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Asked by SMILEY_FACE_:) to Hephzi, Imogen, Jen, Jennifer, Tom on 12 Mar 2015.
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Thomas Barrett answered on 12 Mar 2015:
So Iron rusts when it comes into contact with water and oxygen. This is because the iron oxidizes and forms Iron Oxide (the red rust). Aluminium doesn’t ‘rust’ as you think about it as the Aluminium is already coated with a layer of Aluminium Oxide meaning its already ‘rusted’ a fresh chunk of Aluminium will oxides very quickly but still be shiny like a Coke can.
Steel stays shiny as it is iron mixed with Chromium (which gives it that distinct silvery finish when people say it’s Chrome plating) and other things. The Chromium rusts first and rather than becoming manky and horrible like rust it forms an invisibly thin layer that protects the iron underneath.
For more information go here 🙂
http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway/chemical_resources/making_carsrev1.shtmlhttp://indianapublicmedia.org/amomentofscience/stainless-steel/
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Imogen Napper answered on 12 Mar 2015:
Iron rusts when it comes into contact with water and oxygen.
Both water and oxygen are needed for rusting to occur!
This is because the iron oxidises and forms iron oxide.
Iron can rust faster in salty water or acid rain.
Think about at the seaside, have you ever seen an old rusty boat?!
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