NPFC - MIL-C-13924
COATING, OXIDE, BLACK, FOR FERROUS METALS
| Organization: | NPFC |
| Publication Date: | 9 June 1980 |
| Status: | inactive |
| Page Count: | 10 |
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.
Black oxide coatings covered by this specification shall be of the following classes as specified (see 6.4).
Class 1 - Alkaline oxidizing process (for wrought iron, cast and malleable irons, plain carbon, and low alloy steels).
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 300 series corrosion resistant steel alloys only).
intended Use:
Black oxide coatings are particularly suited for moving parts that cannot tolerate the dimensional build-up of a more corrosion-resistant finish. They are not recommended on parts going into... View More
Document History
