Thursday, 17 November 2016

Fast Rust Task - W5T4

Fast Rust Task - With Alfa

Walt: Synthesize information from multiple resources.

Work on this Doc together with a partner.

What 3 ingredients are needed for rust to occur.

Write a brief paragraph explaining the rusting process (why rusting occurs)
Oxygen from the air mixes with water. The iron surface of the nail reacts with the oxygen mixed in the water. It forms iron oxide. Iron oxide reacts with the water. It forms hydrated iron oxide - red stuff we call rust. This process continues until all the iron is eaten up.Screenshot 2016-11-08 at 9.31.44 AM.png

How could you prevent something from rusting?
Use paint and alloys (mixes of metals). Another way of avoiding rust is using spray-on wax or oil coatings that the car companies sell. One alloy that could be used is stainless steel, which helps the the iron to last longer (rusts slower). Keep iron away from water and oxygen. Another way is by galvanising. This means to coat Zinc over iron and only the zinc will be affected but you can easily wash it of. You could also use a coating of paint to stop water from getting into cracks to stop or to slow down the rusting process.

Write 3 sentences explaining something new you’ve learned from this reading.
We learnt that oxygen, air and water is what causes things to rust. Also we didn’t know that rust could be prevented by painting over the metal, using spray-on wax or oil coatings. All iron objects can be rusted if they are exposed by oxygen and water including trains, bikes (chains), skateboards (wheel bearings), house roof and many other things. One interesting fact that we found out was that the harbour bridge has the biggest paint job to prevent it from rusting.

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