Question:
The microstructure is revealed by the following surface treatment process, using an appropriate chemical reagent
The microstructure is revealed by the following surface treatment process, using an appropriate chemical reagent
Show Hint
Etching is essential because microstructure is revealed only by differential corrosion.
Updated On: Jun 29, 2026
- Polishing
- Grinding
- Buffing
- Etching
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept:
In metallography, the microstructure of a material cannot be observed directly on a mirror-polished surface. It must be revealed using selective chemical attack, known as etching.
Etching highlights grain boundaries and different phases by differential chemical reactivity.
Step 1: Purpose of surface preparation.
Before etching:
• grinding removes surface irregularities
• polishing produces a smooth mirror-like finish
• buffing improves surface smoothness further However, none of these reveal microstructure.
Step 2: Role of etching.
Etching:
• attacks different phases at different rates
• reveals grain boundaries
• makes microstructural features visible under microscope
Step 3: Why others are incorrect.
• Grinding → only leveling
• Polishing → smooth surface only
• Buffing → final finishing step None of these expose microstructure. Final Answer: \[ \boxed{\text{Etching}} \]
Step 1: Purpose of surface preparation.
Before etching:
• grinding removes surface irregularities
• polishing produces a smooth mirror-like finish
• buffing improves surface smoothness further However, none of these reveal microstructure.
Step 2: Role of etching.
Etching:
• attacks different phases at different rates
• reveals grain boundaries
• makes microstructural features visible under microscope
Step 3: Why others are incorrect.
• Grinding → only leveling
• Polishing → smooth surface only
• Buffing → final finishing step None of these expose microstructure. Final Answer: \[ \boxed{\text{Etching}} \]
Was this answer helpful?
0
0
Top TS PGECET Metallurgical Engineering Questions
- “It is impossible for a heat engine to be 100% efficient.” This statement is related to:
- If a system is completely ordered and the atoms are at rest at zero Kelvin, then the entropy of the system is:
- Electrodes used in anodizing process are:
- Units for quantity of electricity are:
- Identify the wrong statement:
View More Questions
Top TS PGECET Crystal Structures Questions
- Ratio of packing factor of an FCC crystal to the packing factor of a simple cubic crystal is:
- In the Mond process, nickel reacts with carbon monoxide to form:
- The sets of planes which can appear in an FCC diffraction pattern is
- In an X-ray diffraction pattern, reflections from a BCC crystal will appear only when
- Which of the following represents octahedral interstitial site in an FCC lattice?
View More Questions
Top TS PGECET Questions
- If \( P = \begin{pmatrix} 1 & 1 & 1 \\ 0 & 1 & 2 \\ 0 & 0 & 1 \end{pmatrix} \) is the modal matrix of \( A = \begin{pmatrix} 1 & 1 & 0 \\ 0 & 2 & 2 \\ 0 & 0 & 3 \end{pmatrix} \) then the sum of all the elements of \( P^{-1}AP \) is
- If the system of equations \( kx + y + z = k - 1 \), \( x + ky + z = k - 1 \), and \( x + y + kz = k - 1 \) has infinite solutions, then \( k \) is
- The value of the integral \( \int_C (2xy - x^2) \, dx + (x^2 + y^2) \, dy \) where \( C \) is the boundary of the region enclosed by \( y = x^2 \) and \( y^2 = x \), described in the positive sense, is
- Let \( f(x) = \log x \). The number \( C \) strictly between \( e^2 \) and \( e^3 \) such that its reciprocal is equal to \( \frac{f(e^3) - f(e^2)}{e^3 - e^2} \) is
- The solution of the differential equation \( (D^2 + 2)y = x^2 \) is
View More Questions