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===About Corrosion===
: [[Corrosion]] is commonly caused by [[Water]], [[Oxygen]] and [[Acid]]s in the environment.
: [[Metal]]s and [[stone]] (such as [[limestone]], [[marble]] and [[chalk]]) are the most commonly '''corroded''' [[material]]s.
: More [[Reactivity Series|reactive]] [[metal]]s are more easily '''corroded'''.
|[[File:CorrosionStatue.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |The [[corrosion]] of [[Iron]] forms brown [[Iron Oxide]], known as [[Rusting|rust]]. [[Rusting]] happens more quickly in humid air or in [[Brine|salty water]].| style="height:20px; width:200px; text-align:center;" |The [[corrosion]] of [[Copper]] forms green [[Copper Carbonate]]. Initially the [[Copper]] is [[Oxidised]] to form [[Copper Oxide]], a black [[solid]], but then [[Chemical Reaction|reacts]] with Carbonic Acid to form [[Copper Carbonate]].
| style="height:20px; width:200px; text-align:center;" |This statue is made of [[Limestone]] which is mostly [[Calcium Carbonate]]. It is '''corroded''' by [[Acid Rain]] to form [[soluble]] [[salt]]s which wash away.
|}
===Preventing and Reducing Corrosion===
: [[Corrosion]] can be prevented by making a physical barrier between the [[object]] and the [[chemical]]s in the environment. This can be done by painting, covering something in grease or by [[electroplating]].
{| class="wikitable"
|-
|[[File:RustingPipe.png|center|200px]]
|[[File:Electroplating.png|center|200px]]
|[[File:ChainGrease.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |This [[Iron]] pipe was painted to prevent [[corrosion]], but where the paint has chipped away, the [[Iron]] has [[rusting|rusted]].
| style="height:20px; width:200px; text-align:center;" |[[Electroplating]] can cover a [[Reactivity Series|reactive]] [[metal]] with a less [[Reactivity Series|reactive]] [[metal]] such as [[Copper]] create a physical barrier between the [[object]] and the environment.
| style="height:20px; width:200px; text-align:center;" |Grease is used on bike chains to prevent [[corrosion]]. Paint and [[electroplating]] cannot be used because they would chip away from constant movement of the chain.
|}
: [[Corrosion]] of a [[metal]] [[object]] can also be prevented using a [[Sacrificial Anode]] which is a [[metal]] more [[Reactivity Series|reactive]] [[metal]] placed in electrical contact with the [[object]]. This prevents [[Oxidation]] of the [[object]] because the more [[Reactivity Series|reactive]] [[metal]] has a greater tendency to form [[Positive Ion|positive ions]] causing it to [[Oxidation|oxidise]] instead of the [[object]].
{| class="wikitable"
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|[[File:SacrificialAnode.png|center|300px]]
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| style="height:20px; width:300px; text-align:center;" |A [[Sacrificial Anode]] made of [[Zinc]] has been attached to the [[Iron]] hull of a boat.
|}
===Preventing and Reducing References=======AQA==== :[https://www.amazon.co.uk/gp/product/0008158762/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158762&linkCode=as2&tag=nrjc-21&linkId=a0fffa35b3ea49a63404f6704e0df7cc ''Corrosion, page 338-9, GCSE Chemistry; Student Book, Collins, AQA '']:[https://www.amazon.co.uk/gp/product/1782945571/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945571&linkCode=as2&tag=nrjc-21&linkId=9e29fad914244909903e5e93f8a01d94 ''Corrosion, page 98, GCSE Chemistry; The Revision Guide, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Corrosion, pages 220-221, GCSE Chemistry; Third Edition, Oxford University Press, AQA '']:[https://www.amazon.co.uk/gp/product/1471851346/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851346&linkCode=as2&tag=nrjc-21&linkId=3ac654f4b0da781c49c855a1af4c92ea ''Corrosion, pages 258-9, GCSE Chemistry, Hodder, AQA '']:[https://www.amazon.co.uk/gp/product/1782945962/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945962&linkCode=as2&tag=nrjc-21&linkId=476bb5c8d1dfb5c08ac81b6d4d1c98d8 ''Corrosion, pages 287, 288, GCSE Chemistry, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/1471851346/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851346&linkCode=as2&tag=nrjc-21&linkId=3ac654f4b0da781c49c855a1af4c92ea ''Corrosion; prevention of, pages 259-60, GCSE Chemistry, Hodder, AQA ''] ====Edexcel==== :[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Corrosion, page 235, GCSE Combined Science, Pearson Edexcel '']:[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Corrosion, page 64, GCSE Chemistry; The Revision Guide, CGP, Edexcel '']:[https://www.amazon.co.uk/gp/product/1782948147/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948147&linkCode=as2&tag=nrjc-21&linkId=f63dcd8345f4e49c717b39a228a36c7c ''Corrosion, pages 181-183, GCSE Chemistry, CGP, Edexcel '']:[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Corrosion, pages 91, 98-99, GCSE Chemistry, Pearson, Edexcel ''] ====OCR====:[https://www.amazon.co.uk/gp/product/1782945679/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945679&linkCode=as2&tag=nrjc-21&linkId=a2db42f7b4bdf10cafaafa3bb9120940 ''Corrosion, page 79, GCSE Chemistry; The Revision Guide, CGP, OCR Gateway '']:[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Corrosion, pages 216-219, Gateway GCSE Chemistry, Oxford, OCR '']