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Colour of inox steel surface upon heating

  1. Dec 10, 2011 #1
    If you heat inox steel in presence of air, up to a specific temperature, you get a yellow colour of the metal surface; increasing the temperature it becomes red; still increasing, blue.
    Is it due to the formation of oxide layers of different thickness? Which effect is responsible of the colour?
     
  2. jcsd
  3. Dec 10, 2011 #2

    Astronuc

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    Staff: Mentor

    Thickness (number of layers) of the oxide is the key factor. Different thicknesses produce different scattering or interference.

    http://www.bssa.org.uk/topics.php?article=140

    http://www.tpub.com/steelworker1/11.htm
     
  4. Dec 10, 2011 #3
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