Table 1.
The corrosion rate of steel and zinc with respect to corrosivity categories (EN ISO 9223) [4].
| Category | Corrosion Risk | Corrosion Rate Rcorr for the First Year of Exposure | |||
|---|---|---|---|---|---|
| Low-Carbon Steel | Zinc | ||||
| Mass Loss (G/M2) | Thickness Loss (µm) | Mass Loss (G/M2) | Thickness Loss (µm) | ||
| C1 | Very low | ≤10 | ≤1.3 | ≤0.7 | ≤0.1 |
| C2 | Low | >10 to ≤200 | >1.3 to ≤25 | >0.7 to ≤5 | >0.1 to ≤0.7 |
| C3 | Medium | >200 to ≤400 | >25 to ≤50 | >5 to ≤15 | >0.7 to ≤2.1 |
| C4 | High | >400 to ≤650 | >50 to ≤80 | >15 to ≤30 | >2.1 to ≤4.2 |
| C5 | Very high | >650 to ≤1500 | >80 to ≤200 | >30 to ≤60 | >4.2 to ≤8.4 |
| CX | Extreme | >1500 to ≤5500 | >200 to ≤700 | >60 to ≤80 | >8.4 to ≤25 |