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The flux used in the foundries to make castings of magnesium alloys are ________

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The flux used in the foundries to make castings of magnesium alloys are ________

(a) Potassium Chloride

(b) Barium Chloride

(c) Magnesium Oxide

(d) Potassium Chloride, Barium Chloride and Magnesium Oxide

This question was posed to me during an online exam.

The query is from Raw Materials for Foundry topic in section Foundry Introduction of Foundry and Forging

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Right choice is (d) Potassium Chloride, Barium Chloride and Magnesium Oxide

The explanation is: The fluxes are used for melting magnesium alloys prevent the burning of magnesium alloys. The fluxes listed above have excellent properties as fluxes in foundries. Nitrogen (gaseous flux) is used to bubble slowly through the molten magnesium for removing hydrogen.

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