Accession Number:

ADA422443

Title:

Replacement of Chromium Electroplating on C-2, E-2, P-3 and C-130 Propeller Hub Components Using HVOF Thermal Spray Coatings

Descriptive Note:

Final rept.

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

2004-03-31

Pagination or Media Count:

104.0

Abstract:

Hard chromium electroplating is extensively used by aircraft manufacturers and military maintenance depots to provide wear andor corrosion resistance or to restore dimensional tolerance to components. However, chrome plating utilizes hexavalent chromium, winch is a highly toxic carcinogen, and increasingly stringent environmental and worker-safety regulations are making chrome plating more expensive for the DoD. This document constitutes the final report on a project to qualify high-velocity oxygen-fuel HVOF thermal spray coatings as a replacement for hard chrome plating on propeller hub components from various military aircraft. Extensive fatigue, wear, and corrosion test results comparing HVOF WCl7Co, WClOCo4Cr, and Tribaloy 800 coatings against hard chrome are presented. In general, the performance of the HvOF coatings was superior to hard chrome. A rig test on a P-3 low-pitch-stop lever sleeve coated with WCl7Co showed acceptable performance. A costbenefit analysis conducted for a military repair depot that overhauls propeller hub components showed a slight cost increase associated with use of the HVOF coatings.

Subject Categories:

  • Aircraft
  • Economics and Cost Analysis
  • Metallurgy and Metallography
  • Logistics, Military Facilities and Supplies

Distribution Statement:

APPROVED FOR PUBLIC RELEASE