Iron does not rust even if the zinc metal coating on its surface is broken but the same is not true when coating is of Tin.
Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM
This can be explained from the position of these three elements in the electrochemical series. In comparison to Iron, Tin has lower reactivity than Iron where as Zinc is more reactive than Iron. When the coating of Zinc on the surface of Iron is broken even then Zinc will corrode in preference to Iron metal, whereas when coating of tin on Iron is cracked it exposes both the metals to external oxidizing conditions under this condition, Iron will oxidize in preference to Tin metal.
Answered by | 4th Jun, 2014, 03:23: PM
- What is Corrosion? Do we observe corrosion only in Iron?
- What are the essential requirements for corrosion to take place?
- Account for the following: "Alkaline medium inhibits the rusting of iron".
- Give three easier ways of preventing rusting of Iron.
- Why carbon dioxide dissolved in water increases the rate of rusting?
- Oxygen is essential for rusting. But a portion of iron rod in contact with oxygen is not damaged rather the other end is damaged. Explain why?
- Rusting of iron becomes quicker in saline medium. Explain.
- What is meant by Cathodic protection of the Iron? Explain it taking the example of Magnesium attached to an Iron tank or pipe.
- How des galvanization of Iron Prevents its rusting?
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