Enter the metal weight loss (mg), the metal density (g/mm^3), the total time (years), and the area of the sample (mm^2) into the Corrosion Rate Calculator. The calculator will evaluate the Corrosion Rate. 

Corrosion Rate Formula

The following formula is used to calculate the Corrosion Rate. 

COR = W / (D*A*T)
  • Where COR is the Corrosion Rate (mm/year)
  • W is the metal weight loss (mg) 
  • D is the metal density (g/mm^3) 
  • A is the area of the sample (mm^2) 
  • T is the total time (years)

To calculate the corrosion rate, divide the metal weight loss by the product of the density, area, and total time.

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/mm^3).
    • The metal density (g/mm^3) is measured to be: 10.
  3. Next, determine the area of sample (mm^2).
    • The area of sample (mm^2) is found to be: 3.
  4. Next, determine the total time in years.
    • This is given as 3 years.
  5. Finally, calculate the Corrosion Rate using the formula above: 

COR = W / (D*A*T)

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

COR = 50 / (10*3*3) = .55 (mm/year)

Example Problem #2

The variables required for this problem are provided below:

metal weight loss (mg) = 60

metal density (g/mm^3) = 4

area of sample (mm^2) = 5

time (years) = 2

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

COR = W / (D*A*T) = (mm/year)