The process of forming a thick layer of aluminium oxide on the surface of aluminium so as to protect it from corrosion is called :

Correct option is B

The correct answer is: (b) Anodising

Explanation:

• Anodising is an electrochemical process in which a protective layer of aluminium oxide is formed on the surface of aluminium to protect it from corrosion.

• This layer is thicker and more durable than the natural oxide layer that forms on aluminium when exposed to air.

• Anodising is commonly used to protect aluminium used in harsh environments, such as in construction and aerospace industries.

Information Booster:

• Galvanising (Incorrect): This process involves coating iron or steel with a layer of zinc to protect it from corrosion, not aluminium.

• Roasting (Incorrect): Roasting is the process of heating ores in the presence of oxygen to extract metal, not related to the protection of aluminium.

• Calcination (Incorrect): Calcination is the process of heating a substance to a high temperature in the absence of air, typically to drive off volatile substances, not related to aluminium protection.