Weight loss experemint for carbon steel Explain why the corr

Weight loss experemint for carbon steel..

Explain why the corrosion rate expressed in penetration rate is more useful than that expressed in the rate of metal loss per unit area.

Solution

Weight loss per unit area was commonly used in earlier times,mainly because weight loss was usually the directly determined quantity in corrosion testing. Here the test specimens were weighed before and after the exposure to the corrosion medium. On this basis one could calculate the thickness reduction as weight loss per unit area/density. where as penetration rate is expressed per unit time