Name: Molar Conductivity and Kohlrausch's Law
Uploaded: 2019-07-19
Duration: 6 min 39 s
Description: Molar conductivity increases with a decrease in concentration. Let’s learn how it varies with the concentration in strong and weak electrolytes and the law g...

Question

What is corrosion? Explain its mechanism and write any two measures of its prevention.

Accepted Answer

Corrosion is defined as a natural process that causes the transformation of pure metals into undesirable substances when they react with substances like water or air. This reaction causes damage and disintegration of the metal starting from the portion of the metal exposed to the environment and spreading to the entire bulk of the metal. Rusting of iron is an example of corrosion.

Mechanism of rusting of iron: Rusting of iron which is the most commonly seen example happens when iron comes in contact with air or water. The reaction could be seen as a typical electrochemical cell reaction.

Here metal iron loses electrons and gets converted to ${Fe}^{2 +}$ . The electrons lost will move to the other side where they combine with $H^{+}$ ions. These ions are either released by $H_{2} O$ or $H_{2} {CO}_{3}$ present in the atmosphere.

$H_{2} O \to H^{+} + {OH}^{-} H_{2} {CO}_{3} \to 2 H^{+} + {CO}_{3}^{2 -}$

The Hydrogen thus formed by the reaction of $H^{+}$ and electrons react with oxygen to form $H_{2} O$ .

Two methods that are used for the prevention of corrosion are electroplating and galvanization.

What is corrosion? Explain its mechanism and write any two measures of its prevention.

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