The table below shows the lifespan of galvanized coatings in different environments, based on their thickness. This information can be used to choose the right coating thickness for your specific needs.
Most of the Indian location fall under High and Very High Corrosion Level
| Corrosion Level | Zinc coating thickness in micron vs Lifespan in Years (approx) | ||||||
|---|---|---|---|---|---|---|---|
| 45 µm | 55 µm | 70 µm | 85 µm | 115 µm | 165 µm | 215 µm | |
| Very Low | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Low | 64-100 | 78-100 | 100 | 100 | 100 | 100 | 100 |
| Middle | 21-64 | 26-78 | 33-100 | 40-100 | 55-100 | 78-100 | 100 |
| High | 11-21 | 13-26 | 17-33 | 20-40 | 27-55 | 39-78 | 39-100 |
| Very High | 5-11 | 6-13 | 8-17 | 10-19 | 14-27 | 20-39 | 25-51 |
Environmental factors #
Here is a table that explains different corrosion levels.
| Corrosion Level | Details | Example Areas |
|---|---|---|
| Very Low | Clean atmospheres | Interior: Office, shops, school, etc., |
| Low | Low humidity | Outdoor & Semi Closed like Depots, sports hall, etc., |
| Middle | High humidity & some air pollution: | Urban and industrial atmospheres: food-processing plants, laundries, breweries and dairies. |
| High | Permanent condensation & moderate salinity | Farms, Chemical plants, swimming pools, coastal ship & boatyards |
| Very High | Permanent condensation & high salinity | Coastal & offshore areas with high salinity |
Note: In summary, the factors that determine the expected product life expectancy of galvanized coatings are zinc coating thickness, air quality, water quality, and sand exposure. Environmental conditions and pollution should be considered when determining the amount of zinc coating (microns) needed for hot dip galvanizing. reference data are based on American Galvanizers Association.
