Coating Applications
in the NZDF
DTA - Symposium
DNB Mar 2015
Brent Martin – Scientist Applied Chemistry
Specialist Coatings Applications
• Extend platform
capabilities
• Extend platform life
• Reduce energy usage
• Reduce maintenance
costs
• Protect personnel
Coatings Research
• Product evaluation
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Commercial products
Verifying claims
Understanding mechanisms of action
• Collaboration
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NZ CRIs & Universities
TTCP (UK, US, AS, CA & NZ)
Technology watch
Extend Capability
Extend Capability - Icephobic Coatings
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PCM Marine Icephobic Coating
Supplied via TTCP agreement
Developed by US NSWC Carderock
Clear coat silicon epoxy
Icephobic Coatings Research
2 Modes of action:
1. Hydrophobicity
- water beads off
2. Silicon nanoparticles
- expand and contract as
temperature changes
- reduce ice adhesion
strength
DTA Lab based trials
inconclusive
Feb 2011 HMNZS WELLINGTON
Feb 2011 HMNZS WELLINGTON
HMNZS OTAGO Dec 2013 Deployment
= Icephobic Coated Area
HMNZS OTAGO Jan 2014 Deployment
= Icephobic Coated Area
Handrail
Coated
Hydrant not
Coated
HMNZS OTAGO Jan 2014 Deployment
= Icephobic Coated Area
Future Work
• Expand evaluation to 5
commercially available
products
Image courtesy of T. Huber (Defence Research & Development Canada
Image courtesy of Z. Engineer & G. Willmott (University of Auckland)
•
Evaluate durability
(accelerated and natural
weathering)
•
Ice adhesion after
weathering
• Understand Ice Formation
•
High speed imagery
•
Droplet formation & freezing
Reduce Energy Usage
Low Solar Absorbing (LSA) Pigments
• Developed
1990’s
• RNZN use in
2000’s
• Reduce thermal
burden on ship
• Decreased use
of air
conditioning
Reduce Maintenance Costs
Colour change
becomes apparent
to human eye
Delta E = sum of original colour values – sum of current colour values
Colour Change = Pigment degradation
Reduce Maintenance – Polysiloxanes
• Polysiloxanes offer
improved durability
• Reduced health
hazards
• Adopted by RNZN in
Feb 2015
• Cost 30% more
• Increase topcoat life
by 66% or more
Graph courtesy of C. Lyons (Defence Science & Technology Organisation, Australia)
Extend Platform Life
Corrosion Examples
Light Surface Corrosion
Exfoliation Corrosion
Cross section
20
Corrosion Prevention
• Aging fleet requires corrosion
protection
• Chromate coatings ‘gold
standard’
• OEM requirements for new
EU sourced aircraft low or no
chromate
• Performance vs. health and
environmental concerns
GM9540P Results Bare 2024
2160 hours
(90) days
Control
B
A
C
Protect Personnel
High Strain Rate Polymers
High Strain Rate Polymers
• Thick Elastomeric Coatings
• Polyureas – nanoparticle
modification
• Provide protection from blast
shockwaves
• Contain Fragmentation
• Protect fuel tanks and batteries
Questions