The best pickling solution for gypsum bonded investment is_______________?
Correct answer: A. Hydrochloric acid
- A. Hydrochloric acid
- B. Nitric acid
- C. Sulphuric acid
- D. Phosphoric acid
Explanation
Hydrochloric acid is used as a pickling solution for castings made with gypsum-bonded investment, helping remove adherent investment and surface contaminants. The choice of acid depends on the investment and alloy being treated.
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