Question

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Answer 1

Answer:

Corrosion is a natural process that converts a refined metal into a more chemically-stable form such as oxide, hydroxide, or sulfide. It is the gradual destruction of materials (usually a metal) by chemical and/or electrochemical reaction with their environment.

The main disadvantages of corrosion of metal are:

,Lose of metal from the surface.

,Change in the physical appearance of a metal object.

,Change in chemical properties of metal.

,Lose of the efficiency of metallic machines.

,A decrease in the life span of metallic objects.

Answer 2

Answer:

Corrosion is the decay of metal when it is exposed to the elements in the environment. Scientifically, it is the oxidation of a metal which forms a layer of metal oxide on the top layer. Advantages of corrosion It protects the top layer of the metal. Since the oxide layer is formed on the metal

Advantages of corrosion

It protects the top layer of the metal. Since the oxide layer is formed on the metal, it prevents it from further oxidation, by protecting the inner layers. It prevents the air and water from seeping into the inner layers of the metal.

sacrificial anodes like the zinc metal are used for such processes. It reacts with the oxygen in the air, to form zinc oxide. This zinc oxide acts as a protective layer and prevents the metal from further corrosion.

The process of galvanic corrosion is practised, where two metals are in contact electrically, through an electrolyte. One metal erodes preferentially, compared to another. This prevents the actual metal from being corroded

Disadvantages of Corrosion

Due to the reaction with oxygen and other elements in the environment, the purity of the metal is hampered.

 A major part of the top layer of the metal is lost, due to corrosion

It changes the physical appearance of the metal.

 It changes the chemical composition and the appearance of a metal

Reduces the life span of the metallic objects and is forced to replace it frequently

The metal loses its efficiency.

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