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Comparitive Study of Commercially Available Rust Converters

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This is a presentation that I gave at the 2011 AIC annual convention in the Architecture Specialty Group.

This is a presentation that I gave at the 2011 AIC annual convention in the Architecture Specialty Group.

Published in: Technology, Business

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  • 1. Comparative Study of Commercially Available Rust Converters
    Jason Church, Anna Muto, and Mary F. Striegel
    National Center for Preservation Technology and Training
    AIC ASG 2011
  • 2. What are Rust Convertors?
  • 3. Why this Study?
  • 4. Why this Study?
    “Corrosion Protection of Outdoor Iron Artifacts Using Commercial Rust Converters”
    Canadian Conservation Institute 1995
  • 5. Test Criteria
    Product must be a rust “Convertor”
    Commercially available
    Easily obtainable
    Designed for outdoor environment
    Picked highest selling product from each of the 4 main acid types
  • 6. 4 Main Acid Types
    “Ospho” = Phosphoric Acid
    “Rust-oleum Rust Reformer” = Tannic Acid
    “Corroseal” = Gallic Acid
    “RCx427” = Oxalic Acid
    “CCI Recipe” = Tannic + Phosphoric Acids
  • 7. Samples
    Sheer cut
    3”x6”x1/16” coupons
    A36 Carbon Steel
    Naturally weathered
  • 8.
  • 9.
  • 10. Before and at every 250 hours OUV
    Color Measurements Taken
    Coating Thickness Measured
    Gloss Measured
    Laser Profilometery Scan
    FTIR Analysis of Surface
    Photographed
  • 11. Minolta CR-400 Colorimeter
  • 12. PhisherDeltascopeFMP 30
  • 13.
  • 14. BYK GardnerMirco-TRIGlossmeter
  • 15.
  • 16. SolariusLaserscan
    Corroseal Sample after Treatment
    Corroseal Sample after 1032 Hrs QUV
  • 17. FTIR
  • 18. Photographed
  • 19. Ospho by Skybright
  • 20. Ospho by Skybright
  • 21. Rust Reformer by Rust-oleum
  • 22. Rust Reformer by Rust-oleum
  • 23. Corroseal by Rodda Paint Company
  • 24. Corroseal by Rodda Paint Company
  • 25. RCx427 by Enviro-Safe Services
  • 26. RCx427 by Enviro-Safe Services
  • 27. CCI = 10% Tannic Acid + 10%Phosphoric Acid +
  • 28. CCI Recipe
  • 29. Conclusion
    Rust-oleum Rust Reformer
    • Gave most stable surface after 1032 hours
    • 30. Least amount of staining and color change
  • Continuation
    Analysis FTIR to help understand surface interaction
    Push Reformer to failure
    Outdoor accelerated weathering tests
  • 31. Like to thank;
    Anna Muto
    Mary F. Striegel
    Curtis Desselles
    Charlotte Eng