What are the essential requirements for corrosion to take place?
Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM
1. The metal needs to be in contact with an electrolyte.
2. The presence of dissolved substances in the electrolyte is necessary. These substances can be dissolved gases such as oxygen, chlorine or bromine gases or dissolved ions such as H+(hydrogen ion) all of which serve as strong corrosive agents. Pure distilled water with no dissolved substances will not function as an electrolyte and metals subjected to it will not corrode.
3. The presence of a corrosion cell whereby two portions of the metal surfaces become electrically connected via an electrolyte, salt bridge etc. A portion of the metal surface then becomes anodic (corrodes) giving up metal ions and another portion becomes cathodic, gaining metal ions.
Answered by | 4th Jun, 2014, 03:23: PM
- What is Corrosion? Do we observe corrosion only in Iron?
- 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.
- 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.
- 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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