Phosphate Fluoride Coating

Phosphate fluoride coating on titanium is used to increase corrosion resistance, improve paint adhesion, and to prevent fretting and galling in metal-to-metal contact applications.

Titanium parts are wired or placed into pinch racks and attached to a bar. Only the surfaces that require coating are exposed to the processing. All other surfaces or holes are protected using plugs or liquid maskant.

The parts are then lifted by hoist and lowered into the tanks. Parts are alkaline cleaned, etched and descaled; this ensures that the parts are clean, free of foreign contaminants and ready to for the phosphate coating. Parts are then immersed into the phosphate fluoride bath.

Processed parts are inspected using a dualscope to measure coating thickness. Inspectors also visually check for corrosion, pitting or pockets in the material that could be cause for rejection. If the parts are deemed unacceptable by the inspector, parts are either written up for internal rework or returned to the customer for evaluation.

After processing and inspection, parts are moved to the next operation, typically paint or final inspection.