Replacement of Chromium Electroplating on C-2, E-2, P-3 and C-130 Propeller Hub Components Using HVOF Thermal Spray Coatings
Abstract
Hard chromium electroplating is extensively used by aircraft manufacturers and military maintenance depots to provide wear and/or 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 WC/l7Co, WC/lOCo4Cr, 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 WC/l7Co showed acceptable performance. A cost/benefit analysis conducted for a military repair depot that overhauls propeller hub components showed a slight cost increase associated with use of the HVOF coatings.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 31, 2004
- Accession Number
- ADA422443
Entities
People
- Aaron Nardi
- Bruce D. Sartwell
- Keith O. Legg
- Robert Kestler
- Warren Assink
Organizations
- United States Naval Research Laboratory