Question

In which metals corrosion is useful?

Answer 1

Corrosion:

• Corrosion is a natural process that transforms refined metals into more chemically stable oxides.
• It is the progressive decomposition of materials as a result of chemical or electrochemical reactions with their surroundings.
• Corrosion is beneficial in metals such as Aluminium($\mathrm{Al}$) and Copper($\mathrm{Cu}$).
• In the case of these two metals, corrosion shields the metal beneath the corroded layer.
• Also, corrosion helps to prevent any further reaction of the pure metal with any other substance.
• For example, the inert Aluminium oxide(${\mathrm{Al}}_2{\mathrm{O}}_3$) formed as the result of corrosion will stick with the metal surface and form a preventive coating. This will avoid further corrosion of metal.