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Which of the following is also known as under film corrosion?

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Which of the following is also known as under film corrosion?

(a) Crevice corrosion

(b) Filiform corrosion

(c) Galvanic corrosion

(d) Pitting corrosion

I got this question during an interview.

The origin of the question is Eight Forms in portion Eight Forms of Corrosion of Corrosion Engineering

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Best answer
Right choice is (b) Filiform corrosion

The explanation is: Filiform corrosion is a special type of crevice corrosion. It is also known as under film corrosion as it occurred under protective coatings or films.  It usually seen on food and beverage cans.

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