How is MPY calculated?

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 coupon (g/cm3) t = time of exposure in corrosive environment (days).

What is the unit of corrosion rate?

The corrosion current in amperes. A constant that defines the units for the corrosion rate….Corrosion Rate Constants.

What is MDD unit?

The Corrosion Rate is frequently reported as Milligrams Per Square Decimeter Per Day (mdd). The Penetration Rate is the average depth of metal loss. The most common unit for Penetration Rate used in the USA is Mils Per Year (mpy). A mil is equivalent to 1/1000 inch.

How do you determine the MPY of a material from a corrosion test?

The corrosion rate can be calculated from this using the relationship: 1 mpy = (1/n ) J where n is the valence of the metal involved (M –> Mn+ + ne-).

What is the meaning of MM Y in corrosion?

Mils penetration per year (MPY) is a unit of measurement equal to one thousandth of an inch. Mils penetration per year is commonly known as mil in the U.S. measurement system. Mils penetration per year is used to gauge a coupon’s corrosion rate. This unit may also be used to measure a coating’s thickness or tolerance.

What is MPY in corrosion rate?

Mils per Year – MPY – Corrosion Rate Mils per year or MPY is used to give the corrosion rate in a pipe, a pipe system or other metallic surfaces. It is used to calculate the material loss or weight loss of a metal surfaces. Even if the name indicates a distance is measured.

What is mil in corrosion?

What is a mil definition?

Definition of mil (Entry 1 of 3) 1 : thousand found a salinity of 38.4 per mil. 2 : a monetary unit formerly used in Cyprus equal to ¹/₁₀₀₀ pound. 3 : a unit of length equal to ¹/₁₀₀₀ inch used especially in measuring thickness (as of plastic films)

What is GMD in corrosion?

gram per m2 per day: gmd, milligram per dm2 per day: mdd.