Exmets paints

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Educational powerpoint about various metal paints and coatings.

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  • Corrosion Loss (Mils)
    Severe Marine – 80 foot
    Marine
  • Mar rate – Kynar is more flexible and softer
    Polyester – SMP Harder resin
  • Exmets paints

    1. 1. Substrates and PaintsSubstrates and Paints
    2. 2. Substrates and PaintsSubstrates and Paints  Substrates  Hot Dipped Galvanized  Galvalume®  Aluminum  Paint  The importance of pre-treatments  The importance of primers  Paint systems used in our industry:  Polyesters  Siliconized Polyester  Polyvinylidene Fluoride (PVDF)
    3. 3. SubstratesSubstrates  Coated Carbon Steel  Hot Dipped Galvanized  G-90  Galvalume  AZ50  Aluminum  Alloy 3003  Temper – H14
    4. 4. Hot Dipped GalvanizedHot Dipped Galvanized  Zinc-coated carbon steel sheet that meets ASTM A653-96  Coating weight of G-90  By volume consists of a minimum thickness of .80 oz. of zinc per sq. ft. for both sides of the steel sheet  Great sacrificial advantages  No applicable corrosion warranty
    5. 5. Galvanic ProtectionGalvanic Protection  Coating is 100% zinc by volume  Hot Dipped Galvanized offers a desirable characteristic with respect to corrosion by sacrificing itself to protect slit edges and scratches  Generally has a smoother surface for paint application purposes  Superior formability
    6. 6. GalvalumeGalvalume  By volume, Galvalume contains 80% aluminum in the coating; the other 20% contains zinc and silicon additive  Aluminum/Zinc coated carbon steel sheet meets ASTM A792-96  By volume, consists of a minimum thickness of .50 oz. per sq. ft. of Zn/Al for both sides of the steel sheet
    7. 7. GalvalumeGalvalume  Coating weight – AZ50 or AZ55  Great corrosion properties  Good sacrificial advantages  20 year, 6 month warranty against corrosion
    8. 8. Galvalume vs. HD GalvanizedGalvalume vs. HD Galvanized  Hot Dipped Galvanized  After 18 years, G-90 Galvanized exhibits red rust  Galvalume  Galvalume after 23 years – no major sign of red rust Moderate Marine Rural
    9. 9. Corrosion Losses of Galvalume and Galvanized SheetsCorrosion Losses of Galvalume and Galvanized Sheets After 13 Years of ExposureAfter 13 Years of Exposure 0 0.5 1 G A LVA LU M E H .D .G A LVA N IZED RURAL INDUSTRIAL MARINE - 800 FT SEVERE MARINE - 80 FT Corrosion Loss (Mils)Corrosion Loss (Mils)
    10. 10. Salt Spray Corrosion ResistanceSalt Spray Corrosion Resistance  With cut edges protected, the coating on Galvalume AZ50 lasts 5 to 10 times longer than the coating on G90 HD Galvanized  Salt spray tests conducted with bare cut edges exposed, determined that the corrosion resistance is typically three to four times that of G90 HD Galvanized
    11. 11. Salt Spray Test Concerning the AmountSalt Spray Test Concerning the Amount of Hours to First Significant Rustof Hours to First Significant Rust 0 500 1000 1500 2000 2500 3000 Unprotected Edges Protected Edges Galvalume H.D. Galvanized Total # of Hours
    12. 12. Aluminum  Alloy 3003  Temper – H14
    13. 13. Painted ProductsPainted Products
    14. 14. What a Painted Product Consists of:What a Painted Product Consists of: Cold Rolle d Ste e l Zinc (HDG) or Zinc-Alum inum (Galvalume®) Subs trate Pre -Tre atme nt Laye r Subs trate Pre-Tre atme nt Laye r Primer (0.20 - 0.25 mils) TRINAR ® Topcoat (0.70 - 0 .90 m ils ) Primer (0.20 - 0.25 mils) Polyester Backer (0.30 - 0 .50 m ils ) Prepaint Cross-Section
    15. 15. Pre-TreatmentsPre-Treatments  A liquid used to produce a corrosion-resitant, organic bonding coating on aluminum, Galvalume, and Galvanized  An approved chromate rinse which is the major agent that allows the primer to bond to the substrate  Approved by Bethlehem Steel for the use on Galvalume
    16. 16. Pre-TreatmentsPre-Treatments  Benefits of pre-treatments Provide superior long-term corrosion protection Effective on aluminum, Galvalume and Galvanized Coating quality is consistently maintained
    17. 17. PrimerPrimer  The base layer of the paint applied by the coater  Formulated to provide corrosion protection to the base metal and to enhance adhesion between the top coat (paint) and the base metal
    18. 18. Major Components That Make Up aMajor Components That Make Up a Paint SystemPaint System  PigmentsPigments  ResinResin  SolventsSolvents  AdditivesAdditives
    19. 19. PigmentsPigments  Small solid particles added to a paint to enhance appearance by providing color and /or improve physical (functional) properties of a paint.  Pigments are protected by the resin system.
    20. 20.  Types of pigments:  Ceramic  Earth tones  Organic  Two classes of pigments:  Appearance  Functional PigmentsPigments
    21. 21. Resin SystemsResin Systems  The most important part of any paint system  The liquid “glue” of the paint system that surrounds the pigment particles, protecting them from environmental pollutants such as airborne chemicals and salt  Types of resin systems:  Polyester  Siliconized Polyester  Polyvinylidene Fluoride (PVDF)
    22. 22. SolventsSolvents  The vehicle by which the pigment is “transported” to the metal surface  Solvents evaporate during the curing process to permit the formation of a paint film
    23. 23. AdditivesAdditives  Any number of chemicals added to the paint, usually in small amounts, to bring special effects to the paint
    24. 24. Component FunctionsComponent Functions Pigment Resin Solvent Additive Aesthetics Properties Application Enhancement Color Durability Stability Mar Resistance Gloss Adhesion Viscosity Curing Agent Adhesion Flexibility Compatibility Settling Film Strength Color Retention Film Control Dispersion Water Resistance Abrasion Adhesion Anti-Freeze Corrosion Resistance Impact Resistance Leveling De-Foaming
    25. 25. Types of Paint SystemsTypes of Paint Systems  Polyester  Siliconized Polyester  Polyvinylidene Fluoride (PVDF)
    26. 26. Polyester Paint SystemsPolyester Paint Systems  A generic polymer coating with limited weathering performance  End uses: interior applications  Home appliances  Lighting fixtures  Wall panels
    27. 27. Siliconized Polyester PaintSiliconized Polyester Paint SystemsSystems  A generic coating type that represents a wide range of topcoats used on pre- painted metal in construction  The silicon extends the service life of the base polymer and improves weathering  End uses:  Metal building components  Agricultural and corrugated panels
    28. 28. Polyvinylidene Fluoride (PVDF)Polyvinylidene Fluoride (PVDF)  A fluoropolymer resin used as the major vehicle (base resin) in the paint system  Paint chemistry is 70% by weight PVDF resin  Exhibits superior:  Color retention  Chalk resistance  Corrosion resistance  Flexibility  Stain resistance  Overall exterior durability
    29. 29. PVDF CoatingsPVDF Coatings Architectural coatings thatArchitectural coatings that extend building life and keep itextend building life and keep it looking the way it was designed!looking the way it was designed!
    30. 30. How it worksHow it works  Advance molecular structural of PVDF utilizes carbon-fluorine bond – the strongest bond known in the chemical world – combined with a carbon-hydrogen bond, which creates a structure that is extremely durable
    31. 31. is the measured effect of sunlight, UV radiation, heat, and moisture on pre-painted steel
    32. 32. Paint weathering is measuredPaint weathering is measured in resistance to:in resistance to:
    33. 33. DefinitionsDefinitions  Chalk:  Residue resulting from weathering decomposition of paint films  Visual ratings are assigned according to ASTM D659; ratings range from 10- 0 (10 is best)  Fade: change in a paint film color and appearance due to degradation from weathering and UV radiation in sunlight
    34. 34. DefinitionsDefinitions  Color fade:  Expressed in calculated “delta E” values or NBS units which are measured and calculated according to ASTM D2244  Values range from 0 to infinity, where0 is best; i.e., no color change
    35. 35. PVDF CoatingsPVDF Coatings  Made with 70% PVDF resin – KYNAR® 500 or HYLAR® 5000  Exhibit excellent fabrication flexibility and weatherability  Use ceramic-inorganic pigments, which provide excellent resistance to color chalking and fading
    36. 36. Cold Rolled Steel Zinc or Zinc-Aluminum Layer Ceramic/Inorganic Topcoat Pigment PVDF Resins Surrounding Topcoat Pigment Metal Treatment 0.2-mil Primer 0.8-mil Topcoat Topcoat Layer: Protects AgainstTopcoat Layer: Protects Against UV Radiation, Heat and MoistureUV Radiation, Heat and Moisture
    37. 37. South Florida Exposure Testing EMMAQUA Exposure Testing Test Panels Mirrors
    38. 38. Why PVDF is # 1Why PVDF is # 1
    39. 39. PVDF vs. Other CoatingsPVDF vs. Other Coatings Color Change 0 5 10 15 20 25 30 0 1 2 3 4 5 6 7 8 9 10 11 Florida Exposure Time (Years) ColorChange(deltaE) SMP Polyester PVDF
    40. 40. PVDF vs. Other CoatingsPVDF vs. Other Coatings Gloss Retention 0 20 40 60 80 100 1 2 3 4 5 6 7 8 9 10 11 Florida Exposure Time (Years) GlossRetention(%) Polyester SMP PVDF
    41. 41. Weathering PropertiesWeathering Properties 0 1 2 3 4 5 Color Retention Gloss Retention Chalk Resistance Humidy Resistance Legend: 5 = Highest Performnce 1 = Lowest Performance Polyester SMP PVDF
    42. 42. Physical PropertiesPhysical Properties 0 1 2 3 4 5 Abrasion Resistance Impact Resistance Film Flexibility Hardness Mar Legend: 5 = Highest Performnce 1 = Lowest Performance Polyester SMP PVDF
    43. 43. Chemical PropertiesChemical Properties 0 1 2 3 4 5 Aids& Alkalies Oil Stain Water Immersion Legend: 5 = Highest Performnce 1 = Lowest Performance Polyester SMP PVDF
    44. 44. Superior Chalking andSuperior Chalking and Weathering ResistanceWeathering Resistance  These panels exposed at an independent test facility in Southern Florida clearly demonstrate the superior weather- ability of PVDF (left sample)
    45. 45. Elements of a PVDF WarrantyElements of a PVDF Warranty  PVDF paint warranties cover the following for 20 years:  Film integrity  Color fade  Chalk resistance  Delamination  PVDF paint warranties do not cover:  Corrosion / degradation of the substrate
    46. 46. EXCEPTIONAL MetalsEXCEPTIONAL Metals Offers Akzo Nobel Trinar coated products.Offers Akzo Nobel Trinar coated products.

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