Title:
 COATING, OXIDE, BLACK, FOR FERROUS METALS
Number:
 MIL-C-13924
Revision:
 C
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, 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. Black coatings are included in this specification with limitations as noted.
   
Classification:
  
Classes
Black oxide coatings covered by this specification shall be of the following classes as specified.
   
Details Description Can Do
Class 1 Alkaline oxidizing process (for wrought iron, cast and malleable irons, plain carbon, and low alloy steels) Yes
Class 3 Fused salts oxidizing process (for corrosion resistant steel alloys which are tempered at 900F or higher No
Class 4 Alkaline oxidizing process (for 300 series corrosion resistant steel alloy only) Yes
 
Status:
 Active