| What exactly is Corrosion? | -Corrosion is just when something is Damaged or even Destroyed by Chemicals. |
| Which Metal can only Rust? How can this Happen? | -Rusting can only happen to Iron
-Rusting happens when Iron is in Contact with Oxygen and Water, which will make Hydrated Iron [III] Oxide |
| Show the Equation for the Making of Rust? [Remember Hydrated Iron [III] is a Form of Rust] | Iron + Oxygen + Water --> Hydrated Iron [III] Oxide |
| Why is Rusting Iron a Redox Reaction? | -Iron will lose 3 Electrons, when it Reacts with Oxygen, to become an Ion with a 3+ Charge. This is Oxidation
-Oxygen will gain 2 Electrons, when it Reacts with Iron, to become an Ion with a 2- Charge. This is Reduction
-And a Redox Reaction is when both Oxidation and Reduction is Present. |
| How does Oil, Grease and Paint slow down Corrosion? | -If you Coat the Metal with a Barrier, the Reactants [Oxygen and Water] will be Unable to hit the Metal
-Painting is good for Big and Small Structures - and it looks Cool
-Oiling and Greasing is used for Moving Things, like Bike Chains and Door Parts. |
| How can Coating Steal with Tin slow down Corrosion? | -Tin Plating is just when Tin Covers the Object
-The Tin will be a Barrier, stopping Water and Oxygen hit the Metal
-This will ONLY work if the Tin does not Reveal any part of the Metal. If it does, then it'll Corrode. |
| What exactly is the Sacrificial Method in terms of Corrosion? | -Placing a more Reactive Metal with the other Metal that you won't want to Corrode will work because:
-The Reactive Metal will react with the Water and Oxygen, instead of the other Metal.
-Example may be with Magnesium being Bolted onto Lesser Reactive Metals; since Magnesium wants to lose its Electrons more than the other Metal, it will React with the Oxygen and Water
-This is seen in Ship Hulls, or Underground Pipes |
| What is Galvanising? | -This is when ZINC is used to Cover an Iron Object to stop Rusting
-Zinc is acting as a Sacrificial Protection, as its more Reactive than Iron and it also acts like a Barrier. Effective
-Steel Buckets and Corrugated Iron Roofing are Galvanised |
