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Which of the following metals/alloys passivates spontaneously in acid solutions containing oxidizers or dissolved oxygen?

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Which of the following metals/alloys passivates spontaneously in acid solutions containing oxidizers or dissolved oxygen?

(a) Copper

(b) Titanium

(c) Stainless steels and titanium

(d) Nickel

I had been asked this question in exam.

The origin of the question is Modern Theory Principles in chapter Modern Theory Principles of Corrosion Engineering

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Correct option is (b) Titanium

Best explanation: Stainless steels and titanium passivates spontaneously in acid solutions containing oxidizers or dissolved oxygen. A decrease in passive potential and critical current density is the driving force for the spontaneous passivation.

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