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Which of the following type of corrosion is/are dominant due to backfills such as stones, cinders, wood, and metal?

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Which of the following type of corrosion is/are dominant due to backfills such as stones, cinders, wood, and metal?

(a) Crevice corrosion

(b) Pitting corrosion

(c) Crevice and pitting corrosion

(d) Neither crevice nor pitting corrosion

I have been asked this question in semester exam.

My enquiry is from Environments topic in section Other Environments of Corrosion Engineering

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Right answer is (c) Crevice and pitting corrosion

Easiest explanation: Crevice and pitting corrosion are the types of corrosion that dominate due to backfill such as stones, cinders, wood, and metal. Because these foreign particles result in the formation of crevices.

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