Method used to prevent the corrosion of aluminium.

Options

A. galvanisation
B. anodising
C. tanning
D. cathodic protection

Explanation

### Step-by-Step Text Solution:

1. **Understanding Corrosion**:
- Corrosion is a chemical process where metals react with oxygen and moisture in the environment, leading to deterioration. For aluminum, this can result in the formation of aluminum oxide, which can compromise its structural integrity.

2. **Methods of Preventing Corrosion**:
- There are several methods to prevent the corrosion of aluminum, including:
- **Painting**: Applying a protective layer of paint can prevent moisture and oxygen from reaching the aluminum surface.
- **Surface Treatment**: This involves applying a coating or treatment to the aluminum surface to protect it from environmental factors.
- **Anodizing**: This is a specific electrochemical process that creates a thick oxide layer on the aluminum surface.

3. **Focusing on Anodizing**:
- Anodizing is particularly effective for aluminum. In this process, aluminum is immersed in an electrolytic solution and an electric current is passed through it. This leads to the formation of a protective oxide layer that is thicker than the natural oxide layer.
- The anodized layer is less reactive and provides excellent protection against corrosion, as it prevents further oxidation of the aluminum beneath it.

4. **Conclusion**:
- Among the methods mentioned, anodizing is the most effective and commonly used method for preventing the corrosion of aluminum. It enhances the durability and longevity of aluminum products.