Clear Trivalent Passivation
Following the Zinc plating process the thickness deposited in conjunction with a clear thin 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
A
- Service Condition No.
- Fe = Iron/Steel
- Zn = Zinc
- 5 = Zinc Thickness
- A = Passivation Type (thin film)
Coating Designation
Service Condition
Neutral Salt Spray Test
(duration in hours)
0 — Fe/Zn/5A
Purely Cosmetic
48
1 — Fe/Zn/8A
Indoors
(in warm dry atmospheres)
27
2 — Fe/Zn/12A
Indoors
(where condensation may occur)
120
3 — Fe/Zn/25A
Indoors
(in temperate conditions)
192
4 — No Category
Outdoors
(in severe corrosive conditions)
Thick Film
Trivalent Passivation type (C)
