// multi-utility computation suite · offline · instant · precise
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sci.corrosion-rate Calculator
Calculates metal corrosion rate (mm/year or mpy) from mass loss, exposed area, density, and exposure time. 1 mpy (mil per year) = 0.0254 mm/year — pipeline steel with corrosion rate above 5 mpy requires corrosion inhibition or cathodic protection.
Inputs
Mass Loss Mg
Total mass (kg). Distinct from weight — weight = mass × gravity. Mass is constant; weight varies with location.
Area Cm2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Time Hours
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Density G Cm3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Results
corrosion rate (mm/yr)
The value at the specified point or condition.
corrosion rate (mpy)
The value at the specified point or condition.
service life estimate (yrs)
The value at the specified point or condition.
MPY = (weight loss × 534) / (density × area × time)
The computed weight (gravitational force) or mass.
NACE rating
A standardised quality or risk rating on the applicable scale.