Black Oxide Steel & Stainless Steel Coatings

Black Oxide on wrought iron, cast/malleable iron, low carbon alloy STEEL. 300-Series, 400-Series, and 17-4 PH STAINLESS STEELS.

Black oxide is a conversion coating formed by the chemical reaction with the iron in a metal to form an protective surface. Oxidizing salts react with the iron to form magnetite (Fe304), the black oxide of iron. It must be impregnated with oil or wax.


  • No buildup.
  • Mild corrosion resistance
  • Improved appearance

A uniform black coating for ferrous metals that is used primarily as a decorative finish; only limited corrosion protection under mild corrosive conditions. Black Oxide coatings should be given a supplementary treatment; (ie. displacement per MIL-C-16773 Grade-3, or protective treatments per MIL-C-16173). For moving parts which cannot tolerate dimensional or physical change; can be used to reduce reflected light.

 Specifications(Military, Federal, and ASTM)

Specifications for Steel

Substrate : wrought iron, cast/malleable iron, low carbon alloy steel
Tank : 1000 gallon tank
Barrels : 42 X 22 barrels
Racks : 52 X 36 racks
Post-Treatments : 

  • oil or plain
  • Jon-Cote wax
  • Enthone wax
  • Black wax

Specifications(Military, Federal, and ASTM) : MIL-C-13924C, Class 1

Specifications for Copper, Brass, BeCu, Phos Bz

Substrate(Cu) : Copper, Brass, BeCu, Phosphor Bronze
Tank(Cu) : 200 gallon tank
Barrels(Cu) : 10 X 18 barrels
Racks(Cu) : 24 X 24 racks
Specifications(Military, Federal, and ASTM)(Cu) : MIL-F-495

Specifications for Stainless Steel

Substrate(SS) : 300-Series, 400-Series, and 17-4 PH stainless steel
Tank(SS) : 500 gallon tank
Barrels(SS) : 42 X 22 barrels
Racks(SS) : 52 X 36 racks
Post-Treatment(SS) :

  • oil or plain
  • Jon-Cote wax
  • Enthone wax
  • Black wax

Specifications(Military, Federal, and ASTM)(SS) : MIL-C-13924C, Class 4

Quality Assurance

Quality Assurance-Standard Services & Practices

MIL-Q-9858a functions and services provided on request at a fee.

Quality Control maintains all measuring & testing devices on formal calibration program according to Mil-Std-45662 with certifiable traceability to N.I.ST. 

Customers may request Certificates of Compliance to any published specification or standard; this, at a nominal fee to defray clerical expenses. 

Performance and functionality testing will be performed by independent laboratories at the customer's expense. 


  • 500 salt spray test
  • steam-age test
  • humidity testing

Coating Thickness

  • x-ray fluorescence
  • betaray backscatter
  • coulometric
  • microsectioning
  • eddy-current


  • alkaline polysulfife
  • electrolytic gel

Industries Served : 

  • Military
  • Automotive
  • Electronic
  • Telecommunications

Specifications(Military, Federal, and ASTM) : 

  • Black Oxide Coating: MIL-C-13924c
  • Chemical Finish: MIL-F-495e
  • Copper: MIL-C-14550b
  • Electroless Nickel: MIL-C-26074e
  • Gold: MIL-G-45204c (A: 90khn, B: 91-129, C: 130-200, D: 201+)
  • Nickel: QQ-N-290a (Bright, Sulfamate, Black, Strike)
  • Phosphate: light TT-C490c
  • Phosphate: heavy DOD-16232-f
  • Silver: QQ-S-365d (Type I, Type II, Type III)
  • Tin: MIL-T-10727c (Type I, Type II)
  • Tin-Lead: MIL-P-81728c (90:10%, 60:40%, 10:90%)
  • Zinc: ASTM B633 (Type I, Type II, Type III, Type IV)
  • Black Chrome: MIL-C-14538c
  • Cadmium: QQ-P-416e (Type I, Type II, Type III)
  • Chemical Films: MIL-C-5541e
  • Chemical Finish: MIL-495e
  • Chrome: QQ-C-320b (Class 1, Class 2, Class 2a-e)
  • Chromic Anodize: MIL-A-8625e
  • Dow Process: MIL-M-3171c (No. 1, No. 7, No. 9)
  • Hard Anodize: MIL-A-8625e
  • Lubricant (solid film): MIL-L-8937d
  • Passivate: QQ-P-35c (Type II, Type VI, Type VII, Type VIII)
  • Palladium: MIL-P-45209 (100% Pd, 70:30 PdNi, 50:50 PdNi, 30:70 PdNi)
  • Rhodium: MIL-R-46085 (Type I, Type II)