Black Oxide Coating
Black Oxide Coating
For moving parts which cannot tolerate the dimensional change of a more corrosion resistant finish. For decorative applications and can be used to decrease light reflection.
A uniform black coating for ferrous metals. Mostly a decorative coating with limited corrosion protection under mild corrosion conditions.
Black oxide coatings should normally be given a post supplementary oil treatment.
MIL-C-13924
Class 1
Alkaline oxidizing for wrought iron, cast and malleable irons, plain carbon and low alloy steel.
Class 2
Alkaline-chromate oxidizing used on certain corrosion resistant steel alloys tempered at less than 900 deg F.
Class 3
Fused salt oxidizing for corrosion resistant steel alloys which are tempered at 900 deg For higher.