corrosion rate — Oil & Gas Glossary
The weight loss of a corrosioncoupon after exposure to a corrosive environment, expressed as mils (thousandths of an inch) per year penetration. Corrosion rate is calculated assuming uniform corrosion over the entire surface of the coupon.mpy = (weight loss in grams) * (22,300)/(Adt)mpy = corrosion rate (mils per year penetration)A = area of coupon (sq. in.)d = metal density of
Detailed Explanation
coupon (g/cm3)t = time of exposure in corrosive environment (days).It is important to note that the calculated values using this formula are not representative in cases of severe pitting. Therefore, a complete report, including a visual inspection, is required to determine either the type of attack or the appropriate corrosion control program.Corrosion rate is also known as corrosion ratio.