Uniform corrosion rate in mm/year from coupon weight loss - the standard NACE/ASTM G1 calculation used for cargo-tank and ballast-tank monitoring.
Formula
$$ \text{CR} = \frac{87600 \cdot \Delta m}{A \cdot t \cdot \rho} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $\Delta m$ | Mass loss | g | lab weighing |
| $A$ | Exposed surface | cm² | coupon geometry |
| $\rho$ | Metal density | g/cm³ | material |
Sources
- ASTM G1 / NACE SP0775.