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Which of the following metal doesn’t follow linear oxidation law?

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Which of the following metal doesn’t follow linear oxidation law?

(a) Sodium

(b) Aluminum

(c) Niobium

(d) Potassium

I got this question by my college professor while I was bunking the class.

Question is from High-Temperature Corrosion in portion High Temperature Corrosion of Corrosion Engineering

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The correct choice is (b) Aluminum

To explain: Linear oxidation law states that an increase in weight per unit area of metal is directly proportional to the time of exposure. Metals such as sodium, potassium, tantalum, and niobium follow linear oxidation law whereas aluminum follows the logarithmic oxidation law.

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