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Which of the following metals that usually results in a porous and volatile oxide layer?

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Which of the following metals that usually results in a porous and volatile oxide layer?

(a) Magnesium

(b) Molybdenum

(c) Sodium

(d) Magnesium, sodium, and molybdenum

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I would like to ask this question from Materials in portion Materials of Corrosion Engineering

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Right choice is (d) Magnesium, sodium, and molybdenum

Easiest explanation: If the Pilling-bed worth ratio of a particular metal is less than 1 then it results in a porous, volatile, and thin oxide layer. Sodium, molybdenum, and magnesium are examples of this kind.

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