Corrosion Zone Categorisation and First year Mild Steel Corrosion Rate (g/m²)
Corrosion Zone Categorisation and First year Mild Steel Corrosion Rate (g/m²)
| NZS3604 | Code of Practice | Description | MS Corrosion Rate (g/m²) |
|---|---|---|---|
| B | A (Mild) | Far inland, with no industrial pollution or thermal activity, or dry internal. This condition is not commonly found externally in New Zealand. | 1 – 10 |
| B (Moderate Inland) | Most dry rural areas in New Zealand, 50 km from the coast, are in this category. It can extend closer to the coastline of sheltered water in low rainfall areas. | 10 – 80 | |
| C | C (Moderate Marine) | This category covers area of low marine influence. It can extend from 50 km inland to within 1 – 1.5 km of west coast beaches, or be in the immediate vicinity of calm estuaries. | 80 – 200 |
| D | D (Severe Marine) | In this category, marine influences are frequently apparent. Its proximity to the coast is determined by the roughness of the water, prevailing winds, ground roughness and sheltering. | 200 – 400 |
| E (Very Severe Marine) | In this category, the structure is normally exposed and marine influences are almost constantly apparent. | 400 – 650 | |
| F (Extreme Marine) | This category is rare in a building site. It would be an exposed location very close to breaking surf. | 650 – 1 000 |
Clause Number:
4.6.1A
/cop/durability/environmental-categories#assessment-marine-environments+corrosion-zone-categorisation-and-first-year-mild-steel-corrosion-rate-gm²
- Log in to post comments