Erosion Resistant Coating Qualification

1
Erosion Resistant Coating Qualification

• Lt Shawn Fontenot
• AFRL/MLSSO
• Materials and Manufacturing Directorate
• Air Force Research Laboratory

2
Overview

• Background
• Candidate Erosion Resistant Coating
• Test Approach
• Coating Stackup
• Wet Tests
• Dry Tests
• Status of Testing
• Schedule

3
Background

• White Anti Static Coating not curing or
  Reverting/Depolymerizing to uncured conditioned
• High Temperature and Humid Environment
• Question Current Erosion Resistant Coating
  Performance

4
Background (cont.)

• Currently no products qualified to AMS-C-83231
  and AMS-C-83445 specifications
• Formerly Mil-C-83231 and MIL-C-83445
• Previously only one manufacturer was qualified
  to these specifications
• Manufacturer decided not to requalify

5
Candidate Erosion Resistant Coating

• Through a SBIR effort with AFRL/MLB the Hontek
  Corporation developed a new erosion resistant
  coating
• Two coatings for AMS-C-83231 qualification
• Gray cammo rain erosion coating
• Gray antistatic rain erosion coating
• One Coating for AMS-C-83445
• Thermal reflective rain erosion coating

6
Test Approach

• Full qualification testing to both specifications
• Testing conducted at CTIO by UDRI
• ISO 17025 Accredited Lab
• Testing involves
• Wet paint testing
• Dry panel testing
• Testing after one year shelf life

7
Coating Stackup
AMS-C-83231

Rain Erosion Coating
Antistatic Coating
1-2 mils Cammo rain erosion
1-2 mils Cammo antistatic
11-12 mils Gloss rain erosion
11-12 mils Gloss rain erosion
1-2 mils Primer
1-2 mils Primer
Fiberglass
Fiberglass
8
Coating Stackup
AMS-C-83445 stackup per qualification purposes
12-14 mils White thermal flash coating
1-2 mils Primer
Fiberglass
Coating stackup up on actual aircraft
Mil-PRF-85285
12-14 mil Gray erosion coating
Test stackup
10-12 mils White thermal flash coating
1-2 mils Primer
1-2 mils Primer
Fiberglass
Fiberglass
9
Wet Tests

• Solids
• Density
• Viscosity
• Flash point
• Pot life
• Cure rate

10
Dry Tests

• Peel strength
• Flexibility
• Water and fuel resistance
• Rain erosion resistance
• Radar transmissivity
• Weather resistance
• Strippability
• Repairability
• Surface resistivity (AMS-C-83231 only)
• Thermal flash resistance (AMS-C-83445 only)

11
Status of Testing

• Test panels prepared
• Wet and dry testing ongoing
• Preliminary data
• Tack Free Time (10 hours)
• Both coatings failed
• Sprayability
• Problems spraying antistatic coating

12
Schedule

• Two year program
• Driven by one year shelf life
• Wet testing complete by July 2004
• Dry testing complete by November 2004
• Preliminary data available June-July 2004