Dear Dr. Ghaidaa Alsarraj ,

To calculate the corrosion rate from metal loss, use:

MM / Y = 87.6 x (W / DAT)

where:

W = weight loss in milligrams

D = metal density in g /cm3

A = area of the sample in cm2

T = time of exposure of the metal sample in hours

To convert the corrosion rate between the mils per year (MPY) and the metric equivalent millimeter per year (MM/Y), you can use the following equation to convert mils per year to micrometers per year (MicroM/Y):

1 MPY = 0.0254 MM / Y = 25.4 MicroM / Y

For more details, please see the source:

- How to Calculate the Rate of Metal Corrosion by ThoughtCo,

Available at: https://www.thoughtco.com/corrosion-rate-calculator-2339697

My best regards, Pierluigi Traverso.

Dear Dr. Ghaidaa Alsarraj ,

I suggest you to have a lool also at the following, interesting paper:

- The empirical prediction of weight change and corrosion rate of low-carbon steel

Nurdin Ali, Mohamad Ali Fulazzaky

Heliyon, Volume 6, Issue 9, September 2020, e05050

Available at: https://www.sciencedirect.com/science/article/pii/S2405844020318934

My best regards, Pierluigi Traverso.

As I know, the best way to calculate the corrosion rate is the experimental method. Produce some cubic specimens and polish them. Measure the specimens' weight. Immerse them into a standard corrosive solution. Measure the specimens' weight after the corrosion process and draw the graph of the Mass loss versus the corrosion time. But, I've found the following equation by searching:

Rcorr (mm/yr) = 87.6 x (W/DAT)

mm = milimeter

yr = year

W = weight loss in milligrams

D = metal density in g/cm3

A = area of the specimen in cm2

T = time of exposure of the metal sample in hours

To convert the corrosion rate between the mils per year (MPY) and the metric equivalent millimeter per year (mm/Y), you can use the following equation to convert mils per year to micrometers per year (Micro m/Y):

1 MPY = 0.0254 mm/y = 25.4 Micro m/Y

Good luck