The porosity of phosphate coatings allows the additional materials such as paint and dry film lubricants to seep into the phosphate coating and become mechanically interlocked after drying. The dielectric nature will electrically isolate anodic and cathodic areas on the surface of the part, minimizing under-film corrosion that sometimes occurs at the interface of the paint/coating and the substrate.
The application of phosphate coatings makes use of phosphoric acid and takes advantage of the low solubility of phosphates in medium or high pH solutions. Iron, zinc or manganese phosphate salts are dissolved in a solution of phosphoric acid. When steel or iron parts are placed in the phosphoric acid, a classic acid and metal reaction takes place which locally depletes the hydronium ions, raising the pH, and causing the dissolved salt to fall out of solution and be precipitated on the surface. The acid and metal reaction also creates iron phosphate locally which may also be deposited.

Specification Specification Description Company
HP 4-7 Phosphate Boeing
AMS 2480 Phosphate General Electric
AMS 2481 Phosphate General Electric
Mil-Dtl-16232 Phosphate General Electric
AMS 2481 Phosphate Honeywell
DOD-P-16232 Phosphate Honeywell
Mil-Dtl-16232 Phosphate Honeywell
TT-C-490 Phosphate Honeywell
Mil-Dtl-16232 Phosphate Sikorsky
SS 8416 Phosphate Sikorsky
AMS 2480 Phosphate UTC Aerospace Systems
AMS 2481 Phosphate UTC Aerospace Systems
CP14.08-01 Phosphate UTC Aerospace Systems
DOD-P-16232, TYPE M, Z Phosphate UTC Aerospace Systems
MIL-P-16232, TYPE M, Z Phosphate UTC Aerospace Systems
PN14.08-01 Phosphate UTC Aerospace Systems
TT-C-490 Phosphate UTC Aerospace Systems
MIL-DTL-16232, TYPE M, Z Phosphate Various
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