FPC: fluoro-phosphate conversion (titanium)

Fluoro-phosphate conversion is a chemical conversion process applicable to titanium alloys and producing a complex film of phosphate and fluoride.

Description of the process

The purpose of this chemical conversion is to confer on the treated part a decrease in its friction coefficient and to prevent seizing:

  • Appearance: depending on the alloy, the colour is more or less dark, ranging from metallic grey to more amber colours
  • Thickness: < 1 µm
  • Surface condition: slight degradation of the roughness
  • Coefficient of friction: depends on the load applied - the higher the load, the lower the coefficient, in the order of 0.1 under 1 N (opposing Titanium T40)
  • Reduction in fatigue: little data available on this point


All grades of alloy (TA6V  T40, etc.) for all modes of processing. However, the alloy greatly influences the level of performance obtained and the appearance.


Nuts and bolts, fastenings, unions, etc.

Sectors concerned: Aeronautical, fastenings, etc.

Environmental impact

This process is not affected by ELV, RoHS or REACH regulations.

Reference systems

  • AMS 2486: fluoro-phosphate conversion of titanium alloys