What's the difference between hot-dip galvanized steel strands and electro-galvanized steel strands, and which one should be chosen for power projects?

The main differences between the two are in zinc layer thickness, adhesion, and corrosion resistance lifespan, making them suitable for completely different scenarios.

Zinc Layer and Lifespan

Hot-dip galvanized zinc layer is 30~60μm, with a coating amount ≥250g/㎡, forming a zinc-iron alloy layer, with a corrosion resistance lifespan of 15~30 years. Electro-galvanized zinc layer is only 5~15μm, has weak adhesion, and will rust outdoors in 5-8 years.

Appearance and Performance

Electro-galvanized surfaces are shiny and smooth, but they can peel or suffer hydrogen brittleness when bent. Hot-dip galvanized surfaces have a natural zinc pattern, are tough, vibration-resistant, and scratch-resistant.

Selection Advice

For power overhead ground wires, communication guy wires, bridge rigging, or outdoor projects in salty or coastal areas, you must choose hot-dip galvanized steel strands. Electro-galvanized products can only be used for short-term indoor temporary fixes.