Coatings Technologies Specification Work Update Air Force Corrosion Managers Conference 15 March 200

1
Coatings Technologies Specification Work Update
Air Force Corrosion Managers Conference15
March 2005

• Bill Hoogsteden
• Project Engineer
• Materials Manufacturing Directorate
• Air Force Research Laboratory

2
Agenda

• APC Specification
• Wipe Solvent Specification
• PMB Specification/Engineering Qualification Plan
  (EQP)
• Chemical Remover Specification

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

3
Advanced Performance Coating System

• APC Specification going two routes
• Submitted to ASC/ENOI
• Possible Mil-Spec implementation, 3 months
• Submitted to SAE G-8 Aerospace Coating
  Subcommittee
• 14 day ballot
• Possible implementation, summer 2005
• Announce of APC specification for candidate
  submittal

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

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Wipe Solvent Specification(status)

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

• AMS 3167 Rev B 
• Undergone 2 full ballots (30 day review)
• Modifications completed
• Final 14 day ballot before publication
• Publication Summer of 2005
• Announce for candidate submittal

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PMB Chronology

• Mid 80s PMB Development
• 1988 MIL-P-85891A Written
• 1992 MIL-P-85891A Taken Over By AF
  Rewritten
• 1993-97 EQP Drafted
• 1998 MIL-P-85891A Amendment 2
• 1998 SAE MA4872 Published
• 2001 Letter Approving Type VIII
  (Nano- composite)
• 2003 Corrosion Conference PMB Side-bar
  Meeting
• Latest Draft of EQP

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

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Depaint Approval Document Relationships
?

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

?
MIL-P-85891A (Plastic Media)
Depaint EQP (Depaint Process)
?
?
T.O. 1-1-8/System 23 (Approval)
Implementation
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Original MIL-P-85891A Requirements

• Specification requirements based on limited
  1980s material and data
• Acknowledgement by MIL-P-85891A committee
  requirements may have to be revised following
  First Article experience
• Original MIL-P-85891A committee members retired
  and requirements not revised
• Not considered is the changes observed in plastic
  material processes
• No vendors qualified to Types I, IV, VI medias
• New Types of media becoming available (Type VII,
  VIII, etc.)

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

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MIL-P-85891A Changes

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

• Establish QPL
• Take out of T.O. 1-1-8
• Make the Specification into a Detail
  Specification
• MIL-DTL-85891B
• Improved test to identify dense particulates in
  media
• Sieve size analysis
• Ash Content test change
• Increase in allowable amount for Type II media

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MIL-P-85891A Changes(continued)

• Quantifiable test to discriminate between
  extruded cast acrylic
• eliminate Type V residue smear
• Quantifiable anti-static test
• Better define test nozzle
• Vacu-Blast nozzle called out in specification
• Include requirement for user spot-checking
• Remove color requirement
• Remove Extract Content requirement

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MIL-P-85891A Changes New Plastic Media Approvals

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

• Type VIII
• US Technology Magic II media

• Type VII
• ADM GPx Cornstarch Acrylic Hybrid Polymer media

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Measuring Anti-Static Behavior

• Half-charge decay time
• 'half-life' of a charge on a given specimen.
• Surface resistivity
• how poorly the polymer conducts electricity

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

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Measuring Static Charge

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

• Half-charge decay time Surface resistivity
• Quick and simple quantities to measure
• Measurements can be done on powders
• Measuring equipment relatively inexpensive
  (1K-5K)
• Are these values applicable to all the media
  types in powered form?

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Media Magnetic Test Issue

• Problem
• Media received below 0.02
• high density particle level AND
• were magnetic (iron/steel present)
• T.O. 1-1-8, Para 2-21.13.3.9
• high density particle contamination Level shall
  not exceed 0.02 for all used media
• Solution
• Plastic Bead Blast Materials Characterization
  StudyContamination Evaluation - Battelle
  Memorial Institute
• If magnetic particles are picked up AND dense
  particulates are below 0.02, - NO Problem.
• T.O. 1-1-8 to be clarified

Magnetic Separator

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

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EQP ProcessEvaluating the Dry Media removal
process
INITIAL PROCESS EVALUATION Does the media remove
AF coatings?

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

PROCESS EFFICIENCY EVALUATION What are the
optimum removal parameters?
INITIAL MATERIALS DAMAGE ASSESSMENT Does the
media and optimized process damage metals?
FULL MATERIALS CHARACTERIZATION PROGRAM Does the
media and optimized process damage composites or
cause corrosion?
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EQP Changes

• Format changes
• Common section
• Tests relating to all removal process types
• Cut down the number of coatings to test
• Specific test section for each process type
• Chemical, mechanical, photonic (e.g. Laser)
• Addendum
• Optional tests, coatings, etc.
• Located on AFCPCO web site (https//afcpco.Robins.
  Af.Mil)
• Investigating to make it a Process Specification

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

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Dry Media Blast Approval Process
EQP (Process)

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

Phase 1
Phase 2
MIL-P-85891A Specification (Media)
Phase 3
Phase 4
T.O. 1-1-8
System -23s
Implementation
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Chemical Remover Chronology

• Methylene chloride
• Environmental concerns/NESHAPS
• Environmentally friendly chemical paint
  removers
• OC-ALC chemical paint remover purchase
  description
• WR-ALC chemical paint remover purchase
  description
• Peroxide-based dual single component removers
• CTIO effort to reconcile purchase descriptions
  (Jan 04)

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

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Chemical Remover Team Recommendations

• Environmentally acceptable chemical paint remover
  military specification preferred
• SAE G-8 approached as a backup
• Combined draft specification being written
• 2 Types
• Single dual component
• Classes
• Coatings to be removed
• Reconciling immersion corrosion requirements
• Shelf life requirements

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

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Immersion Corrosion Requirements(courtesy of
Louise Nguyen, OC-ALC)

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

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Chemical Remover Specification Status

• Draft being written
• Shelf life test methodology determined
• Removability
• pH
• Six month retest for ONE 3 month extension
• No chemical remover older than 9 months
• Formatting references being updated
• Latest test methods equipment being researched
• viscosity
• Review of corrosion data in progress

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

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Summary

• APC Specification
• Submitted to ASC/ENOI SAE G-8
• Wipe Solvent Specification
• Publication Summer of 2005
• PMB Specification
• Draft being written
• EQP
• Draft complete
• Chemical Remover Specification
• Draft being written

• Agenda
• APC Spec
• Wipe Solvent Spec
• PMB Spec/EQP
• Chemical Remover Spec
• Summery

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Questions?

• Bill Hoogsteden [phone]
• DSN 986-4223
• General Number [phone]