Can the Screening Process for Fouling-Release Coatings be ... Lieberman.pdf · Dynamic Testing:...
Transcript of Can the Screening Process for Fouling-Release Coatings be ... Lieberman.pdf · Dynamic Testing:...
Can the Screening Process for Fouling-Release
Coatings be Improved to Better Predict Ship-Scale
Performance?
Kody Lieberman, Brittany Preston-Baker and Elizabeth Haslbeck
Naval Surface Warfare Center Carderock Division
Kelli Hunsucker and Geoffrey Swain
Florida Institute of Technology
Rick Foster and James Martin
Naval Research Lab Key West
19th ICMCF, 24-29 June, 2018
DISTIBUTION STATEMENT A: APPROVED FOR PUBLIC RELEASE; DISTRIBUTION IS UNLIMITED
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Fouling-Release Coatings:In-Service Performance
U.S. Navy has been evaluating fouling-release (FR) coatings on a small number
of ships for ~20 years, and has seldom observed consistent sloughing of hard
fouling.
Full scale performance not matching panel test results.
• Operational area and operational tempo
• Screening test protocol
24-29 June 2018 19th ICMCF, Melbourne FL
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MIL-PRF-24647E is a performance specification to qualify paint systems intended
for use on the underwater hulls of Navy/DoD vessels.
• Panels immersed statically and uncaged in Biscayne Bay, FL
• Tested in flow channel quarterly for 8 quarters
• Hard fouling shall occupy <40% of the surface prior to flow channel testing
• Hard fouling shall occupy <20% of the surface after flow channel testing at 20 kts
Coating Qualification:MIL-PRF-24647E
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Questions
Do we need a new test or can we update our current protocol (MIL-PRF-24647E)
to better predict full-scale performance?
• Does biofouling community composition affect FR performance?
– Predator exclusion effects?
– Location effects?
– Seasonal effects?
• How does performance of FR coatings vary across dynamic test methods?
– Flow channel (MIL-PRF-24647E)
– Through-hull (Florida Institute of Technology)
24-29 June 2018 19th ICMCF, Melbourne FL
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Technical ApproachStatic Immersion
Port Canaveral
Sebastian Inlet
Miami
Test Site Location
Treatments Acronym
Fouling-Release 1 (Qualified Coating) FR 1
Fouling-Release 2 FR 2
Fouling-Release 3 FR 3
Antifouling/Fouling-Release Hybrid AF/FR
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Flow channel test: in general accordance with ASTM D4938
• Replicate panels immersed at Miami test site
– 3 caged, 3 uncaged
• Tested quarterly for 8 quarters
• Run at 10, 20 and 30 kts for 15 min each
• Fouling community measured as percent cover (ASTM D6990)
Technical ApproachDynamic Testing: MIL-PRF-24647E Flow Channel
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Technical ApproachDynamic Testing: Through-Hull
Florida Institute of Technology Through-hull test: panel mounted in apparatus
and placed into wet well built into the aft section of a 30 foot power boat
• Replicate panels immersed at Port Canaveral and Sebastian Inlet test sites
– 3 at each site
• Tested quarterly for 2 quarters
• Run at 10 and 20 kts for 10 min each
• Fouling assessed per ASTM D6990
Wet Well
Panel Apparatus Video
Camera
Test Panel
Panel apparatus with video camera
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Does biofouling community composition affect FR performance?
Predator exclusion effects?
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Uncaged
Caged 20 kts10 kts00 kts 30 kts
Barnacle Tube Worm Encrusting Bryozoan Mollusc Slime/Bare SpaceSoft Fouling
Flow ChannelPredation Effect: FR 2 Coating
Q5
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Does biofouling community composition affect FR performance?
Location effects?
Seasonal effects?
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Through-Hull TestBetween Locations
Fa
ll -
Win
ter
Sp
rin
g
Barnacle Tube Worm Encrusting Bryozoan Mollusc Slime/Bare SpaceSoft Fouling24-29 June 2018 19th ICMCF, Melbourne FL
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Through-Hull TestRound 2 Between Locations: FR 3
Port
Canavera
lS
ebastian
00 kts 10 kts 20 kts
Spring: 3 months of biofouling growth
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Through-Hull TestBetween Seasons
Fa
ll -
Win
ter
Sp
rin
g
Barnacle Tube Worm Encrusting Bryozoan Mollusc Slime/Bare SpaceSoft Fouling24-29 June 2018 19th ICMCF, Melbourne FL
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Through-Hull TestBetween Seasons: FR 1
Fall
/ W
inte
rS
pring
00 kts 10 kts 20 kts
Port Canaveral: 3 months of biofouling growth
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What Did We Learn?
Do we need a new test or can we update our current protocol?
• Community composition impacted FR performance
Predator exclusion
Immersion location
Seasonal variation
• Dynamic test method did not impact release
When hard fouling occurred, there was limited release
Need to balance cost and risk regarding coating validation and qualification
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NRL: James Martin, Rick Foster
FIT: Kelli Hunsucker, Harrison Gardner, Hannah
Briant, Johanna Evans, Geoffrey Swain
Sponsor: Steve McElvany and Paul Armistead,
ONR Code 332
Thank you!
24-29 June 2018 19th ICMCF, Melbourne FL