MIL-DTL-13924 Revision E:2018

This specification covers black oxide coatings applied to ferrous metals (carbon, low alloy, and corrosion resistant steels, and wrought iron).

This specification covers inorganic black coatings applied to ferrous metals (carbon,
low alloy, and corrosion resistant steels, and wrought iron). Inorganic black conversion coatings,
with or without a supplementary preservative treatment (see 3.11), may be used where a black
surface is required. Only limited corrosion protection, under mildly corrosive conditions, is
obtained as a result of black conversion coating (see 6.1). Black coatings are included in this
specification with limitations as noted in 1.2. Unless contraindicated by contract, chrome-free
finishes should be used in place of finishes containing hexavalent chromium, provided all
performance criteria herein has been met and documented as Objective Quality Evidence (OQE).