SITIS Archives - Topic Details
Program:  SBIR
Topic Num:  AF071-317 (AirForce)
Title:  Development of Pulse Water Strip of Tungsten Carbide HVOF Coatings and Chrome Plating on Landing Gear Components
Research & Technical Areas:  Materials/Processes

  Objective:  Demonstrate improved and environmentally friendly stripping process for HVOF tungsten carbide coatings and chrome plating on Landing Gear components utilizing pulse water strip processing.
  Description:  Landing gear components are typically chrome plated for wear and corrosion protection, and has been or is currently being replaced with HVOF tungsten carbide (WC-Co and WC-Co-Cr) coatings. Chrome plating and tungsten carbide HVOF coatings have no visual differences; hence identification of the style of finish is a concern for overhaul and rework processing. The stripping techniques for both of these processes require different methods of electro-chemical wet baths and have no affect if used for the incorrect finish (i.e. HVOF strip will not strip chrome and vice versa). In addition, these existing stripping processes have a number of processing concerns, such as environmental concerns, relief bake requirements, potential arc damage in the stripping tanks and long strip processing times. Pulse water stripping of either chrome plating or tungsten carbide HVOF coatings would eliminate the identification problem of which strip process to utilize at rework and overhaul, reduce process times, eliminate any relief bakes, eliminate the possibility of arch damage and provide an environmentally friendly process that is easily filtered for waste disposal.

  PHASE I: Demonstrate the feasibility of stripping both chrome plating and HVOF tungsten carbide (WC-Co and WC-Co-Cr) coatings on landing gear component alloys.
  
  PHASE II: Further develop, optimize and implement the approach from Phase I and demonstrate the process improvements by manufacturing multiple development & test articles designed in Phase I. Mechanical & environmental properties as well as process techniques will be optimized and validated. Landing Gear alloy qualification testing and actual part strip testing will be conducted

  DUAL USE COMMERCIALIZATION: Military application: Multiple uses for both military and commercial landing gear applications. Any aircraft currently utilizing chrome plating or HVOF tungsten carbide coatings will have applications for this approach. Commercial application: Multiple uses for both military and commercial landing gear applications. Any aircraft currently utilizing chrome plating or HVOF tungsten carbide coatings will have applications for this approach.

  References:  1. MIL-STD-871, Stripping Procedures. 2. Air Force Drawing 200310641, Coatings, Tungsten Carbide in High Strength Steel High Velocity Oxygen/Fuel Process

Keywords:  Landing Gear, chrome, HVOF, pulse water strip.

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