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 MM Y on corrosion?

In metric expression one mil equals to 0.0254 mm. The corrosion rate can be also calculated in MMY, means Millimeter per year. In an open water system a corrosion rate of around 1 MPY is normal. Having corrosion rate of around 10, you should take action.

What is MPY unit?

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 corrosion rate?

The corrosion rate in mpy is 0.897.

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 are the units of corrosion rate?

WS is the mass of species S that has reacted. In cases where the corrosion occurs uniformly across a metal’s surface, you can calculate the corrosion rate in units of distance per year….Corrosion Rate Constants.

Units for Corrosion Rate K Units
mm/year 3272 mm/(A cm year)
µm/year 3.272 ×106 µm/(A cm year)

How do you calculate mm corrosion per year?

Corrosion rate is best expressed in terms of thickness or weight loss where the surface of the metal corrodes uniformly across the area that has been exposed. It is found by: R = d/t expressed in µm/y but can also be expressed in terms of: Weight loss g/m2.