Eurocode 3 - Corrosion protection of individual wires

[ben]

Eurocode recommends different coating systems for each group of component in tension.
For group B, it mentions that wires coated with a Zn95A15 alloy have a much improved corrosion protection than galvanizing with zinc. What is this Zn95A15 alloy and what are its benefit over galvanizing?

[neo]

Zn95Al5 refers to a zinc–5% aluminium alloy coating. It is a metallic coating applied to high-strength steel wires, strands, and other components primarily through a hot-dip process. The alloy consists of approximately:
95% zinc
5% aluminium
Trace amounts of rare earth elements or mischmetal may also be added by some manufacturers to improve coating adhesion and processing, but the principal composition remains 95% Zn and 5% Al.
Relating to tension members (such as bridge stay cables, suspension cables, and structural tension systems), corrosion protection is critical because:
a. The wires are highly stressed.
b. Corrosion pits can rapidly reduce fatigue life.
c. Inspection and replacement are often difficult.
Zn95Al5 coatings offer several advantages over conventional hot-dip zinc galvanizing.

[ben]

Got that, thanks neo.