Advanced Erosion Resistance Coating System Program AMSC83231 and AMSC83445

1
Advanced Erosion Resistance Coating System
ProgramAMS-C-83231 and AMS-C-83445

• Lt Grant Parker
• AFRL/MLSSO
• Materials and Manufacturing Directorate
• Air Force Research Laboratory

2
Overview

• Background
• Coating Stackup
• Search for a Qualified Product
• Wet Test Results
• Dry Test Results
• Weathering Results
• Erosion Resistant Results
• Follow On Work

3
Background

• Damaged Leading Edges
• Cracked Radomes
• Coating Curing Problem
• Environmental Conditions
• High Temperature
• High Humidity

4
Coating Stackup

• Rain Erosion Resistant Coating, AMS-C-83231

Antistatic Topcoat
Rain erosion
Rain erosion
Primer
Primer
Substrate
Substrate (Fiberglass, Aluminum, etc.)

• Thermal Reflective Erosion Resistant Coating,
  AMS-C-83445

Mil-PRF-85285
White Rain Erosion
White Rain Erosion
Real World Stack Up
Primer
Primer
Substrate
Substrate
5
Search for a Qualified Product

• CAAP Co removed from qualified product lists
• Decided not to requalify
• Used as control during testing
• Hontek Corp. submitted new coatings
• Full qualification testing to both specs
• Conducted at CTIO
• Wet paint properties testing
• Dry paint properties testing

6
Wet Tests Results

• Phase 1 Wet Tests 100 Complete
• Both products performed good on most tests
• Two notable performance differences
• Sprayability of Antistatic Coating (AMS-C-83231)
• Easier to apply Hontek coating
• CAAP Cos clogs the spray gun
• Cure rate of White Coating (AMS-C-83445)
• 4 hrs Hontek vs 2 days CAAP Co for tack free
• Requirement is an 8 hr _at_ 770F and 50 RH

7
Dry Tests Results

• Phase I - 85 Completed
• Both products performed well on most dry tests
• Two notable test failures
• Weathering of all gray erosion resistant and
  antistatic coatings (AMS-C-83231)
• Erosion resistance of all coatings
  (AMS-C-83231and AMS-C-83445)
• Hontek products provided 2-3 times better
  resistance compared to CAAP

8
Weathering

• Gray erosion resistant coatings failed
  (AMS-C-83231)
• Chalking on panels
• Color shift
• All antistatic coatings lost conductivity

Hontek Erosion Resistant
CAAP Co Antistatic
Hontek Antistatic
9
Erosion Resistance Pictures

• White Thermal Reflective Coating, AMS-C-83445

Hontek
CAAP Co
34 minutes
70 minutes
10
Erosion Resistance Pictures

• Antistatic Rain Erosion Resistant Coating,
  AMS-C-83231

Hontek
CAAP Co
33 minutes
60 minutes
11
Follow On-Work

• Update AMS specifications
• Antiquated test methods
• Perform Baseline Testing
• Revalidate rain erosion testing facility
• Add in particle erosion
• Helicopter Rotor Blades
• Evaluate new radome substrates
• Radant Technologies

12
Questions AMS-C-83231 and AMS-C-83445

• Lt Grant Parker, AFRL/MLSSO (CTIO)
• 937-656-9566
• Grant.Parker_at_wpafb.af.mil
• Lynne Pfledderer, AFRL/MLSA
• 937-255-4113
• Lynne.Pfledderer_at_wpafb.af.mil