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Which of the following units are used in terms of penetration of pits on a metal?

Which of the following units are used in terms of penetration of pits on a metal? Correct Answer Mils per year (MPY)

Mils per year is commonly used corrosion rate expression as it measures corrosion rate in terms of depth of penetration of pit. Whereas milligram sq. decimeter per day (MDD) measures the corrosion rate in terms of weight loss of metal.

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