Our galvanisation plants specialise in the hot-dip galvanisation of steel in accordance with NEN-EN-ISO 1461. To check whether the requirements of this standard have been met, it is possible to conduct an inspection after hot-dip galvanising that focuses primarily on:
The thickness of the zinc coating determines the duration of protection. In general: the thicker the zinc coating, the longer the expected life of the product!
The thicknesses are always related to the wall thickness of the product being treated. NEN-EN-ISO 1461 defines local and mean coating thicknesses as follows:
Coating thickness measurements are always conducted using the only non-destructive method, the "magnetic method" as defined in NEN-EN-ISO 2178.
This table lists the minimum local mean coating thicknesses required by NEN-EN-ISO-1461.
Articles Thickness article |
Local coating thickness in micrometres (μm) |
Mean coating thickness in micrometres (μm) |
---|---|---|
Steel > 6mm | 70 | 85 |
Steel > 3mm tot ≤ 6mm | 55 | 70 |
Steel ≥ 1,5mm tot ≤ 3mm | 45 | 55 |
Steel < 1,5mm | 35 | 45 |
Cast items ≥ 6mm | 70 | 80 |
Cast items < 6mm | 60 | 70 |
This table lists the minimum local mean coating thicknesses required by NEN-EN-ISO 1461 for centrifugally galvanised objects.
Article with threading | Local coating thickness in micrometres (μm) |
Mean coating thickness in micrometres (μm) |
---|---|---|
> 6mm tot ≤ 20mm | 40 | 50 |
≤ 6mm middellijn | 20 | 25 |
Other objects (including cast items) |
||
> 3mm | 45 | 55 |
< 3mm | 35 | 45 |
The second requirement relates to the appearance of the coating. NEN-EN-ISO 1461 has the following to say in this respect:
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