why do we paint steel

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why do we paint steel

  1. 1. Paint TechnologyIP Indonesia – May 2006 Updated November 2005
  2. 2. DisclaimerWe have taken reasonable care in preparing this training material (“the Material”) and incollecting and preparing material for inclusion in it but do not represent or warrant that it is freefrom error or that the information content is complete or accurate. The information is advisoryonly and the use of the Material is solely at your own risk.In the event that the Material contains print-outs of presentations, please note that the Materialdoes not necessarily stand on its own and is not intended to be relied upon in specificcircumstances.It is your responsibility to be aware of relevant current national, state and international laws andregulations that affect or may affect your activities or operations. The Material is not intended toprovide comprehensive coverage of such laws and regulations.To the extent permitted by law, we do not accept any liability to any person for any loss ordamage (direct or indirect) that may arise from any use of or reliance on any of the methods orinformation contained in the Material for any purpose.If you wish, you may take copies of the Material for your own use but all copies must carry thisimportant notice.© Akzo Nobel, 2005. All rights reserved
  3. 3. IntroductionWhy do we paint steel? Updated November 2005
  4. 4. Why do we need to paint steel? By far the single most importantreason is to protect a huge financialinvestment by means of CorrosionPrevention. Ships, factories, oil refineries etccost millions of dollars to build – wecan not just let them rust away.
  5. 5. Corrosion Prevention Ballast Tank
  6. 6. Corrosion Prevention Deck of an FPSO
  7. 7. Corrosion PreventionA serious corrosion problem!
  8. 8. Corrosion Prevention Serious Metal Loss
  9. 9. Corrosion PreventionPotentially catastrophic breakdown
  10. 10. Corrosion Prevention Could it get worse?
  11. 11. Corrosion Prevention Could it get worse?
  12. 12. What is CorrosionCorrosion is basically:-“The attack on metals by their environment.”We normally see it as steel changing to rust.Nature is simply returning steel from an unstable man-made state to a stable natural state.
  13. 13. Corrosion STEEL Iron Metal Chemically Unstable Structural HEAT CORROSION (By Man) (By Nature) Chemically the same! IRON ORE RUST Iron Oxide Iron OxideChemically Stable Chemically Stable Non-Structural Non-Structural
  14. 14. Corrosion • Steel corrodes… • Rust is weak… • Rust is porous… • Rust detaches from the steel… • Rust does not prevent more corrosion……..…SO WHY USE STEEL?
  15. 15. Why use Steel?• Iron ore is very widely available.• It is easy to make steel from iron ore• Steel is strong relative to its weight• STEEL IS CHEAP!!!!!
  16. 16. Corrosion Prevention
  17. 17. Why do we need to paint steel?1) Corrosion Prevention2) Fouling Control (Marine uses only)
  18. 18. Fouling control
  19. 19. Fouling controlEnteromorpha (Green) Ectocarpus (Brown)
  20. 20. Fouling control Acorn Barnacles
  21. 21. Fouling
  22. 22. Fouling
  23. 23. FoulingShoreline animals released as tiny larvae:- • Hydroids - can swim for just a few hours • Barnacles - can swim for up to 6 weeks…if they do not find a surface to colonise in thattime they die.
  24. 24. Fouling
  25. 25. Fouling
  26. 26. Fouling
  27. 27. Fouling
  28. 28. Why do we use Antifoulings?We are used to the idea of fast moving items having to be streamlined to go smoothly through air
  29. 29. Why do we use Antifoulings?……but the same principles apply for ships passing through water – albeit at much slower speed.
  30. 30. Why do we use Antifoulings?Drag on ships comes from roughness due to corrosion & fouling! Although a barnacle seems very small compared to a ship, if there are enough of them, it will greatly increase fuel costs.. BECOMES
  31. 31. Fouling controlShell Fouling: Up to 40% increase in drag
  32. 32. The Fouling Challenge POLAR• Temperature TEMPERATE• Pollution TROPICAL/SUBTROPICAL• Nutrients EXTREME FOULING ENVIRONMENT
  33. 33. Fouling Control
  34. 34. Why do we need to paint steel?1) Corrosion Prevention2) Fouling Control3) Cosmetic Appearance
  35. 35. Cosmetic Appearance
  36. 36. Cosmetic Appearance
  37. 37. Cosmetic Appearance
  38. 38. Cosmetic appearance
  39. 39. Cosmetic appearance
  40. 40. Why do we need to paint steel?1) Corrosion Prevention2) Fouling Control3) Cosmetic Appearance4) Cargo Storage / Carriage
  41. 41. Cargo Storage / Carriage The wrong chemical with the wrong coating can be a disaster.
  42. 42. Cargo Storage (PC)
  43. 43. Cargo Carriage (Marine)
  44. 44. Marine vs PC• We do not use the same coatings for both Marine & PC tanks.• PC Tanks hold one chemical for many years.• Marine Tanks hold cargoes for short periods and then have to be able to carry a totally different cargo.
  45. 45. Why do we need to paint steel?1) Corrosion Prevention2) Fouling Control3) Cosmetic Appearance4) Cargo Storage / Carriage5) Abrasion Resistance
  46. 46. Abrasion Resistance
  47. 47. Abrasion Resistance
  48. 48. Abrasion Resistance Typically CAREFUL loading of a cargo to prevent damage to the coating!
  49. 49. Abrasion Resistance Typical cargo hold damage from hard cargoes such as Iron Ore & Coal.
  50. 50. Abrasion Resistance Heavy Fender Damage
  51. 51. Abrasion Resistance
  52. 52. Abrasion Resistance Ice abrasion removes all coating from outer hull
  53. 53. Abrasion Resistance An ice-breaker hull protected by a special anti-abrasion coating.
  54. 54. Why do we need to paint steel?1) Corrosion Prevention2) Fouling Control3) Cosmetic Appearance4) Cargo Storage / Carriage5) Abrasion Resistance6) Skid Prevention
  55. 55. Skid PreventionWould you like to be working on this deck?
  56. 56. Skid PreventionGood grip is essential to land a plane on a deck
  57. 57. Why do we need to paint steel?1) Corrosion Prevention2) Fouling Control3) Cosmetic Appearance4) Cargo Storage5) Abrasion Resistance6) Skid Prevention7) Fire Protection8) Radar Absorption9) Heat Resistance10) Low Solar Absorption
  58. 58. Fire Protection
  59. 59. Radar Absorption• Some navies require special coatings for above-water areas to make them ‘invisible’ to radar.• These are very specific types of coatings for each navy and developed in great secrecy.
  60. 60. Heat Resistance Engine Room -Main Engines
  61. 61. Heat Resistance Engine Room showing pipes protected by special heat resistant paint
  62. 62. Low Solar Absorption (LSA) Coatings
  63. 63. Low Solar Absorption (LSA) Coatings
  64. 64. IntroductionWhy do we paint steel?

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