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8502-9
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7/17/2019 8502-9
http://slidepdf.com/reader/full/8502-9 1/23
A New Salt Measuring StripEquivalent to ISO 8502-9
Paul D. Gossen
National Surface Treatment Center
NACE International Marine Coatings Summit
October 2008
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U.S. Navy Surface Salt Testing
• Corrosion control costs US$2.4B/yr
• Potential 20 year coatings
– High solids epoxies
– Rigorous QA/QC
• Surface salt testing before painting
– All critical surfaces: tanks, underwater hull, landing areas
– 5 readings per 100 m2
– Non-immersed areas < 50 mg/m2
– Immersed areas < 30 mg/m2
• 100,000 salt tests/yr
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ISO 8502-9 Test
• Slow: 15 minute / test• Not accurate
• Frequent failures
Water under seals
Extraction Area
deformed
Leaks
Foam stuck to steel
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Salt Test Wish List
Analytical • 10% at 50 mg/m2
• Detection limit below 20 mg/m2
• Insensitive to operator technique
• No cross contamination
Field Utility • Fast - don’t delay coating application
• Reliable
• Compact, rugged, safe
• Test flat or curved surfaces
• No residue
• Auditable result
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Field Conductivity Analyzer
• Blood Glucose Meter – High stakes analysis
– Low operator training
• Disposable strip – Holds sample
– Integrated sensor electrodes
– No contamination
• Compact field reader
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Batch vs. Flow Extraction
• Batch Extraction – Bath
– ISO 8502-9 Patch
• Flow Extraction – Shower
– Water jetting
< 85% salt extracted3.0 mL H2O
> 99% salt extracted0.6 mL H2O
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• Pregnancy Test Strip – Robust
– Reliable
• Engineered fibermembranes – Fluid contained
– Flow metered
– Volume controlled
Precision fluid management
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New Concept for Salt Testing
Deionized
Water
SUBSTRATE
Engineered fiber component #1• Flow extraction of salt• Define area (A)
Engineered fiber component #2• Absorb extract• Control total volume (V): Wash steel 2X to 20X
Onboard ConductivitySensor Electrodes
Water Flow
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Salt ExtractionPad
ExtractSolution
Reservoir
Conductivity SensorElectrodes
Salt Extraction Strip
Patents Pending
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Salt Strip Performance on Steel
Design Performance
• at 50 mg/m2, 7%
• at 20 mg/m2, 13%
0
50
100
150
0 50 100 150
ISO 8502-9 [mg/m^2]
S a l t S t r i p [ m
g / m ^ 2 ]
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Strip Work Flow
1. Unwrap Package 0:05
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Strip Work Flow
2. Assemble Strip 0:13
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Strip Work Flow
3. Tack onto surface 0:15
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Strip Extracting Salt
Adhesive compression strip
Defined extraction pad area
compressed against steel
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Strip Work Flow
4. Extract Salt into Reservoir 1:15
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Strip Work Flow
4. Extract Salt into Reservoir 2:15
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Strip Work Flow
4. Test Done 3:15
Fluorescent“test done”
indicator
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Strip Work Flow
5. Remove Strip from Steel 3:15
Salt extraction area
Extracted sample &conductivity electrodes
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Strip Work Flow
6. Insert Strip into Reader 3:20
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7. Read & Save Result3:25
• Strip reader adapter – Fits off-the-shelf meters
– Replaces standardconductivity probe
– Temperature compensated
• Calibrate with drycalibration strip – No calibration fluids
3:25
Strip Work Flow
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Cycle Time – 400 m2 Tank
ISO 8502-9
• 15 minutes / test
• 20 tests in 4 hours
Salt Sensor Strip
• 4 minutes / test
• 20 tests in 12 minutes
• Labor savings – US$ 285 / tank (400 m2)
– US$ 30,000 / Navy CVN overhaul
• Paint cycle time = dry dock time
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Salt Strip Field Utility
• Fast
• Accurate – Minimum training
– Insensitive to technique
– Re-wet strip to audit results
• Robust – Any substrate curvature or
orientation
– No leaks
– 30 min. hold time afterextraction until analysis
• Safe, Clean, Easy – Compact
– No needles, bottles,solvents, calibrationsolutions
– No residue on steel• Cost Effective
– Cost approx ISO 8502-9Patch
– 20X faster
– Adapter for off-the-shelfconductivity meters
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Interested in Testing?
• Production started• U.S. Navy field testing underway
• Strips available for qualification testing
• Adapters for conductivity meters
– Jenway Model 4150
– Jenco Model 3150
• email: [email protected]