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Which of the following materials are commonly used as flux in the casting process to prevent oxidation?

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in Casting-Forming-Welding II by (119k points)
Which of the following materials are commonly used as flux in the casting process to prevent oxidation?

(a) Sodium silicate

(b) Lead

(c) Sodium chloride

(d) Sodium carbonate

This question was posed to me during an interview.

This intriguing question comes from Foundry Fluxes and Refractories topic in chapter Foundry Introduction & Materials of Casting-Forming-Welding II

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The correct option is (c) Sodium chloride

To elaborate: Sodium chloride is commonly used as flux in the casting process to prevent oxidation. Sometimes potassium fluoride is also preferred as a flux due to its excellent volatility. It not only prevents the oxidation, the other inclusions are also reduced by using flux. This process avoids metal wastage and avoids several defects formation.

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