Effects of WashRinse Intervals On Corrosion Early Results Of A Ground Based Study - PowerPoint PPT Presentation
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Effects of WashRinse Intervals On Corrosion Early Results Of A Ground Based Study
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Present Policy Is To Wash At Specified Intervals Based On ... Recent But Cursory Studies Suggest That This Policy Should Be Examined Further. Study Objectives ... – PowerPoint PPT presentation
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Title: Effects of WashRinse Intervals On Corrosion Early Results Of A Ground Based Study
1
Effects of Wash-Rinse Intervals On Corrosion
Early Results Of A Ground Based Study
- W.H. Abbott Battelle-Columbus
- Richard Kinzie AFCPO Warner Robins
2
Introduction
- Why Do We Presently Wash Aircraft ?
- Corrosion Control ?
- Cosmetics ?
- Present Policy Is To Wash At Specified Intervals
Based On Environmental Severity (ESI) - Recent But Cursory Studies Suggest That This
Policy Should Be Examined Further
3
Study Objectives
- Develop Quantitative Data On Effects Of
Wash-Rinse Intervals On Corrosion Rates - Study In Real Environments
- Study At Different Severity/ESI Levels
- Use Realistic Wash and Rinse Procedures
- Obtain Real-Time Corrosion Rate Data Using
Corrosion Sensor technology
4
Experimental Approach
- Utilize Metallic Corrosion Sensors As Test
Vehicle - Same Sensors As Being Flight Tested
- Mounted Vertically In Multiple, Outdoor
Environments Differing Widely In Severity - Wash And Rinse Independent Sensors At Fixed
Intervals - Wash With 5 BB Regel In Local Tap Water
- Rinse By Spray With Local Tap Water
- Air Dry Naturally
- Measure Monthly As Electrical OutputCumulative
Corrosion
5
Experimental (Contd)
- Exposure Locations ESI (percentile)
- Daytona Beach (75 meters) 95(very severe)
- Daytona Beach (1/4 mile inland) 75 (severe)
- Central Ohio (WPAFB ESI) 50 (moderate)
- Warner Robins 30 (mild)
- Wash Intervals Studied No Wash, 1,2,4,7,14,28
days - Photo Typical Samples On Fence
- 3 sets Duplicate Samples (0,1,2 days)
- ESI Test Rack (not washed)
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Worldwide ESI Distribution vs. Wash-Rinse Site
ESI
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Example Of Corrosion Kinetics Daytona 75 m.
- Data Show Consistent Progression Of Degradation
- Validation of Techniques
- Benefits Not Immediately Apparent
8
Corrosion vs. Wash Interval Daytona 75 m.
- Data Show Benefit/ Minimum Corrosion
- Increasing Benefit With Time But Lost If Extended
gt 20 days - Max Benefit _at_ 1-2 Days
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Corrosion vs. Wash Interval Daytona ¼ mi. Inland
- Benefit But Note Scale Change
- Smaller Benefit But Measurable
- Max Benefit _at_ 1-2 Days But Gone Within Extend gt 7
Days
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Corrosion vs. Wash Interval Central Ohio
- Slight and Questionable Benefit
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Corrosion vs. Wash Interval Warner Robins
- No Apparent Benefit
- Results Actually Suggest Increased Corrosion
- Reasons Not Defined
- Water Quality Issue ?
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Conclusions
- Early Results Raise Questions About Wash-Rinse
Benefits For Corrosion Control In Many
Environments - Reduced Corrosion Rates/Benefits Demonstrated
Only For Severe Environments (gt70th percentile
possibly gt90th ) - Only For Very Frequent Wash or Rinse (1-2 days)
- Effects Of Rinse Only Not Known (under study)
- Benefits May Be Lost If Wash Time Extended Beyond
Few Days - Results Must Be Confirmed On Operational Aircraft
Before Any Changes To Existing Policy Recommended - Results May Provide Basis For Relaxation Of
Wash-Rinse Requirements If Verified
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