NOT MEASUREMENT
SENSITIVE
MIL-DTL-13924D
18 March 1999
SUPERSEDING
MIL-C-13924C
9 June l980
DETAIL SPECIFICATION
COATING, OXIDE, BLACK, FOR FERROUS METALS
This specification is approved for use by all Departments
and Agencies of the Department of Defense.
1.
SCOPE
1.1 Scope. This specification covers black oxide coatings applied to ferrous
metals (wrought iron, carbon, low alloy, and corrosion resistant steels). Black
oxide coatings, with or without a supplementary preservative treatment (see 3.11),
may be used where a black surface is required. Only very limited corrosion
protection, under mildly corrosive conditions, is obtained as a result of black
oxide coating (see 6.1). Black coatings are included in this specification with
limitations as noted in 1.2.
1.2 Classification. Black oxide coatings covered by this specification should be
of the following classes as specified (see 6.2 and 6.3.2).
Class 1
Alkaline oxidizing process (for wrought iron, cast and malleable
irons, plain carbon, and low alloy steels).
Class 2
Alkaline chromate oxidizing process (for use on certain corrosion
resistant steel alloys which are tempered at less than 900°F (482°C)).
Class 3
Fused salt oxidizing process (for corrosion resistant steel alloys
which are tempered at 900°F (482°C) or higher).
Class 4
Alkaline oxidizing process (for other corrosion resistant steel
alloys).
Beneficial comments (recommendations, additions, deletions) and any pertinent data
which may be of use in improving this document should be addressed to: Director,
U.S. Army Research Laboratory, Weapons and Materials Research Directorate,
ATTN: AMSRL-WM-M, Aberdeen Proving Ground, MD 21005-5069 by using the
Standardization Document Improvement Proposal (DD Form 1426) appearing at the end
of this document or by letter.
AMSC N/A
AREA MFFP
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