Question

Pitting corrosion is dangerous in thin sections mainly because:

• A. Uniform metal thinning
• B. Formation of protective corrosion products
• C. Pits detection is difficult due to small size
• D. High cathodic overpotential

Hint:

Pitting corrosion is more dangerous than uniform corrosion because failure is sudden.

Answer 1

The Correct Option is C

Concept: Pitting corrosion is a localized form of corrosion where: \[ \text{small pits form on metal surface} \] It is dangerous because it is highly localized and not easily visible.

Step 1: Understand nature of pitting corrosion.
- Not uniform corrosion - Occurs at localized points - Leads to deep penetration

Step 2: Analyze danger in thin sections.
In thin sections: \[ \text{even small pits can cause failure} \]

Step 3: Key reason.
Main issue: \[ \text{pits are small and difficult to detect} \] Final Answer: \[ \text{Detection difficulty due to small size} \]