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Which of the following is/are the primary causes of atmospheric corrosion?

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Which of the following is/are the primary causes of atmospheric corrosion?

(a) Moisture

(b) Oxygen

(c) Moisture, oxygen and sulfur contaminants

(d) Sulfur contaminants only

I have been asked this question in an interview for job.

The doubt is from Environments topic in division Other Environments of Corrosion Engineering

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The correct option is (c) Moisture, oxygen and sulfur contaminants

For explanation: The primary causes of atmospheric corrosion is moisture, oxygen and sulfur contaminants. Absence of either moisture or oxygen in at least form will result in no corrosion.

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