Zinc Phosphate Coatings

Zinc Phosphate for medium and low alloy, cold- & hot-rolled STEELS.

Zinc Phosphate is a corrosion resistant coating for metal surfaces. A seeding agent such as sodium pyrophospahte is used as a pre-treatment to create a crystalline structure. Provides a grey-black coating for medium- and low-alloy steels;

Type Z:

May be used up to 200°F, and prevents wear.

Supplemental coatings are added to impart moderate to medium corrosion protection.

Specifications(Military, Federal, and ASTM)


Tank : 1750 gallon tank
Barrels : 42 X 22 barrels
Racks : 52 X 36 racks
Post-Treatments : 

  • oil or plain
  • light oil
  • heavy oil
  • Edurion-oil
  • MIL-L-3150 oil
  • Soap Per Ford Spec ESB-M99C108-A
  • MIL-PRF-16173 oil

Specifications(Military, Federal, and ASTM) : DOD-16232F, Class(all)
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)
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. 

Capabilities :

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

Coating Thickness

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


  • alkaline polysulfife
  • electrolytic gel