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When should the first maintenance take place ?
As per the ISO 9223 standard, the lifetime of a zinc coating before the first maintenance is :
- corrosion class C1:
- for 100 µm of zinc: > 200 years,
- for a duplex system: not applicable,
- corrosion class C2:
- for 100 µm of zinc: > 100 years,
- for a duplex system: not applicable,
- corrosion class C3:
- for 100 µm of zinc: 50-100 years,
- for a duplex system: not applicable,
- corrosion class C4:
- for 100 µm of zinc: 25-50 years,
- for a duplex system: 45-90 years,
- corrosion class C5:
- for 100 µm of zinc: 13-26 years,
- for a duplex system: 23-47 years,
- corrosion class CX:
- for 100 µm of zinc: 4-13 years,
- for a duplex system: 7-23 years.
*Indicative time before the occurrence of 5% of rust.
Values are longer for zinc-aluminium.
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