Which of the following is not suggested to prevent metals from corrosion ?

Options

A. Dipping metal in salt solution
B. Painting
C. Greasing
D. Electroplating

Explanation

To determine which of the following methods is not suggested to prevent metals from corrosion, we can analyze the various methods typically used for corrosion prevention:

1. **Understanding Corrosion**: Corrosion is the process where metals react with environmental factors like oxygen and moisture, leading to deterioration. This can affect the metal's appearance and strength.

2. **Common Methods to Prevent Corrosion**:
- **Galvanization**: This involves coating the metal (usually iron) with a layer of zinc. Zinc acts as a sacrificial anode, preventing the underlying metal from corroding.
- **Electroplating**: This method involves depositing a layer of another metal (like chromium) onto the surface of the metal to provide protection.
- **Painting**: Applying paint creates a barrier that protects the metal from exposure to moisture and oxygen.
- **Greasing**: Similar to painting, greasing provides a protective layer that prevents moisture from reaching the metal surface.

3. **Identifying the Incorrect Method**:
- The question asks for a method that is **not** suggested for preventing corrosion. The transcript mentions that dipping the metal in salt solution is not an effective method for preventing corrosion.

4. **Conclusion**: Based on the analysis, the method that is not suggested to prevent metals from corrosion is **dipping the metal in salt solution**.

### Final Answer:
The method that is not suggested to prevent metals from corrosion is **dipping the metal in salt solution**.