Cleaning of base metal alloy is done by______________?
Correct answer: D. Sand blasting with aluminium oxide
- A. Warm HCI
- B. Cold HF
- C. Cold H2SO4
- D. Sand blasting with aluminium oxide
Explanation
Cast base-metal alloys are commonly cleaned by sandblasting with aluminium oxide, which removes investment remnants and surface oxides mechanically. Strong acids such as hydrofluoric acid are hazardous and are not the routine choice for this cleaning step.
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