Calculate coupon corrosion in mm/year, micrometers/year, and mpy, reverse expected mass loss, or estimate uniform-corrosion life from remaining thickness.

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Corrosion Rate Formula

The following formula is used to calculate the Corrosion Rate.

CR (mm yr⁻¹) = 87.6 × W / (D × A × t)
  • W = metal weight loss (mg)
  • D = metal density (g cm⁻³)
  • A = exposed area (cm²)
  • t = exposure time (h)

How to Calculate Corrosion Rate?

The following two example problems outline the steps and information needed to calculate the Corrosion Rate.

Example Problem #1

  1. First, determine the metal weight loss (mg).
    • The metal weight loss (mg) is calculated to be: 50.
  2. Next, determine the metal density (g/cm³).
    • The metal density (g/cm³) is measured to be: 10.
  3. Next, determine the exposed area of the sample (cm²).
    • The exposed area of the sample (cm²) is found to be: 3.
  4. Next, determine the exposure time (h).
    • This is given as 265 hours.
  5. Finally, calculate the corrosion rate using the formula above:

CR = 87.6 × W / (D × A × t)

The values provided above are inserted into the equation below and computed.

CR = 87.6 × 50 / (10 × 3 × 265) = 0.5510 (mm/year)

Example Problem #2

The variables required for this problem are provided below:

metal weight loss (mg) = 60

metal density (g/cm³) = 4

area of sample (cm²) = 5

time (hours) = 200

Test your knowledge using the equation and check your answer with the calculator.

CR = 87.6 × W / (D × A × t) = (mm/year)