Trivalent Thick Film Passivation
Following the zinc plating process the thickness deposited in conjunction with a clear-iridescent thick film.
Trivalent passivation can be used for many applications subject to individual requirements and service conditions. Typical Specification used but not limited to BS EN ISO 2081 : 2008 (E)
Protection Values
1
—
Fe
/
Zn
/
5
C
- Service Condition No.
- Fe = Iron/Steel
- Zn = Zinc
- 5 = Zinc Thickness
- C = Passivation Type (thick film)
Coating Designation
Service Condition
Neutral Salt Spray Test
(duration in hours)
1 — Fe/Zn/5C
Indoors
(in warm dry atmospheres)
72
2 — Fe/Zn/8C
Indoors
(where condensation may occur)
120
3 — Fe/Zn/12C
Indoors
(in temperate conditions)
192
4 — Fe/Zn/25C
Outdoors
(in severe corrosive conditions)
360
