Which of the following methods is used to prevent corrosion?
- Painting
- Electroplating
- Sacrificial electrode of another metal
- All of these
The Correct Option is D
Solution and Explanation
Correct answer: All of these
Explanation:
All the mentioned methods are effective in preventing corrosion:
- Painting: Creates a protective barrier that prevents moisture and oxygen from reaching the metal surface.
- Electroplating: Coats the metal with another metal (like chromium or zinc) to protect it from corrosion.
- Sacrificial electrode: A more reactive metal is used, which corrodes instead of the protected metal (e.g., using zinc to protect iron — called galvanization).
Hence, the correct answer is All of these.
Top Questions on Corrosion
A force of \( P = 100 \, {N} \) is applied at the ends of the pliers as shown in the figure. Neglecting friction, the force exerted by the upper jaw on the workpiece is ........... N (in integer).
- For a certain linear elastic isotropic material, the Young’s modulus is 140 GPa and the shear modulus is 50 GPa. The Poisson’s ratio for the material is ........... (rounded off to two decimal places).
Consider a beam with a square box cross-section as shown in the figure. The outer square has a length of 10 mm. The thickness of the section is 1 mm. The area moment of inertia about the x-axis is ........... mm\(^4\) (in integer).
- Using \( E^\circ \) values of X and Y given below, predict which is better for coating the surface of iron to prevent corrosion and why?
Given:
\( E^\circ_{X^{2+}/X} = -2.36 \, \text{V} \)
\( E^\circ_{Y^{2+}/Y} = -0.14 \, \text{V} \)
\( E^\circ_{Fe^{2+}/Fe} = -0.44 \, \text{V} \) - (i) Explain Corrosion. Write its two examples.
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