Chromium-Free
Primer for Threaded Fasteners
(Pratt & Whitney - United Technologies Corporation)
Project Number: J-95-MF-003
Completed in 1999
The JG-PP
has completed a successful project with P&W-UTC
to qualify chromium-free primers for providing galvanic corrosion protection
to inserts and fasteners used in aircraft engines manufactured by P&W-UTC.
Prior to the start of this joint project, P&W-UTC had been applying a
zinc chromate primer to these parts using manual dip, brush, or spray
coating processes. Exposure to hexavalent chromium, found in zinc chromate
primer, may cause serious health effects. There are stringent OSHA
and EPA
regulations that govern the use and disposal of hexavalent chromium and
hexavalent chromium-containing materials.
As a result of this project, two potential alternatives, TT-P-645B Zinc Molybdate Primer and TT-P-664D High Solids Primer were found to be acceptable replacements for zinc chromate primer.
Potential benefits of implementing alternatives include:
- Reduced chromium emissions
- Reduced waste management costs
- Reduced compliance risk
- Reduced worker exposure risk.
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