Impurities in casting is removed by________________?
Correct answer: C. Pickling
- A. Annealing
- B. Degassing
- C. Pickling
- D. Conditioning
Explanation
Pickling uses an acid solution to dissolve surface oxides and other contaminants from a casting after removal from the investment. Annealing changes the metal structure, while degassing removes absorbed gases rather than surface impurities.
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