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What is the condition for mold metal reaction to take place?

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in Casting-Forming-Welding I by (687k points)
What is the condition for mold metal reaction to take place?

(a) Radiating contact between gas and metal

(b) Direct contact between gas and metal

(c) Radiating contact between gas and oxide film

(d) Direct contact between gas and oxide film

I had been asked this question during an internship interview.

My question is taken from Mold-Metal Reaction topic in portion Mold and Mold Making of Casting-Forming-Welding I

1 Answer

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Correct answer is (b) Direct contact between gas and metal

The explanation: For mold – metal reaction to take place, the condition is that there has to be direct contact between the gas and the metal.

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