Question

For the best users. Explain What is corrosion?

Answer 1

Hey there!

Answer:

$\large{When}$ metals are exposed to atmospheric conditions, they react with air or water in the environment to form undesirable compounds ( usually oxides) is called $\textbf{corrosion}$.


Almost all $\textbf{metals except }$the least active metals such as $\textbf{gold, platinum }$are attacked by environment i.e, undergo corrosion.


$\textbf{For Example}$: Silver tarnishes, copper develop a green coating, lead or stainless steel lose their lusture due to corrosion. Corrosion causes enormous damage to buildings, $\textbf{bridges, ships}$ and many other articles made of iron.


$\large{Thus\: corrosion}$, Is a process of deterioration of a metal as a result of its reaction with air or water surrounding it.


$\textbf{\underline{Factors\: which\: affect corrosion}}$:


a) $\textbf{Presence of Co2 in water}$, increases the rusting of the iron. Water containing C$o_{2}$ acts as a electrolyte and increases the flow of electrons from one place to another place.


b) $\textbf{Presence of impurities in metals}$: The impurities help in setting up voltaic cell, which increases the speed of the corrosion.


c) $\textbf{Presence of electrolytes}$, I'm water also increases the rate of corrosion, For example, corrosion of iron in sea water takes place to larger extent than in distilled water.


d) $\textbf{Position of metal in e.m.f series}$: The reactivity of metal depends upon its position in the electrochemical series. More the reactivity of metal, the more will be the possibility of the metal getting corroded.



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Answer 2

${\Large{\textbf{\underline{\red{Answer:-}}}}}$

Corrosion is usually defined as the degradation of metals due to an electrochemical process. The formation of rust on iron, tarnish on silver, and the blue-green patina that develops on copper are all examples of corrosion.

The most common kinds of corrosion result from electrochemical reactions. General corrosion occurs when most or all of the atoms on the same metal surface are oxidized, damaging the entire surface. Most metals are easily oxidized: they tend to lose electrons to oxygen (and other substances) in the air or in water. As oxygen is reduced (gains electrons), it forms an oxide with the metal.

When reduction and oxidation take place on different kinds of metal in contact with one another, the process is called galvanic corrosion. In electrolytic corrosion, which occurs most commonly in electronic equipment, water or other moisture becomes trapped between two electrical contacts that have an electrical voltage applied between them. The result is an unintended electrolytic cell.