Useful information for clients and metallizers to determine the thicknesses of zinc needed for various types of environment.
The following table indicates the useful life of the coating before the appearance of the 5% of rust on the metal surface:
| YEARS OF USEFUL LIFE | thicknesses | |||
| environment | 50 µ | 75 µ | 90 µ | 100 µ |
| rural | 70 | 100 | > 100 | > 100 |
| urban | 50 | 75 | 83 | 87 |
| marino | 40 | 67 | 73 | 83 |
| marine tropical | 90 | 60 | 68 | 78 |
| industrial | 38 | 57 | 65 | 72 |
The following table shows the thicknesses obtainable with the different types of zinc protection:
| protection type | coating thickness in microns |
| electric arc galvanizing | 83 – 210 |
| zincatura a caldo | 35 – 99 |
| paints rich in zinc | 15 – 127 |
A general rule wants that the higher the thickness of Zinc, the longer the useful life of the steel. About this, electric arc spray galvanizing is preferred.
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