed by a dry air blast may be used in lieu of this rinse. If a hot water rinse is used in lieu of the alcohol rinse, the rinse in Step 6 may be omitted.
Pre-cleaning, water rinse and Steps 1 thru 8 shall be one continuous operation.
** Apply the oil after the required embrittlement relief bake. This step may be omitted if the facility can show evidence that corrosion during the queue between process steps is not an issue. This could be the case in a low humidity environment.
Maintain all rinses at less than or equal to 350 ppm dissolved solids.